/*

Copyright 2012 Igor Vaynberg

Version: @@ver@@ Timestamp: @@timestamp@@

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"){

$.fn.extend({

/*

* 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, $document;

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;

}

};

$document = $(document);

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

function indexOf(value, array) {

var i = 0, l = array.length, v;

if (typeof value === "undefined") {

return -1;

}

if (value.constructor === String) {

for (; i < l; i = i + 1) if (value.localeCompare(array[i]) === 0) return i;

} else {

for (; i < l; i = i + 1) {

v = array[i];

if (v.constructor === String) {

if (v.localeCompare(value) === 0) return i;

} else {

if (v === value) return i;

}

}

}

return -1;

}

/**

* Compares equality of a and b taking into account that a and b may be strings, in which case localeCompare is used

* @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;

if (a.constructor === String) return a.localeCompare(b) === 0;

if (b.constructor === String) return b.localeCompare(a) === 0;

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.bind("keydown", function () {

if ($.data(element, key) === undefined) {

$.data(element, key, element.val());

}

});

element.bind("keyup", function () {

var val= $.data(element, key);

if (val !== undefined && element.val() !== val) {

$.removeData(element, key);

element.trigger("keyup-change");

}

});

}

$document.bind("mousemove", function (e) {

lastMousePosition = {x: e.pageX, 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.bind("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.bind("scroll", function (e) {

if (indexOf(e.target, element.get()) >= 0) notify(e);

});

}

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 = $("<div></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"

});

$("body").append(sizer);

}

sizer.text(e.val());

return sizer.width();

}

function markMatch(text, term, markup, escapeMarkup) {

var match=text.toUpperCase().indexOf(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)));

}

/**

* Produces an ajax-based query function

*

* @param options object containing configuration paramters

* @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.traditional a boolean flag that should be true if you wish to use the traditional style of param serialization for the ajax request

* @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

requestSequence = 0, // sequence used to drop out-of-order responses

handler = null,

quietMillis = options.quietMillis || 100;

return function (query) {

window.clearTimeout(timeout);

timeout = window.setTimeout(function () {

requestSequence += 1; // increment the sequence

var requestNumber = requestSequence, // this request's sequence number

data = options.data, // ajax data function

transport = options.transport || $.ajax,

traditional = options.traditional || false,

type = options.type || 'GET'; // set type of request (GET or POST)

data = data.call(this, query.term, query.page, query.context);

if( null !== handler) { handler.abort(); }

handler = transport.call(null, {

url: ((typeof options.url === 'function')?options.url():options.url),

dataType: options.dataType,

data: data,

type: type,

traditional: traditional,

success: function (data) {

if (requestNumber < requestSequence) {

return;

}

// TODO 3.0 - replace query.page with query so users have access to term, page, etc.

var results = options.results(data, query.page);

query.callback(results);

}

});

}, 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,

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)) {

text = data.text;

// if text is not a function we assume it to be a key name

if (!$.isFunction(text)) {

dataText = data.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]; };

}

data = data.results;

}

return function (query) {

var t = query.term, filtered = { results: [] }, process;

if (t === "") {

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

query.callback(filtered);

};

}

// TODO javadoc

function tags(data) {

// TODO even for a function we should probably return a wrapper that does the same object/string check as

// the function for arrays. otherwise only functions that return objects are supported.

if ($.isFunction(data)) {

return data;

}

// if not a function we assume it to be an array

return function (query) {

var t = query.term, filtered = {results: []};

$(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(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.localeCompare(input) != 0) return input;

}

/**

* blurs any Select2 container that has focus when an element outside them was clicked or received focus

*

* also takes care of clicks on label tags that point to the source element

*/

$document.ready(function () {

$document.bind("mousedown touchend", function (e) {

var target = $(e.target).closest("div.select2-container").get(0), attr;

var targetDropdown = null;

if (target) {

$document.find("div.select2-container-active").each(function () {

if (this !== target) $(this).data("select2").blur();

});

targetDropdown = $(target).data('select2').dropdown.get(0);

}

// close any other active dropdowns

target = targetDropdown || $(e.target).closest("div.select2-drop").get(0);

$document.find("div.select2-drop-active").each(function () {

if (this !== target) $(this).data("select2").blur();

});

target=$(e.target);

attr = target.attr("for");

if ("LABEL" === e.target.tagName && attr && attr.length > 0) {

attr = attr.replace(/([\[\].])/g,'\\$1'); /* escapes [, ], and . so properly selects the id */

target = $("#"+attr);

target = target.data("select2");

if (target !== undefined) { target.focus(); e.preventDefault();}

}

});

});

/**

* 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) {

this.destroy();

}

this.enabled=true;

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"); });

if (opts.element.attr("class") !== undefined) {

this.container.addClass(opts.element.attr("class").replace(/validate\[[\S ]+] ?/, ''));

}

this.container.css(evaluate(opts.containerCss));

this.container.addClass(evaluate(opts.containerCssClass));

// swap container for the element

this.opts.element

.data("select2", this)

.hide()

.before(this.container);

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

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

this.dropdown.addClass(evaluate(opts.dropdownCssClass));

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

this.results = results = this.container.find(resultsSelector);

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

search.attr("tabIndex", this.opts.element.attr("tabIndex"));

this.resultsPage = 0;

this.context = null;

