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$.widget('ui.tagit', {
        options: {
            allowDuplicates   : false,
            caseSensitive     : true,
            fieldName         : 'tags',
            placeholderText   : null,   // Sets `placeholder` attr on input field.
            readOnly          : false,  // Disables editing.
            removeConfirmation: false,  // Require confirmation to remove tags.
            tagLimit          : null,   // Max number of tags allowed (null for unlimited).

// Used for autocomplete, unless you override `autocomplete.source`.
            availableTags     : [],

// Use to override or add any options to the autocomplete widget.
            //
            // By default, autocomplete.source will map to availableTags,
            // unless overridden.
            autocomplete: {},

// Shows autocomplete before the user even types anything.
            showAutocompleteOnFocus: false,

// When enabled, quotes are unneccesary for inputting multi-word tags.
            allowSpaces: false,

// The below options are for using a single field instead of several
            // for our form values.
            //
            // When enabled, will use a single hidden field for the form,
            // rather than one per tag. It will delimit tags in the field
            // with singleFieldDelimiter.
            //
            // The easiest way to use singleField is to just instantiate tag-it
            // on an INPUT element, in which case singleField is automatically
            // set to true, and singleFieldNode is set to that element. This
            // way, you don't need to fiddle with these options.
            singleField: false,

// This is just used when preloading data from the field, and for
            // populating the field with delimited tags as the user adds them.
            singleFieldDelimiter: ',',

// Set this to an input DOM node to use an existing form field.
            // Any text in it will be erased on init. But it will be
            // populated with the text of tags as they are created,
            // delimited by singleFieldDelimiter.
            //
            // If this is not set, we create an input node for it,
            // with the name given in settings.fieldName.
            singleFieldNode: null,

// Whether to animate tag removals or not.
            animate: true,

// Optionally set a tabindex attribute on the input that gets
            // created for tag-it.
            tabIndex: null,

// Event callbacks.
            beforeTagAdded      : null,
            afterTagAdded       : null,

beforeTagRemoved    : null,
            afterTagRemoved     : null,

onTagClicked        : null,
            onTagLimitExceeded  : null,

// DEPRECATED:
            //
            // /!\ These event callbacks are deprecated and WILL BE REMOVED at some
            // point in the future. They're here for backwards-compatibility.
            // Use the above before/after event callbacks instead.
            onTagAdded  : null,
            onTagRemoved: null,
            // `autocomplete.source` is the replacement for tagSource.
            tagSource: null
            // Do not use the above deprecated options.
        },

_create: function() {
            // for handling static scoping inside callbacks
            var that = this;

// There are 2 kinds of DOM nodes this widget can be instantiated on:
            //     1. UL, OL, or some element containing either of these.
            //     2. INPUT, in which case 'singleField' is overridden to true,
            //        a UL is created and the INPUT is hidden.
            if (this.element.is('input')) {
                this.tagList = $('<ul></ul>').insertAfter(this.element);
                this.options.singleField = true;
                this.options.singleFieldNode = this.element;
                this.element.addClass('tagit-hidden-field');
            } else {
                this.tagList = this.element.find('ul, ol').andSelf().last();
            }

this.tagInput = $('<input type="text" />').addClass('ui-widget-content');

if (this.options.readOnly) this.tagInput.attr('disabled', 'disabled');

if (this.options.tabIndex) {
                this.tagInput.attr('tabindex', this.options.tabIndex);
            }

if (this.options.placeholderText) {
                this.tagInput.attr('placeholder', this.options.placeholderText);
            }

if (!this.options.autocomplete.source) {
                this.options.autocomplete.source = function(search, showChoices) {
                    var filter = search.term.toLowerCase();
                    var choices = $.grep(this.options.availableTags, function(element) {
                        // Only match autocomplete options that begin with the search term.
                        // (Case insensitive.)
                        return (element.toLowerCase().indexOf(filter) === 0);
                    });
                    if (!this.options.allowDuplicates) {
                        choices = this._subtractArray(choices, this.assignedTags());
                    }
                    showChoices(choices);
                };
            }

if (this.options.showAutocompleteOnFocus) {
                this.tagInput.focus(function(event, ui) {
                    that._showAutocomplete();
                });

if (typeof this.options.autocomplete.minLength === 'undefined') {
                    this.options.autocomplete.minLength = 0;
                }
            }

// Bind autocomplete.source callback functions to this context.
            if ($.isFunction(this.options.autocomplete.source)) {
                this.options.autocomplete.source = $.proxy(this.options.autocomplete.source, this);
            }

