/*
 Copyright 2012 Igor Vaynberg

 Version: 3.4.5 Timestamp: Mon Nov  4 08:22:42 PST 2013

 This software is licensed under the Apache License, Version 2.0 (the "Apache License") or the GNU
 General Public License version 2 (the "GPL License"). You may choose either license to govern your
 use of this software only upon the condition that you accept all of the terms of either the Apache
 License or the GPL License.

 You may obtain a copy of the Apache License and the GPL License at:

 http://www.apache.org/licenses/LICENSE-2.0
 http://www.gnu.org/licenses/gpl-2.0.html

 Unless required by applicable law or agreed to in writing, software distributed under the
 Apache License or the GPL Licesnse is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
 CONDITIONS OF ANY KIND, either express or implied. See the Apache License and the GPL License for
 the specific language governing permissions and limitations under the Apache License and the GPL License.
 */
(function ($) {
	if (typeof $.fn.each2 == "undefined") {
		$.extend($.fn, {
			/*
			 * 4-10 times faster .each replacement
			 * use it carefully, as it overrides jQuery context of element on each iteration
			 */
			each2: function (c) {
				var j = $([0]), i = -1, l = this.length;
				while (
					++i < l
						&& (j.context = j[0] = this[i])
						&& c.call(j[0], i, j) !== false //"this"=DOM, i=index, j=jQuery object
					);
				return this;
			}
		});
	}
})(jQuery);

(function ($, undefined) {
	"use strict";
	/*global document, window, jQuery, console */

	if (window.Select2 !== undefined) {
		return;
	}

	var KEY, AbstractSelect2, SingleSelect2, MultiSelect2, nextUid, sizer,
		lastMousePosition = {x: 0, y: 0}, $document, scrollBarDimensions,

		KEY = {
			TAB: 9,
			ENTER: 13,
			ESC: 27,
			SPACE: 32,
			LEFT: 37,
			UP: 38,
			RIGHT: 39,
			DOWN: 40,
			SHIFT: 16,
			CTRL: 17,
			ALT: 18,
			PAGE_UP: 33,
			PAGE_DOWN: 34,
			HOME: 36,
			END: 35,
			BACKSPACE: 8,
			DELETE: 46,
			isArrow: function (k) {
				k = k.which ? k.which : k;
				switch (k) {
					case KEY.LEFT:
					case KEY.RIGHT:
					case KEY.UP:
					case KEY.DOWN:
						return true;
				}
				return false;
			},
			isControl: function (e) {
				var k = e.which;
				switch (k) {
					case KEY.SHIFT:
					case KEY.CTRL:
					case KEY.ALT:
						return true;
				}

				if (e.metaKey) return true;

				return false;
			},
			isFunctionKey: function (k) {
				k = k.which ? k.which : k;
				return k >= 112 && k <= 123;
			}
		},
		MEASURE_SCROLLBAR_TEMPLATE = "<div class='select2-measure-scrollbar'></div>",

		DIACRITICS = {"\u24B6": "A", "\uFF21": "A", "\u00C0": "A", "\u00C1": "A", "\u00C2": "A", "\u1EA6": "A", "\u1EA4": "A", "\u1EAA": "A", "\u1EA8": "A", "\u00C3": "A", "\u0100": "A", "\u0102": "A", "\u1EB0": "A", "\u1EAE": "A", "\u1EB4": "A", "\u1EB2": "A", "\u0226": "A", "\u01E0": "A", "\u00C4": "A", "\u01DE": "A", "\u1EA2": "A", "\u00C5": "A", "\u01FA": "A", "\u01CD": "A", "\u0200": "A", "\u0202": "A", "\u1EA0": "A", "\u1EAC": "A", "\u1EB6": "A", "\u1E00": "A", "\u0104": "A", "\u023A": "A", "\u2C6F": "A", "\uA732": "AA", "\u00C6": "AE", "\u01FC": "AE", "\u01E2": "AE", "\uA734": "AO", "\uA736": "AU", "\uA738": "AV", "\uA73A": "AV", "\uA73C": "AY", "\u24B7": "B", "\uFF22": "B", "\u1E02": "B", "\u1E04": "B", "\u1E06": "B", "\u0243": "B", "\u0182": "B", "\u0181": "B", "\u24B8": "C", "\uFF23": "C", "\u0106": "C", "\u0108": "C", "\u010A": "C", "\u010C": "C", "\u00C7": "C", "\u1E08": "C", "\u0187": "C", "\u023B": "C", "\uA73E": "C", "\u24B9": "D", "\uFF24": "D", "\u1E0A": "D", "\u010E": "D", "\u1E0C": "D", "\u1E10": "D", "\u1E12": "D", "\u1E0E": "D", "\u0110": "D", "\u018B": "D", "\u018A": "D", "\u0189": "D", "\uA779": "D", "\u01F1": "DZ", "\u01C4": "DZ", "\u01F2": "Dz", "\u01C5": "Dz", "\u24BA": "E", "\uFF25": "E", "\u00C8": "E", "\u00C9": "E", "\u00CA": "E", "\u1EC0": "E", "\u1EBE": "E", "\u1EC4": "E", "\u1EC2": "E", "\u1EBC": "E", "\u0112": "E", "\u1E14": "E", "\u1E16": "E", "\u0114": "E", "\u0116": "E", "\u00CB": "E", "\u1EBA": "E", "\u011A": "E", "\u0204": "E", "\u0206": "E", "\u1EB8": "E", "\u1EC6": "E", "\u0228": "E", "\u1E1C": "E", "\u0118": "E", "\u1E18": "E", "\u1E1A": "E", "\u0190": "E", "\u018E": "E", "\u24BB": "F", "\uFF26": "F", "\u1E1E": "F", "\u0191": "F", "\uA77B": "F", "\u24BC": "G", "\uFF27": "G", "\u01F4": "G", "\u011C": "G", "\u1E20": "G", "\u011E": "G", "\u0120": "G", "\u01E6": "G", "\u0122": "G", "\u01E4": "G", "\u0193": "G", "\uA7A0": "G", "\uA77D": "G", "\uA77E": "G", "\u24BD": "H", "\uFF28": "H", "\u0124": "H", "\u1E22": "H", "\u1E26": "H", "\u021E": "H", "\u1E24": "H", "\u1E28": "H", "\u1E2A": "H", "\u0126": "H", "\u2C67": "H", "\u2C75": "H", "\uA78D": "H", "\u24BE": "I", "\uFF29": "I", "\u00CC": "I", "\u00CD": "I", "\u00CE": "I", "\u0128": "I", "\u012A": "I", "\u012C": "I", "\u0130": "I", "\u00CF": "I", "\u1E2E": "I", "\u1EC8": "I", "\u01CF": "I", "\u0208": "I", "\u020A": "I", "\u1ECA": "I", "\u012E": "I", "\u1E2C": "I", "\u0197": "I", "\u24BF": "J", "\uFF2A": "J", "\u0134": "J", "\u0248": "J", "\u24C0": "K", "\uFF2B": "K", "\u1E30": "K", "\u01E8": "K", "\u1E32": "K", "\u0136": "K", "\u1E34": "K", "\u0198": "K", "\u2C69": "K", "\uA740": "K", "\uA742": "K", "\uA744": "K", "\uA7A2": "K", "\u24C1": "L", "\uFF2C": "L", "\u013F": "L", "\u0139": "L", "\u013D": "L", "\u1E36": "L", "\u1E38": "L", "\u013B": "L", "\u1E3C": "L", "\u1E3A": "L", "\u0141": "L", "\u023D": "L", "\u2C62": "L", "\u2C60": "L", "\uA748": "L", "\uA746": "L", "\uA780": "L", "\u01C7": "LJ", "\u01C8": "Lj", "\u24C2": "M", "\uFF2D": "M", "\u1E3E": "M", "\u1E40": "M", "\u1E42": "M", "\u2C6E": "M", "\u019C": "M", "\u24C3": "N", "\uFF2E": "N", "\u01F8": "N", "\u0143": "N", "\u00D1": "N", "\u1E44": "N", "\u0147": "N", "\u1E46": "N", "\u0145": "N", "\u1E4A": "N", "\u1E48": "N", "\u0220": "N", "\u019D": "N", "\uA790": "N", "\uA7A4": "N", "\u01CA": "NJ", "\u01CB": "Nj", "\u24C4": "O", "\uFF2F": "O", "\u00D2": "O", "\u00D3": "O", "\u00D4": "O", "\u1ED2": "O", "\u1ED0": "O", "\u1ED6": "O", "\u1ED4": "O", "\u00D5": "O", "\u1E4C": "O", "\u022C": "O", "\u1E4E": "O", "\u014C": "O", "\u1E50": "O", "\u1E52": "O", "\u014E": "O", "\u022E": "O", "\u0230": "O", "\u00D6": "O", "\u022A": "O", "\u1ECE": "O", "\u0150": "O", "\u01D1": "O", "\u020C": "O", "\u020E": "O", "\u01A0": "O", "\u1EDC": "O", "\u1EDA": "O", "\u1EE0": "O", "\u1EDE": "O", "\u1EE2": "O", "\u1ECC": "O", "\u1ED8": "O", "\u01EA": "O", "\u01EC": "O", "\u00D8": "O", "\u01FE": "O", "\u0186": "O", "\u019F": "O", "\uA74A": "O", "\uA74C": "O", "\u01A2": "OI", "\uA74E": "OO", "\u0222": "OU", "\u24C5": "P", "\uFF30": "P", "\u1E54": "P", "\u1E56": "P", "\u01A4": "P", "\u2C63": "P", "\uA750": "P", "\uA752": "P", "\uA754": "P", "\u24C6": "Q", "\uFF31": "Q", "\uA756": "Q", "\uA758": "Q", "\u024A": "Q", "\u24C7": "R", "\uFF32": "R", "\u0154": "R", "\u1E58": "R", "\u0158": "R", "\u0210": "R", "\u0212": "R", "\u1E5A": "R", "\u1E5C": "R", "\u0156": "R", "\u1E5E": "R", "\u024C": "R", "\u2C64": "R", "\uA75A": "R", "\uA7A6": "R", "\uA782": "R", "\u24C8": "S", "\uFF33": "S", "\u1E9E": "S", "\u015A": "S", "\u1E64": "S", "\u015C": "S", "\u1E60": "S", "\u0160": "S", "\u1E66": "S", "\u1E62": "S", "\u1E68": "S", "\u0218": "S", "\u015E": "S", "\u2C7E": "S", "\uA7A8": "S", "\uA784": "S", "\u24C9": "T", "\uFF34": "T", "\u1E6A": "T", "\u0164": "T", "\u1E6C": "T", "\u021A": "T", "\u0162": "T", "\u1E70": "T", "\u1E6E": "T", "\u0166": "T", "\u01AC": "T", "\u01AE": "T", "\u023E": "T", "\uA786": "T", "\uA728": "TZ", "\u24CA": "U", "\uFF35": "U", "\u00D9": "U", "\u00DA": "U", "\u00DB": "U", "\u0168": "U", "\u1E78": "U", "\u016A": "U", "\u1E7A": "U", "\u016C": "U", "\u00DC": "U", "\u01DB": "U", "\u01D7": "U", "\u01D5": "U", "\u01D9": "U", "\u1EE6": "U", "\u016E": "U", "\u0170": "U", "\u01D3": "U", "\u0214": "U", "\u0216": "U", "\u01AF": "U", "\u1EEA": "U", "\u1EE8": "U", "\u1EEE": "U", "\u1EEC": "U", "\u1EF0": "U", "\u1EE4": "U", "\u1E72": "U", "\u0172": "U", "\u1E76": "U", "\u1E74": "U", "\u0244": "U", "\u24CB": "V", "\uFF36": "V", "\u1E7C": "V", "\u1E7E": "V", "\u01B2": "V", "\uA75E": "V", "\u0245": "V", "\uA760": "VY", "\u24CC": "W", "\uFF37": "W", "\u1E80": "W", "\u1E82": "W", "\u0174": "W", "\u1E86": "W", "\u1E84": "W", "\u1E88": "W", "\u2C72": "W", "\u24CD": "X", "\uFF38": "X", "\u1E8A": "X", "\u1E8C": "X", "\u24CE": "Y", "\uFF39": "Y", "\u1EF2": "Y", "\u00DD": "Y", "\u0176": "Y", "\u1EF8": "Y", "\u0232": "Y", "\u1E8E": "Y", "\u0178": "Y", "\u1EF6": "Y", "\u1EF4": "Y", "\u01B3": "Y", "\u024E": "Y", "\u1EFE": "Y", "\u24CF": "Z", "\uFF3A": "Z", "\u0179": "Z", "\u1E90": "Z", "\u017B": "Z", "\u017D": "Z", "\u1E92": "Z", "\u1E94": "Z", "\u01B5": "Z", "\u0224": "Z", "\u2C7F": "Z", "\u2C6B": "Z", "\uA762": "Z", "\u24D0": "a", "\uFF41": "a", "\u1E9A": "a", "\u00E0": "a", "\u00E1": "a", "\u00E2": "a", "\u1EA7": "a", "\u1EA5": "a", "\u1EAB": "a", "\u1EA9": "a", "\u00E3": "a", "\u0101": "a", "\u0103": "a", "\u1EB1": "a", "\u1EAF": "a", "\u1EB5": "a", "\u1EB3": "a", "\u0227": "a", "\u01E1": "a", "\u00E4": "a", "\u01DF": "a", "\u1EA3": "a", "\u00E5": "a", "\u01FB": "a", "\u01CE": "a", "\u0201": "a", "\u0203": "a", "\u1EA1": "a", "\u1EAD": "a", "\u1EB7": "a", "\u1E01": "a", "\u0105": "a", "\u2C65": "a", "\u0250": "a", "\uA733": "aa", "\u00E6": "ae", "\u01FD": "ae", "\u01E3": "ae", "\uA735": "ao", "\uA737": "au", "\uA739": "av", "\uA73B": "av", "\uA73D": "ay", "\u24D1": "b", "\uFF42": "b", "\u1E03": "b", "\u1E05": "b", "\u1E07": "b", "\u0180": "b", "\u0183": "b", "\u0253": "b", "\u24D2": "c", "\uFF43": "c", "\u0107": "c", "\u0109": "c", "\u010B": "c", "\u010D": "c", "\u00E7": "c", "\u1E09": "c", "\u0188": "c", "\u023C": "c", "\uA73F": "c", "\u2184": "c", "\u24D3": "d", "\uFF44": "d", "\u1E0B": "d", "\u010F": "d", "\u1E0D": "d", "\u1E11": "d", "\u1E13": "d", "\u1E0F": "d", "\u0111": "d", "\u018C": "d", "\u0256": "d", "\u0257": "d", "\uA77A": "d", "\u01F3": "dz", "\u01C6": "dz", "\u24D4": "e", "\uFF45": "e", "\u00E8": "e", "\u00E9": "e", "\u00EA": "e", "\u1EC1": "e", "\u1EBF": "e", "\u1EC5": "e", "\u1EC3": "e", "\u1EBD": "e", "\u0113": "e", "\u1E15": "e", "\u1E17": "e", "\u0115": "e", "\u0117": "e", "\u00EB": "e", "\u1EBB": "e", "\u011B": "e", "\u0205": "e", "\u0207": "e", "\u1EB9": "e", "\u1EC7": "e", "\u0229": "e", "\u1E1D": "e", "\u0119": "e", "\u1E19": "e", "\u1E1B": "e", "\u0247": "e", "\u025B": "e", "\u01DD": "e", "\u24D5": "f", "\uFF46": "f", "\u1E1F": "f", "\u0192": "f", "\uA77C": "f", "\u24D6": "g", "\uFF47": "g", "\u01F5": "g", "\u011D": "g", "\u1E21": "g", "\u011F": "g", "\u0121": "g", "\u01E7": "g", "\u0123": "g", "\u01E5": "g", "\u0260": "g", "\uA7A1": "g", "\u1D79": "g", "\uA77F": "g", "\u24D7": "h", "\uFF48": "h", "\u0125": "h", "\u1E23": "h", "\u1E27": "h", "\u021F": "h", "\u1E25": "h", "\u1E29": "h", "\u1E2B": "h", "\u1E96": "h", "\u0127": "h", "\u2C68": "h", "\u2C76": "h", "\u0265": "h", "\u0195": "hv", "\u24D8": "i", "\uFF49": "i", "\u00EC": "i", "\u00ED": "i", "\u00EE": "i", "\u0129": "i", "\u012B": "i", "\u012D": "i", "\u00EF": "i", "\u1E2F": "i", "\u1EC9": "i", "\u01D0": "i", "\u0209": "i", "\u020B": "i", "\u1ECB": "i", "\u012F": "i", "\u1E2D": "i", "\u0268": "i", "\u0131": "i", "\u24D9": "j", "\uFF4A": "j", "\u0135": "j", "\u01F0": "j", "\u0249": "j", "\u24DA": "k", "\uFF4B": "k", "\u1E31": "k", "\u01E9": "k", "\u1E33": "k", "\u0137": "k", "\u1E35": "k", "\u0199": "k", "\u2C6A": "k", "\uA741": "k", "\uA743": "k", "\uA745": "k", "\uA7A3": "k", "\u24DB": "l", "\uFF4C": "l", "\u0140": "l", "\u013A": "l", "\u013E": "l", "\u1E37": "l", "\u1E39": "l", "\u013C": "l", "\u1E3D": "l", "\u1E3B": "l", "\u017F": "l", "\u0142": "l", "\u019A": "l", "\u026B": "l", "\u2C61": "l", "\uA749": "l", "\uA781": "l", "\uA747": "l", "\u01C9": "lj", "\u24DC": "m", "\uFF4D": "m", "\u1E3F": "m", "\u1E41": "m", "\u1E43": "m", "\u0271": "m", "\u026F": "m", "\u24DD": "n", "\uFF4E": "n", "\u01F9": "n", "\u0144": "n", "\u00F1": "n", "\u1E45": "n", "\u0148": "n", "\u1E47": "n", "\u0146": "n", "\u1E4B": "n", "\u1E49": "n", "\u019E": "n", "\u0272": "n", "\u0149": "n", "\uA791": "n", "\uA7A5": "n", "\u01CC": "nj", "\u24DE": "o", "\uFF4F": "o", "\u00F2": "o", "\u00F3": "o", "\u00F4": "o", "\u1ED3": "o", "\u1ED1": "o", "\u1ED7": "o", "\u1ED5": "o", "\u00F5": "o", "\u1E4D": "o", "\u022D": "o", "\u1E4F": "o", "\u014D": "o", "\u1E51": "o", "\u1E53": "o", "\u014F": "o", "\u022F": "o", "\u0231": "o", "\u00F6": "o", "\u022B": "o", "\u1ECF": "o", "\u0151": "o", "\u01D2": "o", "\u020D": "o", "\u020F": "o", "\u01A1": "o", "\u1EDD": "o", "\u1EDB": "o", "\u1EE1": "o", "\u1EDF": "o", "\u1EE3": "o", "\u1ECD": "o", "\u1ED9": "o", "\u01EB": "o", "\u01ED": "o", "\u00F8": "o", "\u01FF": "o", "\u0254": "o", "\uA74B": "o", "\uA74D": "o", "\u0275": "o", "\u01A3": "oi", "\u0223": "ou", "\uA74F": "oo", "\u24DF": "p", "\uFF50": "p", "\u1E55": "p", "\u1E57": "p", "\u01A5": "p", "\u1D7D": "p", "\uA751": "p", "\uA753": "p", "\uA755": "p", "\u24E0": "q", "\uFF51": "q", "\u024B": "q", "\uA757": "q", "\uA759": "q", "\u24E1": "r", "\uFF52": "r", "\u0155": "r", "\u1E59": "r", "\u0159": "r", "\u0211": "r", "\u0213": "r", "\u1E5B": "r", "\u1E5D": "r", "\u0157": "r", "\u1E5F": "r", "\u024D": "r", "\u027D": "r", "\uA75B": "r", "\uA7A7": "r", "\uA783": "r", "\u24E2": "s", "\uFF53": "s", "\u00DF": "s", "\u015B": "s", "\u1E65": "s", "\u015D": "s", "\u1E61": "s", "\u0161": "s", "\u1E67": "s", "\u1E63": "s", "\u1E69": "s", "\u0219": "s", "\u015F": "s", "\u023F": "s", "\uA7A9": "s", "\uA785": "s", "\u1E9B": "s", "\u24E3": "t", "\uFF54": "t", "\u1E6B": "t", "\u1E97": "t", "\u0165": "t", "\u1E6D": "t", "\u021B": "t", "\u0163": "t", "\u1E71": "t", "\u1E6F": "t", "\u0167": "t", "\u01AD": "t", "\u0288": "t", "\u2C66": "t", "\uA787": "t", "\uA729": "tz", "\u24E4": "u", "\uFF55": "u", "\u00F9": "u", "\u00FA": "u", "\u00FB": "u", "\u0169": "u", "\u1E79": "u", "\u016B": "u", "\u1E7B": "u", "\u016D": "u", "\u00FC": "u", "\u01DC": "u", "\u01D8": "u", "\u01D6": "u", "\u01DA": "u", "\u1EE7": "u", "\u016F": "u", "\u0171": "u", "\u01D4": "u", "\u0215": "u", "\u0217": "u", "\u01B0": "u", "\u1EEB": "u", "\u1EE9": "u", "\u1EEF": "u", "\u1EED": "u", "\u1EF1": "u", "\u1EE5": "u", "\u1E73": "u", "\u0173": "u", "\u1E77": "u", "\u1E75": "u", "\u0289": "u", "\u24E5": "v", "\uFF56": "v", "\u1E7D": "v", "\u1E7F": "v", "\u028B": "v", "\uA75F": "v", "\u028C": "v", "\uA761": "vy", "\u24E6": "w", "\uFF57": "w", "\u1E81": "w", "\u1E83": "w", "\u0175": "w", "\u1E87": "w", "\u1E85": "w", "\u1E98": "w", "\u1E89": "w", "\u2C73": "w", "\u24E7": "x", "\uFF58": "x", "\u1E8B": "x", "\u1E8D": "x", "\u24E8": "y", "\uFF59": "y", "\u1EF3": "y", "\u00FD": "y", "\u0177": "y", "\u1EF9": "y", "\u0233": "y", "\u1E8F": "y", "\u00FF": "y", "\u1EF7": "y", "\u1E99": "y", "\u1EF5": "y", "\u01B4": "y", "\u024F": "y", "\u1EFF": "y", "\u24E9": "z", "\uFF5A": "z", "\u017A": "z", "\u1E91": "z", "\u017C": "z", "\u017E": "z", "\u1E93": "z", "\u1E95": "z", "\u01B6": "z", "\u0225": "z", "\u0240": "z", "\u2C6C": "z", "\uA763": "z"};

