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✏️ Editing: jquery.multiselect.js

/**
 * Display a nice easy to use multiselect list
 * @Version: 2.4.15
 * @Author: Patrick Springstubbe
 * @Contact: @JediNobleclem
 * @Website: springstubbe.us
 * @Source: https://github.com/nobleclem/jQuery-MultiSelect
 *
 * Usage:
 *     $('select[multiple]').multiselect();
 *     $('select[multiple]').multiselect({ texts: { placeholder: 'Select options' } });
 *     $('select[multiple]').multiselect('reload');
 *     $('select[multiple]').multiselect( 'loadOptions', [{
 *         name   : 'Option Name 1',
 *         value  : 'option-value-1',
 *         checked: false,
 *         attributes : {
 *             custom1: 'value1',
 *             custom2: 'value2'
 *         }
 *     },{
 *         name   : 'Option Name 2',
 *         value  : 'option-value-2',
 *         checked: false,
 *         attributes : {
 *             custom1: 'value1',
 *             custom2: 'value2'
 *         }
 *     }]);
 *
 **/
(function($){
    var defaults = {
        columns: 1,     // how many columns should be use to show options
        search : false, // include option search box

// search filter options
        searchOptions : {
            delay        : 250,                  // time (in ms) between keystrokes until search happens
            showOptGroups: false,                // show option group titles if no options remaining
            searchText   : true,                 // search within the text
            searchValue  : false,                // search within the value
            onSearch     : function( element ){} // fires on keyup before search on options happens
        },

// plugin texts
        texts: {
            placeholder    : 'Select options', // text to use in dummy input
            search         : 'Search',         // search input placeholder text
            selectedOptions: ' selected',      // selected suffix text
            selectAll      : 'Select all',     // select all text
            unselectAll    : 'Unselect all',   // unselect all text
            noneSelected   : 'None Selected'   // None selected text
        },

// general options
        selectAll          : false, // add select all option
        selectGroup        : false, // select entire optgroup
        minHeight          : 200,   // minimum height of option overlay
        maxHeight          : null,  // maximum height of option overlay
        maxWidth           : null,  // maximum width of option overlay (or selector)
        maxPlaceholderWidth: null,  // maximum width of placeholder button
        maxPlaceholderOpts : 10,    // maximum number of placeholder options to show until "# selected" shown instead
        showCheckbox       : true,  // display the checkbox to the user
        checkboxAutoFit    : false,  // auto calc checkbox padding
        optionAttributes   : [],    // attributes to copy to the checkbox from the option element

// Callbacks
        onLoad        : function( element ){},           // fires at end of list initialization
        onOptionClick : function( element, option ){},   // fires when an option is clicked
        onControlClose: function( element ){},           // fires when the options list is closed
        onSelectAll   : function( element, selected ){}, // fires when (un)select all is clicked
    };

var msCounter    = 1; // counter for each select list
    var msOptCounter = 1; // counter for each option on page

// FOR LEGACY BROWSERS (talking to you IE8)
    if( typeof Array.prototype.map !== 'function' ) {
        Array.prototype.map = function( callback, thisArg ) {
            if( typeof thisArg === 'undefined' ) {
                thisArg = this;
            }

return $.isArray( thisArg ) ? $.map( thisArg, callback ) : [];
        };
    }
    if( typeof String.prototype.trim !== 'function' ) {
        String.prototype.trim = function() {
            return this.replace(/^\s+|\s+$/g, '');
        };
    }

function MultiSelect( element, options )
    {
        this.element           = element;
        this.options           = $.extend( true, {}, defaults, options );
        this.updateSelectAll   = true;
        this.updatePlaceholder = true;
        this.listNumber        = msCounter;

msCounter = msCounter + 1; // increment counter

/* Make sure its a multiselect list */
        if( !$(this.element).attr('multiple') ) {
            throw new Error( '[jQuery-MultiSelect] Select list must be a multiselect list in order to use this plugin' );
        }

/* Options validation checks */
        if( this.options.search ){
            if( !this.options.searchOptions.searchText && !this.options.searchOptions.searchValue ){
                throw new Error( '[jQuery-MultiSelect] Either searchText or searchValue should be true.' );
            }
        }

/** BACKWARDS COMPATIBILITY **/
        if( 'placeholder' in this.options ) {
            this.options.texts.placeholder = this.options.placeholder;
            delete this.options.placeholder;
        }
        if( 'default' in this.options.searchOptions ) {
            this.options.texts.search = this.options.searchOptions['default'];
            delete this.options.searchOptions['default'];
        }
        /** END BACKWARDS COMPATIBILITY **/

// load this instance
        this.load();
    }

MultiSelect.prototype = {
        /* LOAD CUSTOM MULTISELECT DOM/ACTIONS */
        load: function() {
            var instance = this;