// DEPRECATED.
            if ($.isFunction(this.options.tagSource)) {
                this.options.tagSource = $.proxy(this.options.tagSource, this);
            }

this.tagList
                .addClass('tagit')
                .addClass('ui-widget ui-widget-content ui-corner-all')
                // Create the input field.
                .append($('<li class="tagit-new"></li>').append(this.tagInput))
                .click(function(e) {
                    var target = $(e.target);
                    if (target.hasClass('tagit-label')) {
                        var tag = target.closest('.tagit-choice');
                        if (!tag.hasClass('removed')) {
                            that._trigger('onTagClicked', e, {tag: tag, tagLabel: that.tagLabel(tag)});
                        }
                    } else {
                        // Sets the focus() to the input field, if the user
                        // clicks anywhere inside the UL. This is needed
                        // because the input field needs to be of a small size.
                        that.tagInput.focus();
                    }
                });

// Single field support.
            var addedExistingFromSingleFieldNode = false;
            if (this.options.singleField) {
                if (this.options.singleFieldNode) {
                    // Add existing tags from the input field.
                    var node = $(this.options.singleFieldNode);
                    var tags = node.val().split(this.options.singleFieldDelimiter);
                    node.val('');
                    $.each(tags, function(index, tag) {
                        that.createTag(tag, null, true);
                        addedExistingFromSingleFieldNode = true;
                    });
                } else {
                    // Create our single field input after our list.
                    this.options.singleFieldNode = $('<input type="hidden" style="display:none;" value="" name="' + this.options.fieldName + '" />');
                    this.tagList.after(this.options.singleFieldNode);
                }
            }

// Add existing tags from the list, if any.
            if (!addedExistingFromSingleFieldNode) {
                this.tagList.children('li').each(function() {
                    if (!$(this).hasClass('tagit-new')) {
                        that.createTag($(this).text(), $(this).attr('class'), true);
                        $(this).remove();
                    }
                });
            }

// Events.
            this.tagInput
                .keydown(function(event) {
                    // Backspace is not detected within a keypress, so it must use keydown.
                    if (event.which == $.ui.keyCode.BACKSPACE && that.tagInput.val() === '') {
                        var tag = that._lastTag();
                        if (!that.options.removeConfirmation || tag.hasClass('remove')) {
                            // When backspace is pressed, the last tag is deleted.
                            that.removeTag(tag);
                        } else if (that.options.removeConfirmation) {
                            tag.addClass('remove ui-state-highlight');
                        }
                    } else if (that.options.removeConfirmation) {
                        that._lastTag().removeClass('remove ui-state-highlight');
                    }

// Comma/Space/Enter are all valid delimiters for new tags,
                    // except when there is an open quote or if setting allowSpaces = true.
                    // Tab will also create a tag, unless the tag input is empty,
                    // in which case it isn't caught.
                    if (
                        (event.which === $.ui.keyCode.COMMA && event.shiftKey === false) ||
                        event.which === $.ui.keyCode.ENTER ||
                        (
                            event.which == $.ui.keyCode.TAB &&
                            that.tagInput.val() !== ''
                        ) ||
                        (
                            event.which == $.ui.keyCode.SPACE &&
                            that.options.allowSpaces !== true &&
                            (
                                $.trim(that.tagInput.val()).replace( /^s*/, '' ).charAt(0) != '"' ||
                                (
                                    $.trim(that.tagInput.val()).charAt(0) == '"' &&
                                    $.trim(that.tagInput.val()).charAt($.trim(that.tagInput.val()).length - 1) == '"' &&
                                    $.trim(that.tagInput.val()).length - 1 !== 0
                                )
                            )
                        )
                    ) {
                        // Enter submits the form if there's no text in the input.
                        if (!(event.which === $.ui.keyCode.ENTER && that.tagInput.val() === '')) {
                            event.preventDefault();
                        }

// Autocomplete will create its own tag from a selection and close automatically.
                        if (!(that.options.autocomplete.autoFocus && that.tagInput.data('autocomplete-open'))) {
                            that.tagInput.autocomplete('close');
                            that.createTag(that._cleanedInput());
                        }
                    }
                }).blur(function(e){
                    // Create a tag when the element loses focus.
                    // If autocomplete is enabled and suggestion was clicked, don't add it.
                    if (!that.tagInput.data('autocomplete-open')) {
                        that.createTag(that._cleanedInput());
                    }
                });