	$document = $(document);

	nextUid = (function () {
		var counter = 1;
		return function () {
			return counter++;
		};
	}());


	function stripDiacritics(str) {
		var ret, i, l, c;

		if (!str || str.length < 1) return str;

		ret = "";
		for (i = 0, l = str.length; i < l; i++) {
			c = str.charAt(i);
			ret += DIACRITICS[c] || c;
		}
		return ret;
	}

	function indexOf(value, array) {
		var i = 0, l = array.length;
		for (; i < l; i = i + 1) {
			if (equal(value, array[i])) return i;
		}
		return -1;
	}

	function measureScrollbar() {
		var $template = $(MEASURE_SCROLLBAR_TEMPLATE);
		$template.appendTo('body');

		var dim = {
			width: $template.width() - $template[0].clientWidth,
			height: $template.height() - $template[0].clientHeight
		};
		$template.remove();

		return dim;
	}

	/**
	 * Compares equality of a and b
	 * @param a
	 * @param b
	 */
	function equal(a, b) {
		if (a === b) return true;
		if (a === undefined || b === undefined) return false;
		if (a === null || b === null) return false;
		// Check whether 'a' or 'b' is a string (primitive or object).
		// The concatenation of an empty string (+'') converts its argument to a string's primitive.
		if (a.constructor === String) return a + '' === b + ''; // a+'' - in case 'a' is a String object
		if (b.constructor === String) return b + '' === a + ''; // b+'' - in case 'b' is a String object
		return false;
	}

	/**
	 * Splits the string into an array of values, trimming each value. An empty array is returned for nulls or empty
	 * strings
	 * @param string
	 * @param separator
	 */
	function splitVal(string, separator) {
		var val, i, l;
		if (string === null || string.length < 1) return [];
		val = string.split(separator);
		for (i = 0, l = val.length; i < l; i = i + 1) val[i] = $.trim(val[i]);
		return val;
	}

	function getSideBorderPadding(element) {
		return element.outerWidth(false) - element.width();
	}

	function installKeyUpChangeEvent(element) {
		var key = "keyup-change-value";
		element.on("keydown", function () {
			if ($.data(element, key) === undefined) {
				$.data(element, key, element.val());
			}
		});
		element.on("keyup", function () {
			var val = $.data(element, key);
			if (val !== undefined && element.val() !== val) {
				$.removeData(element, key);
				element.trigger("keyup-change");
			}
		});
	}

	$document.on("mousemove", function (e) {
		lastMousePosition.x = e.pageX;
		lastMousePosition.y = e.pageY;
	});

	/**
	 * filters mouse events so an event is fired only if the mouse moved.
	 *
	 * filters out mouse events that occur when mouse is stationary but
	 * the elements under the pointer are scrolled.
	 */
	function installFilteredMouseMove(element) {
		element.on("mousemove", function (e) {
			var lastpos = lastMousePosition;
			if (lastpos === undefined || lastpos.x !== e.pageX || lastpos.y !== e.pageY) {
				$(e.target).trigger("mousemove-filtered", e);
			}
		});
	}

	/**
	 * Debounces a function. Returns a function that calls the original fn function only if no invocations have been made
	 * within the last quietMillis milliseconds.
	 *
	 * @param quietMillis number of milliseconds to wait before invoking fn
	 * @param fn function to be debounced
	 * @param ctx object to be used as this reference within fn
	 * @return debounced version of fn
	 */
	function debounce(quietMillis, fn, ctx) {
		ctx = ctx || undefined;
		var timeout;
		return function () {
			var args = arguments;
			window.clearTimeout(timeout);
			timeout = window.setTimeout(function () {
				fn.apply(ctx, args);
			}, quietMillis);
		};
	}

	/**
	 * A simple implementation of a thunk
	 * @param formula function used to lazily initialize the thunk
	 * @return {Function}
	 */
	function thunk(formula) {
		var evaluated = false,
			value;
		return function () {
			if (evaluated === false) {
				value = formula();
				evaluated = true;
			}
			return value;
		};
	};

	function installDebouncedScroll(threshold, element) {
		var notify = debounce(threshold, function (e) {
			element.trigger("scroll-debounced", e);
		});
		element.on("scroll", function (e) {
			if (indexOf(e.target, element.get()) >= 0) notify(e);
		});
	}

	function focus($el) {
		if ($el[0] === document.activeElement) return;

		/* set the focus in a 0 timeout - that way the focus is set after the processing
		 of the current event has finished - which seems like the only reliable way
		 to set focus */
		window.setTimeout(function () {
			var el = $el[0], pos = $el.val().length, range;

			$el.focus();

			/* make sure el received focus so we do not error out when trying to manipulate the caret.
			 sometimes modals or others listeners may steal it after its set */
			if ($el.is(":visible") && el === document.activeElement) {