// initialize the container

this.initContainer();

this.initContainerWidth();

installFilteredMouseMove(this.results);

this.dropdown.delegate(resultsSelector, "mousemove-filtered", this.bind(this.highlightUnderEvent));

installDebouncedScroll(80, this.results);

this.dropdown.delegate(resultsSelector, "scroll-debounced", this.bind(this.loadMoreIfNeeded));

// 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(), height;

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.bind("keyup-change", this.bind(this.updateResults));

search.bind("focus", function () { search.addClass("select2-focused"); if (search.val() === " ") search.val(""); });

search.bind("blur", function () { search.removeClass("select2-focused");});

this.dropdown.delegate(resultsSelector, "mouseup", this.bind(function (e) {

if ($(e.target).closest(".select2-result-selectable:not(.select2-disabled)").length > 0) {

this.highlightUnderEvent(e);

this.selectHighlighted(e);

} else {

this.focusSearch();

}

killEvent(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.bind("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.element.is(":disabled") || opts.element.is("[readonly='readonly']")) this.disable();

},

// abstract

destroy: function () {

var select2 = this.opts.element.data("select2");

if (select2 !== undefined) {

select2.container.remove();

select2.dropdown.remove();

select2.opts.element

.removeData("select2")

.unbind(".select2")

.show();

}

},

// abstract

prepareOpts: function (opts) {

var element, select, idKey, ajaxUrl;

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, data, result, children, id=this.opts.id, self=this;

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=$("<div></div>");

label.addClass("select2-result-label");

formatted=opts.formatResult(result, label, query);

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 (select) {

opts.query = this.bind(function (query) {

var data = { results: [], more: false },

term = query.term,

children, firstChild, process;

process=function(element, collection) {

var group;

if (element.is("option")) {

if (query.matcher(term, element.text(), element)) {

collection.push({id:element.attr("value"), text:element.text(), element: element.get(), css: element.attr("class"), disabled: equal(element.attr("disabled"), "disabled") });

}

} else if (element.is("optgroup")) {

group={text:element.attr("label"), children:[], element: element.get(), css: element.attr("class")};

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) {

firstChild = children[0];

if ($(firstChild).text() === "") {

children=children.not(firstChild);

}

}

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(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: term, text: term}; };

}

opts.initSelection = function (element, callback) {

var data = [];

$(splitVal(element.val(), opts.separator)).each(function () {

var id = this, text = this, tags=opts.tags;

if ($.isFunction(tags)) tags=tags();

$(tags).each(function() { if (equal(this.id, id)) { text = this.text; return false; } });

data.push({id: id, text: text});

});

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 () {

this.opts.element.bind("change.select2", this.bind(function (e) {

if (this.opts.element.data("select2-change-triggered") !== true) {

this.initSelection();

}

}));

},

/**

* 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

enable: function() {

if (this.enabled) return;

this.enabled=true;

this.container.removeClass("select2-container-disabled");

this.opts.element.removeAttr("disabled");

},

// abstract

disable: function() {

if (!this.enabled) return;

this.close();

this.enabled=false;

this.container.addClass("select2-container-disabled");

this.opts.element.attr("disabled", "disabled");

},

// abstract

opened: function () {

return this.container.hasClass("select2-dropdown-open");

},

// abstract

positionDropdown: function() {

var offset = this.container.offset(),

height = this.container.outerHeight(false),

width = this.container.outerWidth(false),

dropHeight = this.dropdown.outerHeight(false),

viewPortRight = $(window).scrollLeft() + document.documentElement.clientWidth,

viewportBottom = $(window).scrollTop() + document.documentElement.clientHeight,

dropTop = offset.top + height,

dropLeft = offset.left,

enoughRoomBelow = dropTop + dropHeight <= viewportBottom,

enoughRoomAbove = (offset.top - dropHeight) >= this.body().scrollTop(),

dropWidth = this.dropdown.outerWidth(false),

enoughRoomOnRight = dropLeft + dropWidth <= viewPortRight,

aboveNow = this.dropdown.hasClass("select2-drop-above"),

bodyOffset,

above,

css;

// 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;

}

// always prefer the current above/below alignment, unless there is not enough room

if (aboveNow) {

above = true;

if (!enoughRoomAbove && enoughRoomBelow) above = false;

} else {

above = false;

if (!enoughRoomBelow && enoughRoomAbove) above = true;

}

if (!enoughRoomOnRight) {

dropLeft = offset.left + width - dropWidth;

}

if (above) {

dropTop = offset.top - dropHeight;

this.container.addClass("select2-drop-above");

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

}

else {

this.container.removeClass("select2-drop-above");

this.dropdown.removeClass("select2-drop-above");

}

css = $.extend({

top: dropTop,

left: dropLeft,

width: width

}, evaluate(this.opts.dropdownCss));

this.dropdown.css(css);

},

// abstract

shouldOpen: function() {

var event;

if (this.opened()) return false;

event = $.Event("open");

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;

window.setTimeout(this.bind(this.opening), 1);

return true;

},

/**

* Performs the opening of the dropdown

*/

// abstract

opening: function() {

var cid = this.containerId, selector = this.containerSelector,

scroll = "scroll." + cid, resize = "resize." + cid;

this.container.parents().each(function() {