// make sure this is a select list and not loaded
            if( (instance.element.nodeName != 'SELECT') || $(instance.element).hasClass('jqmsLoaded') ) {
                return true;
            }

// sanity check so we don't double load on a select element
            $(instance.element).addClass('jqmsLoaded ms-list-'+ instance.listNumber ).data( 'plugin_multiselect-instance', instance );

// add option container
            $(instance.element).after('<div id="ms-list-'+ instance.listNumber +'" class="ms-options-wrap"><button type="button"><span>None Selected</span></button><div class="ms-options"><ul></ul></div></div>');

var placeholder = $(instance.element).siblings('#ms-list-'+ instance.listNumber +'.ms-options-wrap').find('> button:first-child');
            var optionsWrap = $(instance.element).siblings('#ms-list-'+ instance.listNumber +'.ms-options-wrap').find('> .ms-options');
            var optionsList = optionsWrap.find('> ul');

// don't show checkbox (add class for css to hide checkboxes)
            if( !instance.options.showCheckbox ) {
                optionsWrap.addClass('hide-checkbox');
            }
            else if( instance.options.checkboxAutoFit ) {
                optionsWrap.addClass('checkbox-autofit');
            }

// check if list is disabled
            if( $(instance.element).prop( 'disabled' ) ) {
                placeholder.prop( 'disabled', true );
            }

// set placeholder maxWidth
            if( instance.options.maxPlaceholderWidth ) {
                placeholder.css( 'maxWidth', instance.options.maxPlaceholderWidth );
            }

// override with user defined maxHeight
            if( instance.options.maxHeight ) {
                var maxHeight = instance.options.maxHeight;
            }
            else {
                // cacl default maxHeight
                var maxHeight = ($(window).height() - optionsWrap.offset().top + $(window).scrollTop() - 20);
            }

// maxHeight cannot be less than options.minHeight
            maxHeight = maxHeight < instance.options.minHeight ? instance.options.minHeight : maxHeight;

optionsWrap.css({
                maxWidth : instance.options.maxWidth,
                minHeight: instance.options.minHeight,
                maxHeight: maxHeight,
            });

// isolate options scroll
            // @source: https://github.com/nobleclem/jQuery-IsolatedScroll
            optionsWrap.on( 'touchmove mousewheel DOMMouseScroll', function ( e ) {
                if( ($(this).outerHeight() < $(this)[0].scrollHeight) ) {
                    var e0 = e.originalEvent,
                        delta = e0.wheelDelta || -e0.detail;

if( ($(this).outerHeight() + $(this)[0].scrollTop) > $(this)[0].scrollHeight ) {
                        e.preventDefault();
                        this.scrollTop += ( delta < 0 ? 1 : -1 );
                    }
                }
            });

// hide options menus if click happens off of the list placeholder button
            $(document).off('click.ms-hideopts').on('click.ms-hideopts', function( event ){
                if( !$(event.target).closest('.ms-options-wrap').length ) {
                    $('.ms-options-wrap.ms-active > .ms-options').each(function(){
                        $(this).closest('.ms-options-wrap').removeClass('ms-active');

var listID = $(this).closest('.ms-options-wrap').attr('id');

var thisInst = $(this).parent().siblings('.'+ listID +'.jqmsLoaded').data('plugin_multiselect-instance');

// USER CALLBACK
                        if( typeof thisInst.options.onControlClose == 'function' ) {
                            thisInst.options.onControlClose( thisInst.element );
                        }
                    });
                }
            // hide open option lists if escape key pressed
            }).on('keydown', function( event ){
                if( (event.keyCode || event.which) == 27 ) { // esc key
                    $(this).trigger('click.ms-hideopts');
                }
            });

// handle pressing enter|space while tabbing through
            placeholder.on('keydown', function( event ){
                var code = (event.keyCode || event.which);
                if( (code == 13) || (code == 32) ) { // enter OR space
                    placeholder.trigger( 'mousedown' );
                }
            });

// disable button action
            placeholder.on( 'mousedown', function( event ){
                // ignore if its not a left click
                if( event.which && (event.which != 1) ) {
                    return true;
                }

// hide other menus before showing this one
                $('.ms-options-wrap.ms-active').each(function(){
                    if( $(this).siblings( '.'+ $(this).attr('id') +'.jqmsLoaded')[0] != optionsWrap.parent().siblings('.ms-list-'+ instance.listNumber +'.jqmsLoaded')[0] ) {
                        $(this).removeClass('ms-active');

var thisInst = $(this).siblings( '.'+ $(this).attr('id') +'.jqmsLoaded').data('plugin_multiselect-instance');

// USER CALLBACK
                        if( typeof thisInst.options.onControlClose == 'function' ) {
                            thisInst.options.onControlClose( thisInst.element );
                        }
                    }
                });