				/* after the focus is set move the caret to the end, necessary when we val()
				 just before setting focus */
				if (el.setSelectionRange) {
					el.setSelectionRange(pos, pos);
				}
				else if (el.createTextRange) {
					range = el.createTextRange();
					range.collapse(false);
					range.select();
				}
			}
		}, 0);
	}

	function getCursorInfo(el) {
		el = $(el)[0];
		var offset = 0;
		var length = 0;
		if ('selectionStart' in el) {
			offset = el.selectionStart;
			length = el.selectionEnd - offset;
		} else if ('selection' in document) {
			el.focus();
			var sel = document.selection.createRange();
			length = document.selection.createRange().text.length;
			sel.moveStart('character', -el.value.length);
			offset = sel.text.length - length;
		}
		return { offset: offset, length: length };
	}

	function killEvent(event) {
		event.preventDefault();
		event.stopPropagation();
	}

	function killEventImmediately(event) {
		event.preventDefault();
		event.stopImmediatePropagation();
	}

	function measureTextWidth(e) {
		if (!sizer) {
			var style = e[0].currentStyle || window.getComputedStyle(e[0], null);
			sizer = $(document.createElement("div")).css({
															 position: "absolute",
															 left: "-10000px",
															 top: "-10000px",
															 display: "none",
															 fontSize: style.fontSize,
															 fontFamily: style.fontFamily,
															 fontStyle: style.fontStyle,
															 fontWeight: style.fontWeight,
															 letterSpacing: style.letterSpacing,
															 textTransform: style.textTransform,
															 whiteSpace: "nowrap"
														 });
			sizer.attr("class", "select2-sizer");
			$("body").append(sizer);
		}
		sizer.text(e.val());
		return sizer.width();
	}

	function syncCssClasses(dest, src, adapter) {
		var classes, replacements = [], adapted;

		classes = dest.attr("class");
		if (classes) {
			classes = '' + classes; // for IE which returns object
			$(classes.split(" ")).each2(function () {
				if (this.indexOf("select2-") === 0) {
					replacements.push(this);
				}
			});
		}
		classes = src.attr("class");
		if (classes) {
			classes = '' + classes; // for IE which returns object
			$(classes.split(" ")).each2(function () {
				if (this.indexOf("select2-") !== 0) {
					adapted = adapter(this);
					if (adapted) {
						replacements.push(adapted);
					}
				}
			});
		}
		dest.attr("class", replacements.join(" "));
	}


	function markMatch(text, term, markup, escapeMarkup) {
		var match = stripDiacritics(text.toUpperCase()).indexOf(stripDiacritics(term.toUpperCase())),
			tl = term.length;

		if (match < 0) {
			markup.push(escapeMarkup(text));
			return;
		}

		markup.push(escapeMarkup(text.substring(0, match)));
		markup.push("<span class='select2-match'>");
		markup.push(escapeMarkup(text.substring(match, match + tl)));
		markup.push("</span>");
		markup.push(escapeMarkup(text.substring(match + tl, text.length)));
	}

	function defaultEscapeMarkup(markup) {
		var replace_map = {
			'\\': '&#92;',
			'&': '&amp;',
			'<': '&lt;',
			'>': '&gt;',
			'"': '&quot;',
			"'": '&#39;',
			"/": '&#47;'
		};

		return String(markup).replace(/[&<>"'\/\\]/g, function (match) {
			return replace_map[match];
		});
	}

	/**
	 * Produces an ajax-based query function
	 *
	 * @param options object containing configuration paramters
	 * @param options.params parameter map for the transport ajax call, can contain such options as cache, jsonpCallback, etc. see $.ajax
	 * @param options.transport function that will be used to execute the ajax request. must be compatible with parameters supported by $.ajax
	 * @param options.url url for the data
	 * @param options.data a function(searchTerm, pageNumber, context) that should return an object containing query string parameters for the above url.
	 * @param options.dataType request data type: ajax, jsonp, other datatatypes supported by jQuery's $.ajax function or the transport function if specified
	 * @param options.quietMillis (optional) milliseconds to wait before making the ajaxRequest, helps debounce the ajax function if invoked too often
	 * @param options.results a function(remoteData, pageNumber) that converts data returned form the remote request to the format expected by Select2.
	 *      The expected format is an object containing the following keys:
	 *      results array of objects that will be used as choices
	 *      more (optional) boolean indicating whether there are more results available
	 *      Example: {results:[{id:1, text:'Red'},{id:2, text:'Blue'}], more:true}
	 */
	function ajax(options) {
		var timeout, // current scheduled but not yet executed request
			handler = null,
			quietMillis = options.quietMillis || 100,
			ajaxUrl = options.url,
			self = this;

		return function (query) {
			window.clearTimeout(timeout);
			timeout = window.setTimeout(function () {
				var data = options.data, // ajax data function
					url = ajaxUrl, // ajax url string or function
					transport = options.transport || $.fn.select2.ajaxDefaults.transport,
				// deprecated - to be removed in 4.0  - use params instead
					deprecated = {
						type: options.type || 'GET', // set type of request (GET or POST)
						cache: options.cache || false,
						jsonpCallback: options.jsonpCallback || undefined,
						dataType: options.dataType || "json"
					},
					params = $.extend({}, $.fn.select2.ajaxDefaults.params, deprecated);

				data = data ? data.call(self, query.term, query.page, query.context) : null;
				url = (typeof url === 'function') ? url.call(self, query.term, query.page, query.context) : url;

				if (handler) {
					handler.abort();
				}

				if (options.params) {
					if ($.isFunction(options.params)) {
						$.extend(params, options.params.call(self));
					} else {
						$.extend(params, options.params);
					}
				}

				$.extend(params, {
					url: url,
					dataType: options.dataType,
					data: data,
					success: function (data) {
						// TODO - replace query.page with query so users have access to term, page, etc.
						var results = options.results(data, query.page);
						query.callback(results);
					}
				});
				handler = transport.call(self, params);
			}, quietMillis);
		};
	}

	/**
	 * Produces a query function that works with a local array
	 *
	 * @param options object containing configuration parameters. The options parameter can either be an array or an
	 * object.
	 *
	 * If the array form is used it is assumed that it contains objects with 'id' and 'text' keys.
	 *
	 * If the object form is used ti is assumed that it contains 'data' and 'text' keys. The 'data' key should contain
	 * an array of objects that will be used as choices. These objects must contain at least an 'id' key. The 'text'
	 * key can either be a String in which case it is expected that each element in the 'data' array has a key with the
	 * value of 'text' which will be used to match choices. Alternatively, text can be a function(item) that can extract
	 * the text.
	 */
	function local(options) {
		var data = options, // data elements
			dataText,
			tmp,
			text = function (item) {
				return "" + item.text;
			}; // function used to retrieve the text portion of a data item that is matched against the search

		if ($.isArray(data)) {
			tmp = data;
			data = { results: tmp };
		}

		if ($.isFunction(data) === false) {
			tmp = data;
			data = function () {
				return tmp;
			};
		}

		var dataItem = data();
		if (dataItem.text) {
			text = dataItem.text;
			// if text is not a function we assume it to be a key name
			if (!$.isFunction(text)) {
				dataText = dataItem.text; // we need to store this in a separate variable because in the next step data gets reset and data.text is no longer available
				text = function (item) {
					return item[dataText];
				};
			}
		}

		return function (query) {
			var t = query.term, filtered = { results: [] }, process;
			if (t === "") {
				query.callback(data());
				return;
			}

			process = function (datum, collection) {
				var group, attr;
				datum = datum[0];
				if (datum.children) {
					group = {};
					for (attr in datum) {
						if (datum.hasOwnProperty(attr)) group[attr] = datum[attr];
					}
					group.children = [];
					$(datum.children).each2(function (i, childDatum) {
						process(childDatum, group.children);
					});
					if (group.children.length || query.matcher(t, text(group), datum)) {
						collection.push(group);
					}
				} else {
					if (query.matcher(t, text(datum), datum)) {
						collection.push(datum);
					}
				}
			};

			$(data().results).each2(function (i, datum) {
				process(datum, filtered.results);
			});
			query.callback(filtered);
		};
	}

	// TODO javadoc
	function tags(data) {
		var isFunc = $.isFunction(data);
		return function (query) {
			var t = query.term, filtered = {results: []};
			$(isFunc ? data() : data).each(function () {
				var isObject = this.text !== undefined,
					text = isObject ? this.text : this;
				if (t === "" || query.matcher(t, text)) {
					filtered.results.push(isObject ? this : {id: this, text: this});
				}
			});
			query.callback(filtered);
		};
	}

	/**
	 * Checks if the formatter function should be used.
	 *
	 * Throws an error if it is not a function. Returns true if it should be used,
	 * false if no formatting should be performed.
	 *
	 * @param formatter
	 */
	function checkFormatter(formatter, formatterName) {
		if ($.isFunction(formatter)) return true;
		if (!formatter) return false;
		throw new Error(formatterName + " must be a function or a falsy value");
	}

	function evaluate(val) {
		return $.isFunction(val) ? val() : val;
	}

	function countResults(results) {
		var count = 0;
		$.each(results, function (i, item) {
			if (item.children) {
				count += countResults(item.children);
			} else {
				count++;
			}
		});
		return count;
	}

	/**
	 * Default tokenizer. This function uses breaks the input on substring match of any string from the
	 * opts.tokenSeparators array and uses opts.createSearchChoice to create the choice object. Both of those
	 * two options have to be defined in order for the tokenizer to work.
	 *
	 * @param input text user has typed so far or pasted into the search field
	 * @param selection currently selected choices
	 * @param selectCallback function(choice) callback tho add the choice to selection
	 * @param opts select2's opts
	 * @return undefined/null to leave the current input unchanged, or a string to change the input to the returned value
	 */
	function defaultTokenizer(input, selection, selectCallback, opts) {
		var original = input, // store the original so we can compare and know if we need to tell the search to update its text
			dupe = false, // check for whether a token we extracted represents a duplicate selected choice
			token, // token
			index, // position at which the separator was found
			i, l, // looping variables
			separator; // the matched separator

		if (!opts.createSearchChoice || !opts.tokenSeparators || opts.tokenSeparators.length < 1) return undefined;

		while (true) {
			index = -1;

			for (i = 0, l = opts.tokenSeparators.length; i < l; i++) {
				separator = opts.tokenSeparators[i];
				index = input.indexOf(separator);
				if (index >= 0) break;
			}

			if (index < 0) break; // did not find any token separator in the input string, bail

			token = input.substring(0, index);
			input = input.substring(index + separator.length);

			if (token.length > 0) {
				token = opts.createSearchChoice.call(this, token, selection);
				if (token !== undefined && token !== null && opts.id(token) !== undefined && opts.id(token) !== null) {
					dupe = false;
					for (i = 0, l = selection.length; i < l; i++) {
						if (equal(opts.id(token), opts.id(selection[i]))) {
							dupe = true;
							break;
						}
					}

					if (!dupe) selectCallback(token);
				}
			}
		}

		if (original !== input) return input;
	}

	/**
	 * Creates a new class
	 *
	 * @param superClass
	 * @param methods
	 */
	function clazz(SuperClass, methods) {
		var constructor = function () {
		};
		constructor.prototype = new SuperClass;
		constructor.prototype.constructor = constructor;
		constructor.prototype.parent = SuperClass.prototype;
		constructor.prototype = $.extend(constructor.prototype, methods);
		return constructor;
	}

	AbstractSelect2 = clazz(Object, {

		// abstract
		bind: function (func) {
			var self = this;
			return function () {
				func.apply(self, arguments);
			};
		},

		// abstract
		init: function (opts) {
			var results, search, resultsSelector = ".select2-results";

			// prepare options
			this.opts = opts = this.prepareOpts(opts);

			this.id = opts.id;

			// destroy if called on an existing component
			if (opts.element.data("select2") !== undefined &&
				opts.element.data("select2") !== null) {
				opts.element.data("select2").destroy();
			}

			this.container = this.createContainer();

			this.containerId = "s2id_" + (opts.element.attr("id") || "autogen" + nextUid());
			this.containerSelector = "#" + this.containerId.replace(/([;&,\.\+\*\~':"\!\^#$%@\[\]\(\)=>\|])/g, '\\$1');
			this.container.attr("id", this.containerId);

			// cache the body so future lookups are cheap
			this.body = thunk(function () {
				return opts.element.closest("body");
			});

			syncCssClasses(this.container, this.opts.element, this.opts.adaptContainerCssClass);

			this.container.attr("style", opts.element.attr("style"));
			this.container.css(evaluate(opts.containerCss));
			this.container.addClass(evaluate(opts.containerCssClass));

			this.elementTabIndex = this.opts.element.attr("tabindex");

			// swap container for the element
			this.opts.element
				.data("select2", this)
				.attr("tabindex", "-1")
				.before(this.container)
				.on("click.select2", killEvent); // do not leak click events

			this.container.data("select2", this);

			this.dropdown = this.container.find(".select2-drop");

			syncCssClasses(this.dropdown, this.opts.element, this.opts.adaptDropdownCssClass);

			this.dropdown.addClass(evaluate(opts.dropdownCssClass));
			this.dropdown.data("select2", this);
			this.dropdown.on("click", killEvent);

			this.results = results = this.container.find(resultsSelector);
			this.search = search = this.container.find("input.select2-input");

			this.queryCount = 0;
			this.resultsPage = 0;
			this.context = null;

			// initialize the container
			this.initContainer();

			this.container.on("click", killEvent);

			installFilteredMouseMove(this.results);
			this.dropdown.on("mousemove-filtered touchstart touchmove touchend", resultsSelector, this.bind(this.highlightUnderEvent));

			installDebouncedScroll(80, this.results);
			this.dropdown.on("scroll-debounced", resultsSelector, this.bind(this.loadMoreIfNeeded));

			// do not propagate change event from the search field out of the component
			$(this.container).on("change", ".select2-input", function (e) {
				e.stopPropagation();
			});
			$(this.dropdown).on("change", ".select2-input", function (e) {
				e.stopPropagation();
			});

			// if jquery.mousewheel plugin is installed we can prevent out-of-bounds scrolling of results via mousewheel
			if ($.fn.mousewheel) {
				results.mousewheel(function (e, delta, deltaX, deltaY) {
					var top = results.scrollTop();
					if (deltaY > 0 && top - deltaY <= 0) {
						results.scrollTop(0);
						killEvent(e);
					} else if (deltaY < 0 && results.get(0).scrollHeight - results.scrollTop() + deltaY <= results.height()) {
						results.scrollTop(results.get(0).scrollHeight - results.height());
						killEvent(e);
					}
				});
			}

			installKeyUpChangeEvent(search);
			search.on("keyup-change input paste", this.bind(this.updateResults));
			search.on("focus", function () {
				search.addClass("select2-focused");
			});
			search.on("blur", function () {
				search.removeClass("select2-focused");
			});

			this.dropdown.on("mouseup", resultsSelector, this.bind(function (e) {
				if ($(e.target).closest(".select2-result-selectable").length > 0) {
					this.highlightUnderEvent(e);
					this.selectHighlighted(e);
				}
			}));