// Autocomplete.
            if (this.options.availableTags || this.options.tagSource || this.options.autocomplete.source) {
                var autocompleteOptions = {
                    select: function(event, ui) {
                        that.createTag(ui.item.value);
                        // Preventing the tag input to be updated with the chosen value.
                        return false;
                    }
                };
                $.extend(autocompleteOptions, this.options.autocomplete);

// tagSource is deprecated, but takes precedence here since autocomplete.source is set by default,
                // while tagSource is left null by default.
                autocompleteOptions.source = this.options.tagSource || autocompleteOptions.source;

this.tagInput.autocomplete(autocompleteOptions).bind('autocompleteopen.tagit', function(event, ui) {
                    that.tagInput.data('autocomplete-open', true);
                }).bind('autocompleteclose.tagit', function(event, ui) {
                    that.tagInput.data('autocomplete-open', false);
                });

this.tagInput.autocomplete('widget').addClass('tagit-autocomplete');
            }
        },

destroy: function() {
            $.Widget.prototype.destroy.call(this);

this.element.unbind('.tagit');
            this.tagList.unbind('.tagit');

this.tagInput.removeData('autocomplete-open');

this.tagList.removeClass([
                'tagit',
                'ui-widget',
                'ui-widget-content',
                'ui-corner-all',
                'tagit-hidden-field'
            ].join(' '));

if (this.element.is('input')) {
                this.element.removeClass('tagit-hidden-field');
                this.tagList.remove();
            } else {
                this.element.children('li').each(function() {
                    if ($(this).hasClass('tagit-new')) {
                        $(this).remove();
                    } else {
                        $(this).removeClass([
                            'tagit-choice',
                            'ui-widget-content',
                            'ui-state-default',
                            'ui-state-highlight',
                            'ui-corner-all',
                            'remove',
                            'tagit-choice-editable',
                            'tagit-choice-read-only'
                        ].join(' '));

$(this).text($(this).children('.tagit-label').text());
                    }
                });

if (this.singleFieldNode) {
                    this.singleFieldNode.remove();
                }
            }

return this;
        },

_cleanedInput: function() {
            // Returns the contents of the tag input, cleaned and ready to be passed to createTag
            return $.trim(this.tagInput.val().replace(/^"(.*)"$/, '$1'));
        },

_lastTag: function() {
            return this.tagList.find('.tagit-choice:last:not(.removed)');
        },

_tags: function() {
            return this.tagList.find('.tagit-choice:not(.removed)');
        },

assignedTags: function() {
            // Returns an array of tag string values
            var that = this;
            var tags = [];
            if (this.options.singleField) {
                tags = $(this.options.singleFieldNode).val().split(this.options.singleFieldDelimiter);
                if (tags[0] === '') {
                    tags = [];
                }
            } else {
                this._tags().each(function() {
                    tags.push(that.tagLabel(this));
                });
            }
            return tags;
        },

_updateSingleTagsField: function(tags) {
            // Takes a list of tag string values, updates this.options.singleFieldNode.val to the tags delimited by this.options.singleFieldDelimiter
            $(this.options.singleFieldNode).val(tags.join(this.options.singleFieldDelimiter)).trigger('change');
        },

_subtractArray: function(a1, a2) {
            var result = [];
            for (var i = 0; i < a1.length; i++) {
                if ($.inArray(a1[i], a2) == -1) {
                    result.push(a1[i]);
                }
            }
            return result;
        },

tagLabel: function(tag) {
            // Returns the tag's string label.
            if (this.options.singleField) {
                return $(tag).find('.tagit-label:first').text();
            } else {
                return $(tag).find('input:first').val();
            }
        },

_showAutocomplete: function() {
            this.tagInput.autocomplete('search', '');
        },

_findTagByLabel: function(name) {
            var that = this;
            var tag = null;
            this._tags().each(function(i) {
                if (that._formatStr(name) == that._formatStr(that.tagLabel(this))) {
                    tag = $(this);
                    return false;
                }
            });
            return tag;
        },

_isNew: function(name) {
            return !this._findTagByLabel(name);
        },

_formatStr: function(str) {
            if (this.options.caseSensitive) {
                return str;
            }
            return $.trim(str.toLowerCase());
        },