// show/hide options
                optionsWrap.closest('.ms-options-wrap').toggleClass('ms-active');

// recalculate height
                if( optionsWrap.closest('.ms-options-wrap').hasClass('ms-active') ) {
                    optionsWrap.css( 'maxHeight', '' );

// override with user defined maxHeight
                    if( instance.options.maxHeight ) {
                        var maxHeight = instance.options.maxHeight;
                    }
                    else {
                        // cacl default maxHeight
                        var maxHeight = ($(window).height() - optionsWrap.offset().top + $(window).scrollTop() - 20);
                    }

if( maxHeight ) {
                        // maxHeight cannot be less than options.minHeight
                        maxHeight = maxHeight < instance.options.minHeight ? instance.options.minHeight : maxHeight;

optionsWrap.css( 'maxHeight', maxHeight );
                    }
                }
                else if( typeof instance.options.onControlClose == 'function' ) {
                    instance.options.onControlClose( instance.element );
                }
            }).click(function( event ){ event.preventDefault(); });

// add placeholder copy
            if( instance.options.texts.placeholder ) {
                placeholder.find('span').text( instance.options.texts.placeholder );
            }

// add search box
            if( instance.options.search ) {
                optionsList.before('<div class="ms-search"><input type="text" value="" placeholder="'+ instance.options.texts.search +'" /></div>');

var search = optionsWrap.find('.ms-search input');
                search.on('keyup', function(){
                    // ignore keystrokes that don't make a difference
                    if( $(this).data('lastsearch') == $(this).val() ) {
                        return true;
                    }

// pause timeout
                    if( $(this).data('searchTimeout') ) {
                        clearTimeout( $(this).data('searchTimeout') );
                    }

var thisSearchElem = $(this);

$(this).data('searchTimeout', setTimeout(function(){
                        thisSearchElem.data('lastsearch', thisSearchElem.val() );

// USER CALLBACK
                        if( typeof instance.options.searchOptions.onSearch == 'function' ) {
                            instance.options.searchOptions.onSearch( instance.element );
                        }

// search non optgroup li's
                        var searchString = $.trim( search.val().toLowerCase() );
                        if( searchString ) {
                            optionsList.find('li[data-search-term*="'+ searchString +'"]:not(.optgroup)').removeClass('ms-hidden');
                            optionsList.find('li:not([data-search-term*="'+ searchString +'"], .optgroup)').addClass('ms-hidden');
                        }
                        else {
                            optionsList.find('.ms-hidden').removeClass('ms-hidden');
                        }

// show/hide optgroups based on if there are items visible within
                        if( !instance.options.searchOptions.showOptGroups ) {
                            optionsList.find('.optgroup').each(function(){
                                if( $(this).find('li:not(.ms-hidden)').length ) {
                                    $(this).show();
                                }
                                else {
                                    $(this).hide();
                                }
                            });
                        }

instance._updateSelectAllText();
                    }, instance.options.searchOptions.delay ));
                });
            }

// add global select all options
            if( instance.options.selectAll ) {
                optionsList.before('<a href="#" class="ms-selectall global">' + instance.options.texts.selectAll + '</a>');
            }

// handle select all option
            optionsWrap.on('click', '.ms-selectall', function( event ){
                event.preventDefault();

instance.updateSelectAll   = false;
                instance.updatePlaceholder = false;

var select = optionsWrap.parent().siblings('.ms-list-'+ instance.listNumber +'.jqmsLoaded');

if( $(this).hasClass('global') ) {
                    // check if any options are not selected if so then select them
                    if( optionsList.find('li:not(.optgroup, .selected, .ms-hidden)').length ) {
                        // get unselected vals, mark as selected, return val list
                        optionsList.find('li:not(.optgroup, .selected, .ms-hidden)').addClass('selected');
                        optionsList.find('li.selected input[type="checkbox"]:not(:disabled)').prop( 'checked', true );
                    }
                    // deselect everything
                    else {
                        optionsList.find('li:not(.optgroup, .ms-hidden).selected').removeClass('selected');
                        optionsList.find('li:not(.optgroup, .ms-hidden, .selected) input[type="checkbox"]:not(:disabled)').prop( 'checked', false );
                    }
                }
                else if( $(this).closest('li').hasClass('optgroup') ) {
                    var optgroup = $(this).closest('li.optgroup');

// check if any selected if so then select them
                    if( optgroup.find('li:not(.selected, .ms-hidden)').length ) {
                        optgroup.find('li:not(.selected, .ms-hidden)').addClass('selected');
                        optgroup.find('li.selected input[type="checkbox"]:not(:disabled)').prop( 'checked', true );
                    }
                    // deselect everything
                    else {
                        optgroup.find('li:not(.ms-hidden).selected').removeClass('selected');
                        optgroup.find('li:not(.ms-hidden, .selected) input[type="checkbox"]:not(:disabled)').prop( 'checked', false );
                    }
                }

var vals = [];
                optionsList.find('li.selected input[type="checkbox"]').each(function(){
                    vals.push( $(this).val() );
                });
                select.val( vals ).trigger('change');

instance.updateSelectAll   = true;
                instance.updatePlaceholder = true;