			// trap all mouse events from leaving the dropdown. sometimes there may be a modal that is listening
			// for mouse events outside of itself so it can close itself. since the dropdown is now outside the select2's
			// dom it will trigger the popup close, which is not what we want
			this.dropdown.on("click mouseup mousedown", function (e) {
				e.stopPropagation();
			});

			if ($.isFunction(this.opts.initSelection)) {
				// initialize selection based on the current value of the source element
				this.initSelection();

				// if the user has provided a function that can set selection based on the value of the source element
				// we monitor the change event on the element and trigger it, allowing for two way synchronization
				this.monitorSource();
			}

			if (opts.maximumInputLength !== null) {
				this.search.attr("maxlength", opts.maximumInputLength);
			}

			var disabled = opts.element.prop("disabled");
			if (disabled === undefined) disabled = false;
			this.enable(!disabled);

			var readonly = opts.element.prop("readonly");
			if (readonly === undefined) readonly = false;
			this.readonly(readonly);

			// Calculate size of scrollbar
			scrollBarDimensions = scrollBarDimensions || measureScrollbar();

			this.autofocus = opts.element.prop("autofocus");
			opts.element.prop("autofocus", false);
			if (this.autofocus) this.focus();

			this.nextSearchTerm = undefined;
		},

		// abstract
		destroy: function () {
			var element = this.opts.element, select2 = element.data("select2");

			this.close();

			if (this.propertyObserver) {
				delete this.propertyObserver;
				this.propertyObserver = null;
			}

			if (select2 !== undefined) {
				select2.container.remove();
				select2.dropdown.remove();
				element
					.removeClass("select2-offscreen")
					.removeData("select2")
					.off(".select2")
					.prop("autofocus", this.autofocus || false);
				if (this.elementTabIndex) {
					element.attr({tabindex: this.elementTabIndex});
				} else {
					element.removeAttr("tabindex");
				}
				element.show();
			}
		},

		// abstract
		optionToData: function (element) {
			if (element.is("option")) {
				return {
					id: element.prop("value"),
					text: element.text(),
					element: element.get(),
					css: element.attr("class"),
					disabled: element.prop("disabled"),
					locked: equal(element.attr("locked"), "locked") || equal(element.data("locked"), true)
				};
			} else if (element.is("optgroup")) {
				return {
					text: element.attr("label"),
					children: [],
					element: element.get(),
					css: element.attr("class")
				};
			}
		},

		// abstract
		prepareOpts: function (opts) {
			var element, select, idKey, ajaxUrl, self = this;

			element = opts.element;

			if (element.get(0).tagName.toLowerCase() === "select") {
				this.select = select = opts.element;
			}

			if (select) {
				// these options are not allowed when attached to a select because they are picked up off the element itself
				$.each(["id", "multiple", "ajax", "query", "createSearchChoice", "initSelection", "data", "tags"], function () {
					if (this in opts) {
						throw new Error("Option '" + this + "' is not allowed for Select2 when attached to a <select> element.");
					}
				});
			}

			opts = $.extend({}, {
				populateResults: function (container, results, query) {
					var populate, id = this.opts.id;

					populate = function (results, container, depth) {

						var i, l, result, selectable, disabled, compound, node, label, innerContainer, formatted;

						results = opts.sortResults(results, container, query);

						for (i = 0, l = results.length; i < l; i = i + 1) {

							result = results[i];

							disabled = (result.disabled === true);
							selectable = (!disabled) && (id(result) !== undefined);

							compound = result.children && result.children.length > 0;

							node = $("<li></li>");
							node.addClass("select2-results-dept-" + depth);
							node.addClass("select2-result");
							node.addClass(selectable ? "select2-result-selectable" : "select2-result-unselectable");
							if (disabled) {
								node.addClass("select2-disabled");
							}
							if (compound) {
								node.addClass("select2-result-with-children");
							}
							node.addClass(self.opts.formatResultCssClass(result));

							label = $(document.createElement("div"));
							label.addClass("select2-result-label");

							formatted = opts.formatResult(result, label, query, self.opts.escapeMarkup);
							if (formatted !== undefined) {
								label.html(formatted);
							}

							node.append(label);

							if (compound) {

								innerContainer = $("<ul></ul>");
								innerContainer.addClass("select2-result-sub");
								populate(result.children, innerContainer, depth + 1);
								node.append(innerContainer);
							}

							node.data("select2-data", result);
							container.append(node);
						}
					};

					populate(results, container, 0);
				}
			}, $.fn.select2.defaults, opts);

			if (typeof(opts.id) !== "function") {
				idKey = opts.id;
				opts.id = function (e) {
					return e[idKey];
				};
			}

			if ($.isArray(opts.element.data("select2Tags"))) {
				if ("tags" in opts) {
					throw "tags specified as both an attribute 'data-select2-tags' and in options of Select2 " + opts.element.attr("id");
				}
				opts.tags = opts.element.data("select2Tags");
			}

			if (select) {
				opts.query = this.bind(function (query) {
					var data = { results: [], more: false },
						term = query.term,
						children, placeholderOption, process;

					process = function (element, collection) {
						var group;
						if (element.is("option")) {
							if (query.matcher(term, element.text(), element)) {
								collection.push(self.optionToData(element));
							}
						} else if (element.is("optgroup")) {
							group = self.optionToData(element);
							element.children().each2(function (i, elm) {
								process(elm, group.children);
							});
							if (group.children.length > 0) {
								collection.push(group);
							}
						}
					};

					children = element.children();

					// ignore the placeholder option if there is one
					if (this.getPlaceholder() !== undefined && children.length > 0) {
						placeholderOption = this.getPlaceholderOption();
						if (placeholderOption) {
							children = children.not(placeholderOption);
						}
					}

					children.each2(function (i, elm) {
						process(elm, data.results);
					});

					query.callback(data);
				});
				// this is needed because inside val() we construct choices from options and there id is hardcoded
				opts.id = function (e) {
					return e.id;
				};
				opts.formatResultCssClass = function (data) {
					return data.css;
				};
			} else {
				if (!("query" in opts)) {

					if ("ajax" in opts) {
						ajaxUrl = opts.element.data("ajax-url");
						if (ajaxUrl && ajaxUrl.length > 0) {
							opts.ajax.url = ajaxUrl;
						}
						opts.query = ajax.call(opts.element, opts.ajax);
					} else if ("data" in opts) {
						opts.query = local(opts.data);
					} else if ("tags" in opts) {
						opts.query = tags(opts.tags);
						if (opts.createSearchChoice === undefined) {
							opts.createSearchChoice = function (term) {
								return {id: $.trim(term), text: $.trim(term)};
							};
						}
						if (opts.initSelection === undefined) {
							opts.initSelection = function (element, callback) {
								var data = [];
								$(splitVal(element.val(), opts.separator)).each(function () {
									var obj = { id: this, text: this },
										tags = opts.tags;
									if ($.isFunction(tags)) tags = tags();
									$(tags).each(function () {
										if (equal(this.id, obj.id)) {
											obj = this;
											return false;
										}
									});
									data.push(obj);
								});

								callback(data);
							};
						}
					}
				}
			}
			if (typeof(opts.query) !== "function") {
				throw "query function not defined for Select2 " + opts.element.attr("id");
			}

			return opts;
		},

		/**
		 * Monitor the original element for changes and update select2 accordingly
		 */
		// abstract
		monitorSource: function () {
			var el = this.opts.element, sync, observer;

			el.on("change.select2", this.bind(function (e) {
				if (this.opts.element.data("select2-change-triggered") !== true) {
					this.initSelection();
				}
			}));

			sync = this.bind(function () {

				// sync enabled state
				var disabled = el.prop("disabled");
				if (disabled === undefined) disabled = false;
				this.enable(!disabled);

				var readonly = el.prop("readonly");
				if (readonly === undefined) readonly = false;
				this.readonly(readonly);

				syncCssClasses(this.container, this.opts.element, this.opts.adaptContainerCssClass);
				this.container.addClass(evaluate(this.opts.containerCssClass));

				syncCssClasses(this.dropdown, this.opts.element, this.opts.adaptDropdownCssClass);
				this.dropdown.addClass(evaluate(this.opts.dropdownCssClass));

			});

			// IE8-10
			el.on("propertychange.select2", sync);

			// hold onto a reference of the callback to work around a chromium bug
			if (this.mutationCallback === undefined) {
				this.mutationCallback = function (mutations) {
					mutations.forEach(sync);
				}
			}

			// safari, chrome, firefox, IE11
			observer = window.MutationObserver || window.WebKitMutationObserver || window.MozMutationObserver;
			if (observer !== undefined) {
				if (this.propertyObserver) {
					delete this.propertyObserver;
					this.propertyObserver = null;
				}
				this.propertyObserver = new observer(this.mutationCallback);
				this.propertyObserver.observe(el.get(0), { attributes: true, subtree: false });
			}
		},

		// abstract
		triggerSelect: function (data) {
			var evt = $.Event("select2-selecting", { val: this.id(data), object: data });
			this.opts.element.trigger(evt);
			return !evt.isDefaultPrevented();
		},

		/**
		 * Triggers the change event on the source element
		 */
		// abstract
		triggerChange: function (details) {

			details = details || {};
			details = $.extend({}, details, { type: "change", val: this.val() });
			// prevents recursive triggering
			this.opts.element.data("select2-change-triggered", true);
			this.opts.element.trigger(details);
			this.opts.element.data("select2-change-triggered", false);

			// some validation frameworks ignore the change event and listen instead to keyup, click for selects
			// so here we trigger the click event manually
			this.opts.element.click();

			// ValidationEngine ignorea the change event and listens instead to blur
			// so here we trigger the blur event manually if so desired
			if (this.opts.blurOnChange)
				this.opts.element.blur();
		},

		//abstract
		isInterfaceEnabled: function () {
			return this.enabledInterface === true;
		},

		// abstract
		enableInterface: function () {
			var enabled = this._enabled && !this._readonly,
				disabled = !enabled;

			if (enabled === this.enabledInterface) return false;

			this.container.toggleClass("select2-container-disabled", disabled);
			this.close();
			this.enabledInterface = enabled;

			return true;
		},

		// abstract
		enable: function (enabled) {
			if (enabled === undefined) enabled = true;
			if (this._enabled === enabled) return;
			this._enabled = enabled;

			this.opts.element.prop("disabled", !enabled);
			this.enableInterface();
		},

		// abstract
		disable: function () {
			this.enable(false);
		},

		// abstract
		readonly: function (enabled) {
			if (enabled === undefined) enabled = false;
			if (this._readonly === enabled) return false;
			this._readonly = enabled;

			this.opts.element.prop("readonly", enabled);
			this.enableInterface();
			return true;
		},

		// abstract
		opened: function () {
			return this.container.hasClass("select2-dropdown-open");
		},

		// abstract
		positionDropdown: function () {
			var $dropdown = this.dropdown,
				offset = this.container.offset(),
				height = this.container.outerHeight(false),
				width = this.container.outerWidth(false),
				dropHeight = $dropdown.outerHeight(false),
				$window = $(window),
				windowWidth = $window.width(),
				windowHeight = $window.height(),
				viewPortRight = $window.scrollLeft() + windowWidth,
				viewportBottom = $window.scrollTop() + windowHeight,
				dropTop = offset.top + height,
				dropLeft = offset.left,
				enoughRoomBelow = dropTop + dropHeight <= viewportBottom,
				enoughRoomAbove = (offset.top - dropHeight) >= this.body().scrollTop(),
				dropWidth = $dropdown.outerWidth(false),
				enoughRoomOnRight = dropLeft + dropWidth <= viewPortRight,
				aboveNow = $dropdown.hasClass("select2-drop-above"),
				bodyOffset,
				above,
				changeDirection,
				css,
				resultsListNode;

			// always prefer the current above/below alignment, unless there is not enough room
			if (aboveNow) {
				above = true;
				if (!enoughRoomAbove && enoughRoomBelow) {
					changeDirection = true;
					above = false;
				}
			} else {
				above = false;
				if (!enoughRoomBelow && enoughRoomAbove) {
					changeDirection = true;
					above = true;
				}
			}

			//if we are changing direction we need to get positions when dropdown is hidden;
			if (changeDirection) {
				$dropdown.hide();
				offset = this.container.offset();
				height = this.container.outerHeight(false);
				width = this.container.outerWidth(false);
				dropHeight = $dropdown.outerHeight(false);
				viewPortRight = $window.scrollLeft() + windowWidth;
				viewportBottom = $window.scrollTop() + windowHeight;
				dropTop = offset.top + height;
				dropLeft = offset.left;
				dropWidth = $dropdown.outerWidth(false);
				enoughRoomOnRight = dropLeft + dropWidth <= viewPortRight;
				$dropdown.show();
			}

			if (this.opts.dropdownAutoWidth) {
				resultsListNode = $('.select2-results', $dropdown)[0];
				$dropdown.addClass('select2-drop-auto-width');
				$dropdown.css('width', '');
				// Add scrollbar width to dropdown if vertical scrollbar is present
				dropWidth = $dropdown.outerWidth(false) + (resultsListNode.scrollHeight === resultsListNode.clientHeight ? 0 : scrollBarDimensions.width);
				dropWidth > width ? width = dropWidth : dropWidth = width;
				enoughRoomOnRight = dropLeft + dropWidth <= viewPortRight;
			}
			else {
				this.container.removeClass('select2-drop-auto-width');
			}

			//console.log("below/ droptop:", dropTop, "dropHeight", dropHeight, "sum", (dropTop+dropHeight)+" viewport bottom", viewportBottom, "enough?", enoughRoomBelow);
			//console.log("above/ offset.top", offset.top, "dropHeight", dropHeight, "top", (offset.top-dropHeight), "scrollTop", this.body().scrollTop(), "enough?", enoughRoomAbove);

			// fix positioning when body has an offset and is not position: static
			if (this.body().css('position') !== 'static') {
				bodyOffset = this.body().offset();
				dropTop -= bodyOffset.top;
				dropLeft -= bodyOffset.left;
			}

			if (!enoughRoomOnRight) {
				dropLeft = offset.left + width - dropWidth;
			}

			css = {
				left: dropLeft,
				width: width
			};

			if (above) {
				css.bottom = windowHeight - offset.top;
				css.top = 'auto';
				this.container.addClass("select2-drop-above");
				$dropdown.addClass("select2-drop-above");
			}
			else {
				css.top = dropTop;
				css.bottom = 'auto';
				this.container.removeClass("select2-drop-above");
				$dropdown.removeClass("select2-drop-above");
			}
			css = $.extend(css, evaluate(this.opts.dropdownCss));