_effectExists: function(name) {
            return Boolean($.effects && ($.effects[name] || ($.effects.effect && $.effects.effect[name])));
        },

createTag: function(value, additionalClass, duringInitialization) {
            var that = this;

value = $.trim(value);

if(this.options.preprocessTag) {
                value = this.options.preprocessTag(value);
            }

if (value === '') {
                return false;
            }

if (!this.options.allowDuplicates && !this._isNew(value)) {
                var existingTag = this._findTagByLabel(value);
                if (this._trigger('onTagExists', null, {
                    existingTag: existingTag,
                    duringInitialization: duringInitialization
                }) !== false) {
                    if (this._effectExists('highlight')) {
                        existingTag.effect('highlight');
                    }
                }
                return false;
            }

if (this.options.tagLimit && this._tags().length >= this.options.tagLimit) {
                this._trigger('onTagLimitExceeded', null, {duringInitialization: duringInitialization});
                return false;
            }

var label = $(this.options.onTagClicked ? '<a class="tagit-label"></a>' : '<span class="tagit-label"></span>').text(value);

// Create tag.
            var tag = $('<li></li>')
                .addClass('tagit-choice ui-widget-content ui-state-default ui-corner-all')
                .addClass(additionalClass)
                .append(label);

if (this.options.readOnly){
                tag.addClass('tagit-choice-read-only');
            } else {
                tag.addClass('tagit-choice-editable');
                // Button for removing the tag.
                var removeTagIcon = $('<span></span>')
                    .addClass('ui-icon ui-icon-close');
                var removeTag = $('<a><span class="text-icon">\xd7</span></a>') // \xd7 is an X
                    .addClass('tagit-close')
                    .append(removeTagIcon)
                    .click(function(e) {
                        // Removes a tag when the little 'x' is clicked.
                        that.removeTag(tag);
                    });
                tag.append(removeTag);
            }

// Unless options.singleField is set, each tag has a hidden input field inline.
            if (!this.options.singleField) {
                var escapedValue = label.html();
                tag.append('<input type="hidden" value="' + escapedValue + '" name="' + this.options.fieldName + '" class="tagit-hidden-field" />');
            }

if (this._trigger('beforeTagAdded', null, {
                tag: tag,
                tagLabel: this.tagLabel(tag),
                duringInitialization: duringInitialization
            }) === false) {
                return;
            }

if (this.options.singleField) {
                var tags = this.assignedTags();
                tags.push(value);
                this._updateSingleTagsField(tags);
            }

// DEPRECATED.
            this._trigger('onTagAdded', null, tag);

this.tagInput.val('');

// Insert tag.
            this.tagInput.parent().before(tag);

this._trigger('afterTagAdded', null, {
                tag: tag,
                tagLabel: this.tagLabel(tag),
                duringInitialization: duringInitialization
            });

if (this.options.showAutocompleteOnFocus && !duringInitialization) {
                setTimeout(function () { that._showAutocomplete(); }, 0);
            }
        },

removeTag: function(tag, animate) {
            animate = typeof animate === 'undefined' ? this.options.animate : animate;

tag = $(tag);

// DEPRECATED.
            this._trigger('onTagRemoved', null, tag);

if (this._trigger('beforeTagRemoved', null, {tag: tag, tagLabel: this.tagLabel(tag)}) === false) {
                return;
            }

if (this.options.singleField) {
                var tags = this.assignedTags();
                var removedTagLabel = this.tagLabel(tag);
                tags = $.grep(tags, function(el){
                    return el != removedTagLabel;
                });
                this._updateSingleTagsField(tags);
            }

if (animate) {
                tag.addClass('removed'); // Excludes this tag from _tags.
                var hide_args = this._effectExists('blind') ? ['blind', {direction: 'horizontal'}, 'fast'] : ['fast'];

var thisTag = this;
                hide_args.push(function() {
                    tag.remove();
                    thisTag._trigger('afterTagRemoved', null, {tag: tag, tagLabel: thisTag.tagLabel(tag)});
                });

tag.fadeOut('fast').hide.apply(tag, hide_args).dequeue();
            } else {
                tag.remove();
                this._trigger('afterTagRemoved', null, {tag: tag, tagLabel: this.tagLabel(tag)});
            }

removeTagByLabel: function(tagLabel, animate) {
            var toRemove = this._findTagByLabel(tagLabel);
            if (!toRemove) {
                throw "No such tag exists with the name '" + tagLabel + "'";
            }
            this.removeTag(toRemove, animate);
        },

removeAll: function() {
            // Removes all tags.
            var that = this;
            this._tags().each(function(index, tag) {
                that.removeTag(tag, false);
            });
        }

});
})(jQuery);

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