			$dropdown.css(css);
		},

		// abstract
		shouldOpen: function () {
			var event;

			if (this.opened()) return false;

			if (this._enabled === false || this._readonly === true) return false;

			event = $.Event("select2-opening");
			this.opts.element.trigger(event);
			return !event.isDefaultPrevented();
		},

		// abstract
		clearDropdownAlignmentPreference: function () {
			// clear the classes used to figure out the preference of where the dropdown should be opened
			this.container.removeClass("select2-drop-above");
			this.dropdown.removeClass("select2-drop-above");
		},

		/**
		 * Opens the dropdown
		 *
		 * @return {Boolean} whether or not dropdown was opened. This method will return false if, for example,
		 * the dropdown is already open, or if the 'open' event listener on the element called preventDefault().
		 */
		// abstract
		open: function () {

			if (!this.shouldOpen()) return false;

			this.opening();

			return true;
		},

		/**
		 * Performs the opening of the dropdown
		 */
		// abstract
		opening: function () {
			var cid = this.containerId,
				scroll = "scroll." + cid,
				resize = "resize." + cid,
				orient = "orientationchange." + cid,
				mask;

			this.container.addClass("select2-dropdown-open").addClass("select2-container-active");

			this.clearDropdownAlignmentPreference();

			if (this.dropdown[0] !== this.body().children().last()[0]) {
				this.dropdown.detach().appendTo(this.body());
			}

			// create the dropdown mask if doesnt already exist
			mask = $("#select2-drop-mask");
			if (mask.length == 0) {
				mask = $(document.createElement("div"));
				mask.attr("id", "select2-drop-mask").attr("class", "select2-drop-mask");
				mask.hide();
				mask.appendTo(this.body());
				mask.on("mousedown touchstart click", function (e) {
					var dropdown = $("#select2-drop"), self;
					if (dropdown.length > 0) {
						self = dropdown.data("select2");
						if (self.opts.selectOnBlur) {
							self.selectHighlighted({noFocus: true});
						}
						self.close({focus: true});
						e.preventDefault();
						e.stopPropagation();
					}
				});
			}

			// ensure the mask is always right before the dropdown
			if (this.dropdown.prev()[0] !== mask[0]) {
				this.dropdown.before(mask);
			}

			// move the global id to the correct dropdown
			$("#select2-drop").removeAttr("id");
			this.dropdown.attr("id", "select2-drop");

			// show the elements
			mask.show();

			this.positionDropdown();
			this.dropdown.show();
			this.positionDropdown();

			this.dropdown.addClass("select2-drop-active");

			// attach listeners to events that can change the position of the container and thus require
			// the position of the dropdown to be updated as well so it does not come unglued from the container
			var that = this;
			this.container.parents().add(window).each(function () {
				$(this).on(resize + " " + scroll + " " + orient, function (e) {
					that.positionDropdown();
				});
			});


		},

		// abstract
		close: function () {
			if (!this.opened()) return;

			var cid = this.containerId,
				scroll = "scroll." + cid,
				resize = "resize." + cid,
				orient = "orientationchange." + cid;

			// unbind event listeners
			this.container.parents().add(window).each(function () {
				$(this).off(scroll).off(resize).off(orient);
			});

			this.clearDropdownAlignmentPreference();

			$("#select2-drop-mask").hide();
			this.dropdown.removeAttr("id"); // only the active dropdown has the select2-drop id
			this.dropdown.hide();
			this.container.removeClass("select2-dropdown-open").removeClass("select2-container-active");
			this.results.empty();


			this.clearSearch();
			this.search.removeClass("select2-active");
			this.opts.element.trigger($.Event("select2-close"));
		},

		/**
		 * Opens control, sets input value, and updates results.
		 */
		// abstract
		externalSearch: function (term) {
			this.open();
			this.search.val(term);
			this.updateResults(false);
		},

		// abstract
		clearSearch: function () {

		},

		//abstract
		getMaximumSelectionSize: function () {
			return evaluate(this.opts.maximumSelectionSize);
		},

		// abstract
		ensureHighlightVisible: function () {
			var results = this.results, children, index, child, hb, rb, y, more;

			index = this.highlight();

			if (index < 0) return;

			if (index == 0) {

				// if the first element is highlighted scroll all the way to the top,
				// that way any unselectable headers above it will also be scrolled
				// into view

				results.scrollTop(0);
				return;
			}

			children = this.findHighlightableChoices().find('.select2-result-label');

			child = $(children[index]);

			hb = child.offset().top + child.outerHeight(true);

			// if this is the last child lets also make sure select2-more-results is visible
			if (index === children.length - 1) {
				more = results.find("li.select2-more-results");
				if (more.length > 0) {
					hb = more.offset().top + more.outerHeight(true);
				}
			}

			rb = results.offset().top + results.outerHeight(true);
			if (hb > rb) {
				results.scrollTop(results.scrollTop() + (hb - rb));
			}
			y = child.offset().top - results.offset().top;

			// make sure the top of the element is visible
			if (y < 0 && child.css('display') != 'none') {
				results.scrollTop(results.scrollTop() + y); // y is negative
			}
		},

		// abstract
		findHighlightableChoices: function () {
			return this.results.find(".select2-result-selectable:not(.select2-disabled, .select2-selected)");
		},

		// abstract
		moveHighlight: function (delta) {
			var choices = this.findHighlightableChoices(),
				index = this.highlight();

			while (index > -1 && index < choices.length) {
				index += delta;
				var choice = $(choices[index]);
				if (choice.hasClass("select2-result-selectable") && !choice.hasClass("select2-disabled") && !choice.hasClass("select2-selected")) {
					this.highlight(index);
					break;
				}
			}
		},

		// abstract
		highlight: function (index) {
			var choices = this.findHighlightableChoices(),
				choice,
				data;

			if (arguments.length === 0) {
				return indexOf(choices.filter(".select2-highlighted")[0], choices.get());
			}

			if (index >= choices.length) index = choices.length - 1;
			if (index < 0) index = 0;

			this.removeHighlight();

			choice = $(choices[index]);
			choice.addClass("select2-highlighted");

			this.ensureHighlightVisible();

			data = choice.data("select2-data");
			if (data) {
				this.opts.element.trigger({ type: "select2-highlight", val: this.id(data), choice: data });
			}
		},

		removeHighlight: function () {
			this.results.find(".select2-highlighted").removeClass("select2-highlighted");
		},

		// abstract
		countSelectableResults: function () {
			return this.findHighlightableChoices().length;
		},

		// abstract
		highlightUnderEvent: function (event) {
			var el = $(event.target).closest(".select2-result-selectable");
			if (el.length > 0 && !el.is(".select2-highlighted")) {
				var choices = this.findHighlightableChoices();
				this.highlight(choices.index(el));
			} else if (el.length == 0) {
				// if we are over an unselectable item remove all highlights
				this.removeHighlight();
			}
		},

		// abstract
		loadMoreIfNeeded: function () {
			var results = this.results,
				more = results.find("li.select2-more-results"),
				below, // pixels the element is below the scroll fold, below==0 is when the element is starting to be visible
				page = this.resultsPage + 1,
				self = this,
				term = this.search.val(),
				context = this.context;

			if (more.length === 0) return;
			below = more.offset().top - results.offset().top - results.height();

			if (below <= this.opts.loadMorePadding) {
				more.addClass("select2-active");
				this.opts.query({
									element: this.opts.element,
									term: term,
									page: page,
									context: context,
									matcher: this.opts.matcher,
									callback: this.bind(function (data) {

										// ignore a response if the select2 has been closed before it was received
										if (!self.opened()) return;


										self.opts.populateResults.call(this, results, data.results, {term: term, page: page, context: context});
										self.postprocessResults(data, false, false);

										if (data.more === true) {
											more.detach().appendTo(results).text(self.opts.formatLoadMore(page + 1));
											window.setTimeout(function () {
												self.loadMoreIfNeeded();
											}, 10);
										} else {
											more.remove();
										}
										self.positionDropdown();
										self.resultsPage = page;
										self.context = data.context;
										this.opts.element.trigger({ type: "select2-loaded", items: data });
									})});
			}
		},

		/**
		 * Default tokenizer function which does nothing
		 */
		tokenize: function () {

		},

		/**
		 * @param initial whether or not this is the call to this method right after the dropdown has been opened
		 */
		// abstract
		updateResults: function (initial) {
			var search = this.search,
				results = this.results,
				opts = this.opts,
				data,
				self = this,
				input,
				term = search.val(),
				lastTerm = $.data(this.container, "select2-last-term"),
			// sequence number used to drop out-of-order responses
				queryNumber;

			// prevent duplicate queries against the same term
			if (initial !== true && lastTerm && equal(term, lastTerm)) return;

			$.data(this.container, "select2-last-term", term);

			// if the search is currently hidden we do not alter the results
			if (initial !== true && (this.showSearchInput === false || !this.opened())) {
				return;
			}

			function postRender() {
				search.removeClass("select2-active");
				self.positionDropdown();
			}

			function render(html) {
				results.html(html);
				postRender();
			}

			queryNumber = ++this.queryCount;

			var maxSelSize = this.getMaximumSelectionSize();
			if (maxSelSize >= 1) {
				data = this.data();
				if ($.isArray(data) && data.length >= maxSelSize && checkFormatter(opts.formatSelectionTooBig, "formatSelectionTooBig")) {
					render("<li class='select2-selection-limit'>" + opts.formatSelectionTooBig(maxSelSize) + "</li>");
					return;
				}
			}

			if (search.val().length < opts.minimumInputLength) {
				if (checkFormatter(opts.formatInputTooShort, "formatInputTooShort")) {
					render("<li class='select2-no-results'>" + opts.formatInputTooShort(search.val(), opts.minimumInputLength) + "</li>");
				} else {
					render("");
				}
				if (initial && this.showSearch) this.showSearch(true);
				return;
			}

			if (opts.maximumInputLength && search.val().length > opts.maximumInputLength) {
				if (checkFormatter(opts.formatInputTooLong, "formatInputTooLong")) {
					render("<li class='select2-no-results'>" + opts.formatInputTooLong(search.val(), opts.maximumInputLength) + "</li>");
				} else {
					render("");
				}
				return;
			}

			if (opts.formatSearching && this.findHighlightableChoices().length === 0) {
				render("<li class='select2-searching'>" + opts.formatSearching() + "</li>");
			}

			search.addClass("select2-active");

			this.removeHighlight();

			// give the tokenizer a chance to pre-process the input
			input = this.tokenize();
			if (input != undefined && input != null) {
				search.val(input);
			}

			this.resultsPage = 1;

			opts.query({
						   element: opts.element,
						   term: search.val(),
						   page: this.resultsPage,
						   context: null,
						   matcher: opts.matcher,
						   callback: this.bind(function (data) {
							   var def; // default choice

							   // ignore old responses
							   if (queryNumber != this.queryCount) {
								   return;
							   }

							   // ignore a response if the select2 has been closed before it was received
							   if (!this.opened()) {
								   this.search.removeClass("select2-active");
								   return;
							   }

							   // save context, if any
							   this.context = (data.context === undefined) ? null : data.context;
							   // create a default choice and prepend it to the list
							   if (this.opts.createSearchChoice && search.val() !== "") {
								   def = this.opts.createSearchChoice.call(self, search.val(), data.results);
								   if (def !== undefined && def !== null && self.id(def) !== undefined && self.id(def) !== null) {
									   if ($(data.results).filter(
										   function () {
											   return equal(self.id(this), self.id(def));
										   }).length === 0) {
										   data.results.unshift(def);
									   }
								   }
							   }

							   if (data.results.length === 0 && checkFormatter(opts.formatNoMatches, "formatNoMatches")) {
								   render("<li class='select2-no-results'>" + opts.formatNoMatches(search.val()) + "</li>");
								   return;
							   }

							   results.empty();
							   self.opts.populateResults.call(this, results, data.results, {term: search.val(), page: this.resultsPage, context: null});

							   if (data.more === true && checkFormatter(opts.formatLoadMore, "formatLoadMore")) {
								   results.append("<li class='select2-more-results'>" + self.opts.escapeMarkup(opts.formatLoadMore(this.resultsPage)) + "</li>");
								   window.setTimeout(function () {
									   self.loadMoreIfNeeded();
								   }, 10);
							   }

							   this.postprocessResults(data, initial);

							   postRender();

							   this.opts.element.trigger({ type: "select2-loaded", items: data });
						   })});
		},

		// abstract
		cancel: function () {
			this.close();
		},

		// abstract
		blur: function () {
			// if selectOnBlur == true, select the currently highlighted option
			if (this.opts.selectOnBlur)
				this.selectHighlighted({noFocus: true});

			this.close();
			this.container.removeClass("select2-container-active");
			// synonymous to .is(':focus'), which is available in jquery >= 1.6
			if (this.search[0] === document.activeElement) {
				this.search.blur();
			}
			this.clearSearch();
			this.selection.find(".select2-search-choice-focus").removeClass("select2-search-choice-focus");
		},

		// abstract
		focusSearch: function () {
			focus(this.search);
		},

		// abstract
		selectHighlighted: function (options) {
			var index = this.highlight(),
				highlighted = this.results.find(".select2-highlighted"),
				data = highlighted.closest('.select2-result').data("select2-data");

			if (data) {
				this.highlight(index);
				this.onSelect(data, options);
			} else if (options && options.noFocus) {
				this.close();
			}
		},

		// abstract
		getPlaceholder: function () {
			var placeholderOption;
			return this.opts.element.attr("placeholder") ||
				this.opts.element.attr("data-placeholder") || // jquery 1.4 compat
				this.opts.element.data("placeholder") ||
				this.opts.placeholder ||
				((placeholderOption = this.getPlaceholderOption()) !== undefined ? placeholderOption.text() : undefined);
		},

		// abstract
		getPlaceholderOption: function () {
			if (this.select) {
				var firstOption = this.select.children('option').first();
				if (this.opts.placeholderOption !== undefined) {
					//Determine the placeholder option based on the specified placeholderOption setting
					return (this.opts.placeholderOption === "first" && firstOption) ||
						(typeof this.opts.placeholderOption === "function" && this.opts.placeholderOption(this.select));
				} else if (firstOption.text() === "" && firstOption.val() === "") {
					//No explicit placeholder option specified, use the first if it's blank
					return firstOption;
				}
			}
		},

		/**
		 * Get the desired width for the container element.  This is
		 * derived first from option `width` passed to select2, then
		 * the inline 'style' on the original element, and finally
		 * falls back to the jQuery calculated element width.
		 */
		// abstract
		initContainerWidth: function () {
			function resolveContainerWidth() {
				var style, attrs, matches, i, l, attr;

				if (this.opts.width === "off") {
					return null;
				} else if (this.opts.width === "element") {
					return this.opts.element.outerWidth(false) === 0 ? 'auto' : this.opts.element.outerWidth(false) + 'px';
				} else if (this.opts.width === "copy" || this.opts.width === "resolve") {
					// check if there is inline style on the element that contains width
					style = this.opts.element.attr('style');
					if (style !== undefined) {
						attrs = style.split(';');
						for (i = 0, l = attrs.length; i < l; i = i + 1) {
							attr = attrs[i].replace(/\s/g, '');
							matches = attr.match(/^width:(([-+]?([0-9]*\.)?[0-9]+)(px|em|ex|%|in|cm|mm|pt|pc))/i);
							if (matches !== null && matches.length >= 1)
								return matches[1];
						}
					}

					if (this.opts.width === "resolve") {
						// next check if css('width') can resolve a width that is percent based, this is sometimes possible
						// when attached to input type=hidden or elements hidden via css
						style = this.opts.element.css('width');
						if (style.indexOf("%") > 0) return style;

						// finally, fallback on the calculated width of the element
						return (this.opts.element.outerWidth(false) === 0 ? 'auto' : this.opts.element.outerWidth(false) + 'px');
					}

					return null;
				} else if ($.isFunction(this.opts.width)) {
					return this.opts.width();
				} else {
					return this.opts.width;
				}
			};

			var width = resolveContainerWidth.call(this);
			if (width !== null) {
				this.container.css("width", width);
			}
		}
	});

	SingleSelect2 = clazz(AbstractSelect2, {

		// single

		createContainer: function () {
			var container = $(document.createElement("div")).attr({
																	  "class": "select2-container"
																  }).html([
																			  "<a href='javascript:void(0)' onclick='return false;' class='select2-choice' tabindex='-1'>",
																			  "   <span class='select2-chosen'>&nbsp;</span><abbr class='select2-search-choice-close'></abbr>",
																			  "   <span class='select2-arrow'><b></b></span>",
																			  "</a>",
																			  "<input class='select2-focusser select2-offscreen' type='text'/>",
																			  "<div class='select2-drop select2-display-none'>",
																			  "   <div class='select2-search'>",
																			  "       <input type='text' autocomplete='off' autocorrect='off' autocapitalize='off' spellcheck='false' class='select2-input'/>",
																			  "   </div>",
																			  "   <ul class='select2-results'>",
																			  "   </ul>",
																			  "</div>"].join(""));
			return container;
		},

		// single
		enableInterface: function () {
			if (this.parent.enableInterface.apply(this, arguments)) {
				this.focusser.prop("disabled", !this.isInterfaceEnabled());
			}
		},

		// single
		opening: function () {
			var el, range, len;

			if (this.opts.minimumResultsForSearch >= 0) {
				this.showSearch(true);
			}

			this.parent.opening.apply(this, arguments);

			if (this.showSearchInput !== false) {
				// IE appends focusser.val() at the end of field :/ so we manually insert it at the beginning using a range
				// all other browsers handle this just fine

				this.search.val(this.focusser.val());
			}
			this.search.focus();
			// move the cursor to the end after focussing, otherwise it will be at the beginning and
			// new text will appear *before* focusser.val()
			el = this.search.get(0);
			if (el.createTextRange) {
				range = el.createTextRange();
				range.collapse(false);
				range.select();
			} else if (el.setSelectionRange) {
				len = this.search.val().length;
				el.setSelectionRange(len, len);
			}

			// initializes search's value with nextSearchTerm (if defined by user)
			// ignore nextSearchTerm if the dropdown is opened by the user pressing a letter
			if (this.search.val() === "") {
				if (this.nextSearchTerm != undefined) {
					this.search.val(this.nextSearchTerm);
					this.search.select();
				}
			}

			this.focusser.prop("disabled", true).val("");
			this.updateResults(true);
			this.opts.element.trigger($.Event("select2-open"));
		},

		// single
		close: function (params) {
			if (!this.opened()) return;
			this.parent.close.apply(this, arguments);

			params = params || {focus: true};
			this.focusser.removeAttr("disabled");

			if (params.focus) {
				this.focusser.focus();
			}
		},

		// single
		focus: function () {
			if (this.opened()) {
				this.close();
			} else {
				this.focusser.removeAttr("disabled");
				this.focusser.focus();
			}
		},

		// single
		isFocused: function () {
			return this.container.hasClass("select2-container-active");
		},

		// single
		cancel: function () {
			this.parent.cancel.apply(this, arguments);
			this.focusser.removeAttr("disabled");
			this.focusser.focus();
		},

		// single
		destroy: function () {
			$("label[for='" + this.focusser.attr('id') + "']")
				.attr('for', this.opts.element.attr("id"));
			this.parent.destroy.apply(this, arguments);
		},

		// single
		initContainer: function () {

			var selection,
				container = this.container,
				dropdown = this.dropdown;

			if (this.opts.minimumResultsForSearch < 0) {
				this.showSearch(false);
			} else {
				this.showSearch(true);
			}

			this.selection = selection = container.find(".select2-choice");

			this.focusser = container.find(".select2-focusser");

			// rewrite labels from original element to focusser
			this.focusser.attr("id", "s2id_autogen" + nextUid());

			$("label[for='" + this.opts.element.attr("id") + "']")
				.attr('for', this.focusser.attr('id'));

			this.focusser.attr("tabindex", this.elementTabIndex);

			this.search.on("keydown", this.bind(function (e) {
				if (!this.isInterfaceEnabled()) return;

				if (e.which === KEY.PAGE_UP || e.which === KEY.PAGE_DOWN) {
					// prevent the page from scrolling
					killEvent(e);
					return;
				}

				switch (e.which) {
					case KEY.UP:
					case KEY.DOWN:
						this.moveHighlight((e.which === KEY.UP) ? -1 : 1);
						killEvent(e);
						return;
					case KEY.ENTER:
						this.selectHighlighted();
						killEvent(e);
						return;
					case KEY.TAB:
						this.selectHighlighted({noFocus: true});
						return;
					case KEY.ESC:
						this.cancel(e);
						killEvent(e);
						return;
				}
			}));

			this.search.on("blur", this.bind(function (e) {
				// a workaround for chrome to keep the search field focussed when the scroll bar is used to scroll the dropdown.
				// without this the search field loses focus which is annoying
				if (document.activeElement === this.body().get(0)) {
					window.setTimeout(this.bind(function () {
						this.search.focus();
					}), 0);
				}
			}));

			this.focusser.on("keydown", this.bind(function (e) {
				if (!this.isInterfaceEnabled()) return;

				if (e.which === KEY.TAB || KEY.isControl(e) || KEY.isFunctionKey(e) || e.which === KEY.ESC) {
					return;
				}

				if (this.opts.openOnEnter === false && e.which === KEY.ENTER) {
					killEvent(e);
					return;
				}

				if (e.which == KEY.DOWN || e.which == KEY.UP
					|| (e.which == KEY.ENTER && this.opts.openOnEnter)) {

					if (e.altKey || e.ctrlKey || e.shiftKey || e.metaKey) return;

					this.open();
					killEvent(e);
					return;
				}

				if (e.which == KEY.DELETE || e.which == KEY.BACKSPACE) {
					if (this.opts.allowClear) {
						this.clear();
					}
					killEvent(e);
					return;
				}
			}));


			installKeyUpChangeEvent(this.focusser);
			this.focusser.on("keyup-change input", this.bind(function (e) {
				if (this.opts.minimumResultsForSearch >= 0) {
					e.stopPropagation();
					if (this.opened()) return;
					this.open();
				}
			}));

			selection.on("mousedown", "abbr", this.bind(function (e) {
				if (!this.isInterfaceEnabled()) return;
				this.clear();
				killEventImmediately(e);
				this.close();
				this.selection.focus();
			}));

			selection.on("mousedown", this.bind(function (e) {

				if (!this.container.hasClass("select2-container-active")) {
					this.opts.element.trigger($.Event("select2-focus"));
				}

				if (this.opened()) {
					this.close();
				} else if (this.isInterfaceEnabled()) {
					this.open();
				}

				killEvent(e);
			}));

			dropdown.on("mousedown", this.bind(function () {
				this.search.focus();
			}));

			selection.on("focus", this.bind(function (e) {
				killEvent(e);
			}));

			this.focusser.on("focus", this.bind(function () {
					if (!this.container.hasClass("select2-container-active")) {
						this.opts.element.trigger($.Event("select2-focus"));
					}
					this.container.addClass("select2-container-active");
				})).on("blur", this.bind(function () {
					if (!this.opened()) {
						this.container.removeClass("select2-container-active");
						this.opts.element.trigger($.Event("select2-blur"));
					}
				}));
			this.search.on("focus", this.bind(function () {
				if (!this.container.hasClass("select2-container-active")) {
					this.opts.element.trigger($.Event("select2-focus"));
				}
				this.container.addClass("select2-container-active");
			}));

			this.initContainerWidth();
			this.opts.element.addClass("select2-offscreen");
			this.setPlaceholder();

		},

		// single
		clear: function (triggerChange) {
			var data = this.selection.data("select2-data");
			if (data) { // guard against queued quick consecutive clicks
				var evt = $.Event("select2-clearing");
				this.opts.element.trigger(evt);
				if (evt.isDefaultPrevented()) {
					return;
				}
				var placeholderOption = this.getPlaceholderOption();
				this.opts.element.val(placeholderOption ? placeholderOption.val() : "");
				this.selection.find(".select2-chosen").empty();
				this.selection.removeData("select2-data");
				this.setPlaceholder();

				if (triggerChange !== false) {
					this.opts.element.trigger({ type: "select2-removed", val: this.id(data), choice: data });
					this.triggerChange({removed: data});
				}
			}
		},

		/**
		 * Sets selection based on source element's value
		 */
		// single
		initSelection: function () {
			var selected;
			if (this.isPlaceholderOptionSelected()) {
				this.updateSelection(null);
				this.close();
				this.setPlaceholder();
			} else {
				var self = this;
				this.opts.initSelection.call(null, this.opts.element, function (selected) {
					if (selected !== undefined && selected !== null) {
						self.updateSelection(selected);
						self.close();
						self.setPlaceholder();
					}
				});
			}
		},

		isPlaceholderOptionSelected: function () {
			var placeholderOption;
			if (!this.getPlaceholder()) return false; // no placeholder specified so no option should be considered
			return ((placeholderOption = this.getPlaceholderOption()) !== undefined && placeholderOption.prop("selected"))
				|| (this.opts.element.val() === "")
				|| (this.opts.element.val() === undefined)
				|| (this.opts.element.val() === null);
		},

		// single
		prepareOpts: function () {
			var opts = this.parent.prepareOpts.apply(this, arguments),
				self = this;

			if (opts.element.get(0).tagName.toLowerCase() === "select") {
				// install the selection initializer
				opts.initSelection = function (element, callback) {
					var selected = element.find("option").filter(function () {
						return this.selected
					});
					// a single select box always has a value, no need to null check 'selected'
					callback(self.optionToData(selected));
				};
			} else if ("data" in opts) {
				// install default initSelection when applied to hidden input and data is local
				opts.initSelection = opts.initSelection || function (element, callback) {
					var id = element.val();
					//search in data by id, storing the actual matching item
					var match = null;
					opts.query({
								   matcher: function (term, text, el) {
									   var is_match = equal(id, opts.id(el));
									   if (is_match) {
										   match = el;
									   }
									   return is_match;
								   },
								   callback: !$.isFunction(callback) ? $.noop : function () {
									   callback(match);
								   }
							   });
				};
			}

			return opts;
		},

		// single
		getPlaceholder: function () {
			// if a placeholder is specified on a single select without a valid placeholder option ignore it
			if (this.select) {
				if (this.getPlaceholderOption() === undefined) {
					return undefined;
				}
			}

			return this.parent.getPlaceholder.apply(this, arguments);
		},

		// single
		setPlaceholder: function () {
			var placeholder = this.getPlaceholder();

			if (this.isPlaceholderOptionSelected() && placeholder !== undefined) {

				// check for a placeholder option if attached to a select
				if (this.select && this.getPlaceholderOption() === undefined) return;

				this.selection.find(".select2-chosen").html(this.opts.escapeMarkup(placeholder));

				this.selection.addClass("select2-default");

				this.container.removeClass("select2-allowclear");
			}
		},

		// single
		postprocessResults: function (data, initial, noHighlightUpdate) {
			var selected = 0, self = this, showSearchInput = true;

			// find the selected element in the result list

			this.findHighlightableChoices().each2(function (i, elm) {
				if (equal(self.id(elm.data("select2-data")), self.opts.element.val())) {
					selected = i;
					return false;
				}
			});

			// and highlight it
			if (noHighlightUpdate !== false) {
				if (initial === true && selected >= 0) {
					this.highlight(selected);
				} else {
					this.highlight(0);
				}
			}

			// hide the search box if this is the first we got the results and there are enough of them for search

			if (initial === true) {
				var min = this.opts.minimumResultsForSearch;
				if (min >= 0) {
					this.showSearch(countResults(data.results) >= min);
				}
			}
		},

		// single
		showSearch: function (showSearchInput) {
			if (this.showSearchInput === showSearchInput) return;

			this.showSearchInput = showSearchInput;

			this.dropdown.find(".select2-search").toggleClass("select2-search-hidden", !showSearchInput);
			this.dropdown.find(".select2-search").toggleClass("select2-offscreen", !showSearchInput);
			//add "select2-with-searchbox" to the container if search box is shown
			$(this.dropdown, this.container).toggleClass("select2-with-searchbox", showSearchInput);
		},

		// single
		onSelect: function (data, options) {

			if (!this.triggerSelect(data)) {
				return;
			}

			var old = this.opts.element.val(),
				oldData = this.data();

			this.opts.element.val(this.id(data));
			this.updateSelection(data);

			this.opts.element.trigger({ type: "select2-selected", val: this.id(data), choice: data });

			this.nextSearchTerm = this.opts.nextSearchTerm(data, this.search.val());
			this.close();

			if (!options || !options.noFocus)
				this.focusser.focus();

			if (!equal(old, this.id(data))) {
				this.triggerChange({added: data, removed: oldData});
			}
		},

		// single
		updateSelection: function (data) {

			var container = this.selection.find(".select2-chosen"), formatted, cssClass;

			this.selection.data("select2-data", data);

			container.empty();
			if (data !== null) {
				formatted = this.opts.formatSelection(data, container, this.opts.escapeMarkup);
			}
			if (formatted !== undefined) {
				container.append(formatted);
			}
			cssClass = this.opts.formatSelectionCssClass(data, container);
			if (cssClass !== undefined) {
				container.addClass(cssClass);
			}

			this.selection.removeClass("select2-default");

			if (this.opts.allowClear && this.getPlaceholder() !== undefined) {
				this.container.addClass("select2-allowclear");
			}
		},

		// single
		val: function () {
			var val,
				triggerChange = false,
				data = null,
				self = this,
				oldData = this.data();

			if (arguments.length === 0) {
				return this.opts.element.val();
			}

			val = arguments[0];

			if (arguments.length > 1) {
				triggerChange = arguments[1];
			}

			if (this.select) {
				this.select
					.val(val)
					.find("option").filter(function () {
											   return this.selected
										   }).each2(function (i, elm) {
														data = self.optionToData(elm);
														return false;
													});
				this.updateSelection(data);
				this.setPlaceholder();
				if (triggerChange) {
					this.triggerChange({added: data, removed: oldData});
				}
			} else {
				// val is an id. !val is true for [undefined,null,'',0] - 0 is legal
				if (!val && val !== 0) {
					this.clear(triggerChange);
					return;
				}
				if (this.opts.initSelection === undefined) {
					throw new Error("cannot call val() if initSelection() is not defined");
				}
				this.opts.element.val(val);
				this.opts.initSelection(this.opts.element, function (data) {
					self.opts.element.val(!data ? "" : self.id(data));
					self.updateSelection(data);
					self.setPlaceholder();
					if (triggerChange) {
						self.triggerChange({added: data, removed: oldData});
					}
				});
			}
		},

		// single
		clearSearch: function () {
			this.search.val("");
			this.focusser.val("");
		},

		// single
		data: function (value) {
			var data,
				triggerChange = false;

			if (arguments.length === 0) {
				data = this.selection.data("select2-data");
				if (data == undefined) data = null;
				return data;
			} else {
				if (arguments.length > 1) {
					triggerChange = arguments[1];
				}
				if (!value) {
					this.clear(triggerChange);
				} else {
					data = this.data();
					this.opts.element.val(!value ? "" : this.id(value));
					this.updateSelection(value);
					if (triggerChange) {
						this.triggerChange({added: value, removed: data});
					}
				}
			}
		}
	});

	MultiSelect2 = clazz(AbstractSelect2, {

		// multi
		createContainer: function () {
			var container = $(document.createElement("div")).attr({
																	  "class": "select2-container select2-container-multi"
																  }).html([
																			  "<ul class='select2-choices'>",
																			  "  <li class='select2-search-field'>",
																			  "    <input type='text' autocomplete='off' autocorrect='off' autocapitalize='off' spellcheck='false' class='select2-input'>",
																			  "  </li>",
																			  "  <span class='select2-arrow'><b></b></span>",
																			  "</ul>",
																			  "<div class='select2-drop select2-drop-multi select2-display-none'>",
																			  "   <ul class='select2-results'>",
																			  "   </ul>",
																			  "</div>"].join(""));
			return container;
		},

		// multi
		prepareOpts: function () {
			var opts = this.parent.prepareOpts.apply(this, arguments),
				self = this;

			// TODO validate placeholder is a string if specified

			if (opts.element.get(0).tagName.toLowerCase() === "select") {
				// install sthe selection initializer
				opts.initSelection = function (element, callback) {

					var data = [];

					element.find("option").filter(function () {
						return this.selected
					}).each2(function (i, elm) {
						data.push(self.optionToData(elm));
					});
					callback(data);
				};
			} else if ("data" in opts) {
				// install default initSelection when applied to hidden input and data is local
				opts.initSelection = opts.initSelection || function (element, callback) {
					var ids = splitVal(element.val(), opts.separator);
					//search in data by array of ids, storing matching items in a list
					var matches = [];
					opts.query({
								   matcher: function (term, text, el) {
									   var is_match = $.grep(ids,function (id) {
										   return equal(id, opts.id(el));
									   }).length;
									   if (is_match) {
										   matches.push(el);
									   }
									   return is_match;
								   },
								   callback: !$.isFunction(callback) ? $.noop : function () {
									   // reorder matches based on the order they appear in the ids array because right now
									   // they are in the order in which they appear in data array
									   var ordered = [];
									   for (var i = 0; i < ids.length; i++) {
										   var id = ids[i];
										   for (var j = 0; j < matches.length; j++) {
											   var match = matches[j];
											   if (equal(id, opts.id(match))) {
												   ordered.push(match);
												   matches.splice(j, 1);
												   break;
											   }
										   }
									   }
									   callback(ordered);
								   }
							   });
				};
			}

			return opts;
		},

		// multi
		selectChoice: function (choice) {

			var selected = this.container.find(".select2-search-choice-focus");
			if (selected.length && choice && choice[0] == selected[0]) {

			} else {
				if (selected.length) {
					this.opts.element.trigger("choice-deselected", selected);
				}
				selected.removeClass("select2-search-choice-focus");
				if (choice && choice.length) {
					this.close();
					choice.addClass("select2-search-choice-focus");
					this.opts.element.trigger("choice-selected", choice);
				}
			}
		},

		// multi
		destroy: function () {
			$("label[for='" + this.search.attr('id') + "']")
				.attr('for', this.opts.element.attr("id"));
			this.parent.destroy.apply(this, arguments);
		},

		// multi
		initContainer: function () {

			var selector = ".select2-choices", selection;

			this.searchContainer = this.container.find(".select2-search-field");
			this.selection = selection = this.container.find(selector);

			var _this = this;
			this.selection.on("click", ".select2-search-choice:not(.select2-locked)", function (e) {
				//killEvent(e);
				_this.search[0].focus();
				_this.selectChoice($(this));
			});

			// rewrite labels from original element to focusser
			this.search.attr("id", "s2id_autogen" + nextUid());
			$("label[for='" + this.opts.element.attr("id") + "']")
				.attr('for', this.search.attr('id'));

			this.search.on("input paste", this.bind(function () {
				if (!this.isInterfaceEnabled()) return;
				if (!this.opened()) {
					this.open();
				}
			}));

			this.search.attr("tabindex", this.elementTabIndex);

			this.keydowns = 0;
			this.search.on("keydown", this.bind(function (e) {
				if (!this.isInterfaceEnabled()) return;

				++this.keydowns;
				var selected = selection.find(".select2-search-choice-focus");
				var prev = selected.prev(".select2-search-choice:not(.select2-locked)");
				var next = selected.next(".select2-search-choice:not(.select2-locked)");
				var pos = getCursorInfo(this.search);

				if (selected.length &&
					(e.which == KEY.LEFT || e.which == KEY.RIGHT || e.which == KEY.BACKSPACE || e.which == KEY.DELETE || e.which == KEY.ENTER)) {
					var selectedChoice = selected;
					if (e.which == KEY.LEFT && prev.length) {
						selectedChoice = prev;
					}
					else if (e.which == KEY.RIGHT) {
						selectedChoice = next.length ? next : null;
					}
					else if (e.which === KEY.BACKSPACE) {
						this.unselect(selected.first());
						this.search.width(10);
						selectedChoice = prev.length ? prev : next;
					} else if (e.which == KEY.DELETE) {
						this.unselect(selected.first());
						this.search.width(10);
						selectedChoice = next.length ? next : null;
					} else if (e.which == KEY.ENTER) {
						selectedChoice = null;
					}

					this.selectChoice(selectedChoice);
					killEvent(e);
					if (!selectedChoice || !selectedChoice.length) {
						this.open();
					}
					return;
				} else if (((e.which === KEY.BACKSPACE && this.keydowns == 1)
					|| e.which == KEY.LEFT) && (pos.offset == 0 && !pos.length)) {

					this.selectChoice(selection.find(".select2-search-choice:not(.select2-locked)").last());
					killEvent(e);
					return;
				} else {
					this.selectChoice(null);
				}

				if (this.opened()) {
					switch (e.which) {
						case KEY.UP:
						case KEY.DOWN:
							this.moveHighlight((e.which === KEY.UP) ? -1 : 1);
							killEvent(e);
							return;
						case KEY.ENTER:
							this.selectHighlighted();
							killEvent(e);
							return;
						case KEY.TAB:
							this.selectHighlighted({noFocus: true});
							this.close();
							return;
						case KEY.ESC:
							this.cancel(e);
							killEvent(e);
							return;
					}
				}

				if (e.which === KEY.TAB || KEY.isControl(e) || KEY.isFunctionKey(e)
					|| e.which === KEY.BACKSPACE || e.which === KEY.ESC) {
					return;
				}

				if (e.which === KEY.ENTER) {
					if (this.opts.openOnEnter === false) {
						return;
					} else if (e.altKey || e.ctrlKey || e.shiftKey || e.metaKey) {
						return;
					}
				}

				this.open();

				if (e.which === KEY.PAGE_UP || e.which === KEY.PAGE_DOWN) {
					// prevent the page from scrolling
					killEvent(e);
				}

				if (e.which === KEY.ENTER) {
					// prevent form from being submitted
					killEvent(e);
				}

			}));

			this.search.on("keyup", this.bind(function (e) {
				this.keydowns = 0;
				this.resizeSearch();
			})
			);

			this.search.on("blur", this.bind(function (e) {
				this.container.removeClass("select2-container-active");
				this.search.removeClass("select2-focused");
				this.selectChoice(null);
				if (!this.opened()) this.clearSearch();
				e.stopImmediatePropagation();
				this.opts.element.trigger($.Event("select2-blur"));
			}));

			this.container.on("click", selector, this.bind(function (e) {
				if (!this.isInterfaceEnabled()) return;
				if ($(e.target).closest(".select2-search-choice").length > 0) {
					// clicked inside a select2 search choice, do not open
					return;
				}
				this.selectChoice(null);
				this.clearPlaceholder();
				if (!this.container.hasClass("select2-container-active")) {
					this.opts.element.trigger($.Event("select2-focus"));
				}
				this.open();
				this.focusSearch();
				e.preventDefault();
			}));

			this.container.on("focus", selector, this.bind(function () {
				if (!this.isInterfaceEnabled()) return;
				if (!this.container.hasClass("select2-container-active")) {
					this.opts.element.trigger($.Event("select2-focus"));
				}
				this.container.addClass("select2-container-active");
				this.dropdown.addClass("select2-drop-active");
				this.clearPlaceholder();
			}));

			this.initContainerWidth();
			this.opts.element.addClass("select2-offscreen");

			// set the placeholder if necessary
			this.clearSearch();
		},

		// multi
		enableInterface: function () {
			if (this.parent.enableInterface.apply(this, arguments)) {
				this.search.prop("disabled", !this.isInterfaceEnabled());
			}
		},

		// multi
		initSelection: function () {
			var data;
			if (this.opts.element.val() === "" && this.opts.element.text() === "") {
				this.updateSelection([]);
				this.close();
				// set the placeholder if necessary
				this.clearSearch();
			}
			if (this.select || this.opts.element.val() !== "") {
				var self = this;
				this.opts.initSelection.call(null, this.opts.element, function (data) {
					if (data !== undefined && data !== null) {
						self.updateSelection(data);
						self.close();
						// set the placeholder if necessary
						self.clearSearch();
					}
				});
			}
		},

		// multi
		clearSearch: function () {
			var placeholder = this.getPlaceholder(),
				maxWidth = this.getMaxSearchWidth();

			if (placeholder !== undefined && this.getVal().length === 0 && this.search.hasClass("select2-focused") === false) {
				this.search.val(placeholder).addClass("select2-default");
				// stretch the search box to full width of the container so as much of the placeholder is visible as possible
				// we could call this.resizeSearch(), but we do not because that requires a sizer and we do not want to create one so early because of a firefox bug, see #944
				this.search.width(maxWidth > 0 ? maxWidth : this.container.css("width"));
			} else {
				this.search.val("").width(10);
			}
		},

		// multi
		clearPlaceholder: function () {
			if (this.search.hasClass("select2-default")) {
				this.search.val("").removeClass("select2-default");
			}
		},

		// multi
		opening: function () {
			this.clearPlaceholder(); // should be done before super so placeholder is not used to search
			this.resizeSearch();

			this.parent.opening.apply(this, arguments);

			this.focusSearch();

			this.updateResults(true);
			this.search.focus();
			this.opts.element.trigger($.Event("select2-open"));
		},

		// multi
		close: function () {
			if (!this.opened()) return;
			this.parent.close.apply(this, arguments);
		},

		// multi
		focus: function () {
			this.close();
			this.search.focus();
		},

		// multi
		isFocused: function () {
			return this.search.hasClass("select2-focused");
		},

		// multi
		updateSelection: function (data) {
			var ids = [], filtered = [], self = this;

			// filter out duplicates
			$(data).each(function () {
				if (indexOf(self.id(this), ids) < 0) {
					ids.push(self.id(this));
					filtered.push(this);
				}
			});
			data = filtered;

			this.selection.find(".select2-search-choice").remove();
			$(data).each(function () {
				self.addSelectedChoice(this);
			});
			self.postprocessResults();
		},

		// multi
		tokenize: function () {
			var input = this.search.val();
			input = this.opts.tokenizer.call(this, input, this.data(), this.bind(this.onSelect), this.opts);
			if (input != null && input != undefined) {
				this.search.val(input);
				if (input.length > 0) {
					this.open();
				}
			}

		},

		// multi
		onSelect: function (data, options) {

			if (!this.triggerSelect(data)) {
				return;
			}

			this.addSelectedChoice(data);

			this.opts.element.trigger({ type: "selected", val: this.id(data), choice: data });

			if (this.select || !this.opts.closeOnSelect) this.postprocessResults(data, false, this.opts.closeOnSelect === true);

			if (this.opts.closeOnSelect) {
				this.close();
				this.search.width(10);
			} else {
				if (this.countSelectableResults() > 0) {
					this.search.width(10);
					this.resizeSearch();
					if (this.getMaximumSelectionSize() > 0 && this.val().length >= this.getMaximumSelectionSize()) {
						// if we reached max selection size repaint the results so choices
						// are replaced with the max selection reached message
						this.updateResults(true);
					}
					this.positionDropdown();
				} else {
					// if nothing left to select close
					this.close();
					this.search.width(10);
				}
			}

			// since its not possible to select an element that has already been
			// added we do not need to check if this is a new element before firing change
			this.triggerChange({ added: data });

			if (!options || !options.noFocus)
				this.focusSearch();
		},

		// multi
		cancel: function () {
			this.close();
			this.focusSearch();
		},

		addSelectedChoice: function (data) {
			var enableChoice = !data.locked,
				enabledItem = $(
					"<li class='select2-search-choice'>" +
						"    <div></div>" +
						"    <a href='#' onclick='return false;' class='select2-search-choice-close' tabindex='-1'></a>" +
						"</li>"),
				disabledItem = $(
					"<li class='select2-search-choice select2-locked'>" +
						"<div></div>" +
						"</li>");
			var choice = enableChoice ? enabledItem : disabledItem,
				id = this.id(data),
				val = this.getVal(),
				formatted,
				cssClass;

			formatted = this.opts.formatSelection(data, choice.find("div"), this.opts.escapeMarkup);
			if (formatted != undefined) {
				choice.find("div").replaceWith("<div>" + formatted + "</div>");
			}
			cssClass = this.opts.formatSelectionCssClass(data, choice.find("div"));
			if (cssClass != undefined) {
				choice.addClass(cssClass);
			}

			if (enableChoice) {
				choice.find(".select2-search-choice-close")
					.on("mousedown", killEvent)
					.on("click dblclick", this.bind(function (e) {
						if (!this.isInterfaceEnabled()) return;

						$(e.target).closest(".select2-search-choice").fadeOut('fast', this.bind(function () {
							this.unselect($(e.target));
							this.selection.find(".select2-search-choice-focus").removeClass("select2-search-choice-focus");
							this.close();
							this.focusSearch();
						})).dequeue();
						killEvent(e);
					})).on("focus", this.bind(function () {
						if (!this.isInterfaceEnabled()) return;
						this.container.addClass("select2-container-active");
						this.dropdown.addClass("select2-drop-active");
					}));
			}

			choice.data("select2-data", data);
			choice.insertBefore(this.searchContainer);

			val.push(id);
			this.setVal(val);
		},

		// multi
		unselect: function (selected) {
			var val = this.getVal(),
				data,
				index;
			selected = selected.closest(".select2-search-choice");

			if (selected.length === 0) {
				throw "Invalid argument: " + selected + ". Must be .select2-search-choice";
			}

			data = selected.data("select2-data");

			if (!data) {
				// prevent a race condition when the 'x' is clicked really fast repeatedly the event can be queued
				// and invoked on an element already removed
				return;
			}

			while ((index = indexOf(this.id(data), val)) >= 0) {
				val.splice(index, 1);
				this.setVal(val);
				if (this.select) this.postprocessResults();
			}

			var evt = $.Event("select2-removing");
			evt.val = this.id(data);
			evt.choice = data;
			this.opts.element.trigger(evt);

			if (evt.isDefaultPrevented()) {
				return;
			}

			selected.remove();

			this.opts.element.trigger({ type: "select2-removed", val: this.id(data), choice: data });
			this.triggerChange({ removed: data });
		},

		// multi
		postprocessResults: function (data, initial, noHighlightUpdate) {
			var val = this.getVal(),
				choices = this.results.find(".select2-result"),
				compound = this.results.find(".select2-result-with-children"),
				self = this;

			choices.each2(function (i, choice) {
				var id = self.id(choice.data("select2-data"));
				if (indexOf(id, val) >= 0) {
					choice.addClass("select2-selected");
					// mark all children of the selected parent as selected
					choice.find(".select2-result-selectable").addClass("select2-selected");
				}
			});

			compound.each2(function (i, choice) {
				// hide an optgroup if it doesnt have any selectable children
				if (!choice.is('.select2-result-selectable')
					&& choice.find(".select2-result-selectable:not(.select2-selected)").length === 0) {
					choice.addClass("select2-selected");
				}
			});

			if (this.highlight() == -1 && noHighlightUpdate !== false) {
				self.highlight(0);
			}

			//If all results are chosen render formatNoMAtches
			if (!this.opts.createSearchChoice && !choices.filter('.select2-result:not(.select2-selected)').length > 0) {
				if (!data || data && !data.more && this.results.find(".select2-no-results").length === 0) {
					if (checkFormatter(self.opts.formatNoMatches, "formatNoMatches")) {
						this.results.append("<li class='select2-no-results'>" + self.opts.formatNoMatches(self.search.val()) + "</li>");
					}
				}
			}

		},

		// multi
		getMaxSearchWidth: function () {
			return this.selection.width() - getSideBorderPadding(this.search);
		},

		// multi
		resizeSearch: function () {
			var minimumWidth, left, maxWidth, containerLeft, searchWidth,
				sideBorderPadding = getSideBorderPadding(this.search);

			minimumWidth = measureTextWidth(this.search) + 10;

			left = this.search.offset().left;

			maxWidth = this.selection.width();
			containerLeft = this.selection.offset().left;

			searchWidth = maxWidth - (left - containerLeft) - sideBorderPadding;

			if (searchWidth < minimumWidth) {
				searchWidth = maxWidth - sideBorderPadding;
			}

			if (searchWidth < 40) {
				searchWidth = maxWidth - sideBorderPadding;
			}

			if (searchWidth <= 0) {
				searchWidth = minimumWidth;
			}

			this.search.width(Math.floor(searchWidth));
		},

		// multi
		getVal: function () {
			var val;
			if (this.select) {
				val = this.select.val();
				return val === null ? [] : val;
			} else {
				val = this.opts.element.val();
				return splitVal(val, this.opts.separator);
			}
		},

		// multi
		setVal: function (val) {
			var unique;
			if (this.select) {
				this.select.val(val);
			} else {
				unique = [];
				// filter out duplicates
				$(val).each(function () {
					if (indexOf(this, unique) < 0) unique.push(this);
				});
				this.opts.element.val(unique.length === 0 ? "" : unique.join(this.opts.separator));
			}
		},

		// multi
		buildChangeDetails: function (old, current) {
			var current = current.slice(0),
				old = old.slice(0);

			// remove intersection from each array
			for (var i = 0; i < current.length; i++) {
				for (var j = 0; j < old.length; j++) {
					if (equal(this.opts.id(current[i]), this.opts.id(old[j]))) {
						current.splice(i, 1);
						if (i > 0) {
							i--;
						}
						old.splice(j, 1);
						j--;
					}
				}
			}

			return {added: current, removed: old};
		},


		// multi
		val: function (val, triggerChange) {
			var oldData, self = this;

			if (arguments.length === 0) {
				return this.getVal();
			}

			oldData = this.data();
			if (!oldData.length) oldData = [];

			// val is an id. !val is true for [undefined,null,'',0] - 0 is legal
			if (!val && val !== 0) {
				this.opts.element.val("");
				this.updateSelection([]);
				this.clearSearch();
				if (triggerChange) {
					this.triggerChange({added: this.data(), removed: oldData});
				}
				return;
			}

			// val is a list of ids
			this.setVal(val);

			if (this.select) {
				this.opts.initSelection(this.select, this.bind(this.updateSelection));
				if (triggerChange) {
					this.triggerChange(this.buildChangeDetails(oldData, this.data()));
				}
			} else {
				if (this.opts.initSelection === undefined) {
					throw new Error("val() cannot be called if initSelection() is not defined");
				}

				this.opts.initSelection(this.opts.element, function (data) {
					var ids = $.map(data, self.id);
					self.setVal(ids);
					self.updateSelection(data);
					self.clearSearch();
					if (triggerChange) {
						self.triggerChange(self.buildChangeDetails(oldData, self.data()));
					}
				});
			}
			this.clearSearch();
		},

		// multi
		onSortStart: function () {
			if (this.select) {
				throw new Error("Sorting of elements is not supported when attached to <select>. Attach to <input type='hidden'/> instead.");
			}

			// collapse search field into 0 width so its container can be collapsed as well
			this.search.width(0);
			// hide the container
			this.searchContainer.hide();
		},

		// multi
		onSortEnd: function () {

			var val = [], self = this;

			// show search and move it to the end of the list
			this.searchContainer.show();
			// make sure the search container is the last item in the list
			this.searchContainer.appendTo(this.searchContainer.parent());
			// since we collapsed the width in dragStarted, we resize it here
			this.resizeSearch();

			// update selection
			this.selection.find(".select2-search-choice").each(function () {
				val.push(self.opts.id($(this).data("select2-data")));
			});
			this.setVal(val);
			this.triggerChange();
		},

		// multi
		data: function (values, triggerChange) {
			var self = this, ids, old;
			if (arguments.length === 0) {
				return this.selection
					.find(".select2-search-choice")
					.map(function () {
							 return $(this).data("select2-data");
						 })
					.get();
			} else {
				old = this.data();
				if (!values) {
					values = [];
				}
				ids = $.map(values, function (e) {
					return self.opts.id(e);
				});
				this.setVal(ids);
				this.updateSelection(values);
				this.clearSearch();
				if (triggerChange) {
					this.triggerChange(this.buildChangeDetails(old, this.data()));
				}
			}
		}
	});

	$.fn.select2 = function () {

		var args = Array.prototype.slice.call(arguments, 0),
			opts,
			select2,
			method, value, multiple,
			allowedMethods = ["val", "destroy", "opened", "open", "close", "focus", "isFocused", "container", "dropdown", "onSortStart", "onSortEnd", "enable", "disable", "readonly", "positionDropdown", "data", "search"],
			valueMethods = ["opened", "isFocused", "container", "dropdown"],
			propertyMethods = ["val", "data"],
			methodsMap = { search: "externalSearch" };

		this.each(function () {
			if (args.length === 0 || typeof(args[0]) === "object") {
				opts = args.length === 0 ? {} : $.extend({}, args[0]);
				opts.element = $(this);

				if (opts.element.get(0).tagName.toLowerCase() === "select") {
					multiple = opts.element.prop("multiple");
				} else {
					multiple = opts.multiple || false;
					if ("tags" in opts) {
						opts.multiple = multiple = true;
					}
				}

				select2 = multiple ? new MultiSelect2() : new SingleSelect2();
				select2.init(opts);
			} else if (typeof(args[0]) === "string") {

				if (indexOf(args[0], allowedMethods) < 0) {
					throw "Unknown method: " + args[0];
				}

				value = undefined;
				select2 = $(this).data("select2");
				if (select2 === undefined) return;

				method = args[0];

				if (method === "container") {
					value = select2.container;
				} else if (method === "dropdown") {
					value = select2.dropdown;
				} else {
					if (methodsMap[method]) method = methodsMap[method];

					value = select2[method].apply(select2, args.slice(1));
				}
				if (indexOf(args[0], valueMethods) >= 0
					|| (indexOf(args[0], propertyMethods) && args.length == 1)) {
					return false; // abort the iteration, ready to return first matched value
				}
			} else {
				throw "Invalid arguments to select2 plugin: " + args;
			}
		});
		return (value === undefined) ? this : value;
	};

	// plugin defaults, accessible to users
	$.fn.select2.defaults = {
		width: "copy",
		loadMorePadding: 0,
		closeOnSelect: true,
		openOnEnter: true,
		containerCss: {},
		dropdownCss: {},
		containerCssClass: "",
		dropdownCssClass: "",
		formatResult: function (result, container, query, escapeMarkup) {
			var markup = [];
			markMatch(result.text, query.term, markup, escapeMarkup);
			return markup.join("");
		},
		formatSelection: function (data, container, escapeMarkup) {
			return data ? escapeMarkup(data.text) : undefined;
		},
		sortResults: function (results, container, query) {
			return results;
		},
		formatResultCssClass: function (data) {
			return undefined;
		},
		formatSelectionCssClass: function (data, container) {
			return undefined;
		},
		formatNoMatches: function () {
			return "No matches found";
		},
		formatInputTooShort: function (input, min) {
			var n = min - input.length;
			return "Please enter " + n + " more character" + (n == 1 ? "" : "s");
		},
		formatInputTooLong: function (input, max) {
			var n = input.length - max;
			return "Please delete " + n + " character" + (n == 1 ? "" : "s");
		},
		formatSelectionTooBig: function (limit) {
			return "You can only select " + limit + " item" + (limit == 1 ? "" : "s");
		},
		formatLoadMore: function (pageNumber) {
			return "Loading more results...";
		},
		formatSearching: function () {
			return "Searching...";
		},
		minimumResultsForSearch: 0,
		minimumInputLength: 0,
		maximumInputLength: null,
		maximumSelectionSize: 0,
		id: function (e) {
			return e.id;
		},
		matcher: function (term, text) {
			return stripDiacritics('' + text).toUpperCase().indexOf(stripDiacritics('' + term).toUpperCase()) >= 0;
		},
		separator: ",",
		tokenSeparators: [],
		tokenizer: defaultTokenizer,
		escapeMarkup: defaultEscapeMarkup,
		blurOnChange: false,
		selectOnBlur: false,
		adaptContainerCssClass: function (c) {
			return c;
		},
		adaptDropdownCssClass: function (c) {
			return null;
		},
		nextSearchTerm: function (selectedObject, currentSearchTerm) {
			return undefined;
		}
	};

	$.fn.select2.ajaxDefaults = {
		transport: $.ajax,
		params: {
			type: "GET",
			cache: false,
			dataType: "json"
		}
	};

	// exports
	window.Select2 = {
		query: {
			ajax: ajax,
			local: local,
			tags: tags
		}, util: {
			debounce: debounce,
			markMatch: markMatch,
			escapeMarkup: defaultEscapeMarkup,
			stripDiacritics: stripDiacritics
		}, "class": {
			"abstract": AbstractSelect2,
			"single": SingleSelect2,
			"multi": MultiSelect2
		}
	};

}(jQuery));