// USER CALLBACK
                if( typeof instance.options.onSelectAll == 'function' ) {
                    instance.options.onSelectAll( instance.element, vals.length );
                }

instance._updateSelectAllText();
                instance._updatePlaceholderText();
            });

// add options to wrapper
            var options = [];
            $(instance.element).children().each(function(){
                if( this.nodeName == 'OPTGROUP' ) {
                    var groupOptions = [];

$(this).children('option').each(function(){
                        var thisOptionAtts = {};
                        for( var i = 0; i < instance.options.optionAttributes.length; i++ ) {
                            var thisOptAttr = instance.options.optionAttributes[ i ];

if( $(this).attr( thisOptAttr ) !== undefined ) {
                                thisOptionAtts[ thisOptAttr ] = $(this).attr( thisOptAttr );
                            }
                        }

groupOptions.push({
                            name   : $(this).text(),
                            value  : $(this).val(),
                            checked: $(this).prop( 'selected' ),
                            attributes: thisOptionAtts
                        });
                    });

options.push({
                        label  : $(this).attr('label'),
                        options: groupOptions
                    });
                }
                else if( this.nodeName == 'OPTION' ) {
                    var thisOptionAtts = {};
                    for( var i = 0; i < instance.options.optionAttributes.length; i++ ) {
                        var thisOptAttr = instance.options.optionAttributes[ i ];

if( $(this).attr( thisOptAttr ) !== undefined ) {
                            thisOptionAtts[ thisOptAttr ] = $(this).attr( thisOptAttr );
                        }
                    }

options.push({
                        name      : $(this).text(),
                        value     : $(this).val(),
                        checked   : $(this).prop( 'selected' ),
                        attributes: thisOptionAtts
                    });
                }
                else {
                    // bad option
                    return true;
                }
            });
            instance.loadOptions( options, true, false );

// BIND SELECT ACTION
            optionsWrap.on( 'click', 'input[type="checkbox"]', function(){
                $(this).closest( 'li' ).toggleClass( 'selected' );

var select = optionsWrap.parent().siblings('.ms-list-'+ instance.listNumber +'.jqmsLoaded');

// toggle clicked option
                select.find('option[value="'+ $(this).val() +'"]').prop(
                    'selected', $(this).is(':checked')
                ).closest('select').trigger('change');

// USER CALLBACK
                if( typeof instance.options.onOptionClick == 'function' ) {
                    instance.options.onOptionClick(instance.element, this);
                }

instance._updateSelectAllText();
                instance._updatePlaceholderText();
            });

// BIND FOCUS EVENT
            optionsWrap.on('focusin', 'input[type="checkbox"]', function(){
                $(this).closest('label').addClass('focused');
            }).on('focusout', 'input[type="checkbox"]', function(){
                $(this).closest('label').removeClass('focused');
            });

// USER CALLBACK
            if( typeof instance.options.onLoad === 'function' ) {
                instance.options.onLoad( instance.element );
            }

// hide native select list
            $(instance.element).hide();
        },

/* LOAD SELECT OPTIONS */
        loadOptions: function( options, overwrite, updateSelect ) {
            overwrite    = (typeof overwrite == 'boolean') ? overwrite : true;
            updateSelect = (typeof updateSelect == 'boolean') ? updateSelect : true;

var instance    = this;
            var select      = $(instance.element);
            var optionsList = select.siblings('#ms-list-'+ instance.listNumber +'.ms-options-wrap').find('> .ms-options > ul');
            var optionsWrap = select.siblings('#ms-list-'+ instance.listNumber +'.ms-options-wrap').find('> .ms-options');

if( overwrite ) {
                optionsList.find('> li').remove();

if( updateSelect ) {
                    select.find('> *').remove();
                }
            }

var containers = [];
            for( var key in options ) {
                // Prevent prototype methods injected into options from being iterated over.
                if( !options.hasOwnProperty( key ) ) {
                    continue;
                }

var thisOption      = options[ key ];
                var container       = $('<li/>');
                var appendContainer = true;

// OPTION
                if( thisOption.hasOwnProperty('value') ) {
                    if( instance.options.showCheckbox && instance.options.checkboxAutoFit ) {
                        container.addClass('ms-reflow');
                    }

// add option to ms dropdown
                    instance._addOption( container, thisOption );

if( updateSelect ) {
                        var selOption = $('<option value="'+ thisOption.value +'">'+ thisOption.name +'</option>');

// add custom user attributes
                        if( thisOption.hasOwnProperty('attributes') && Object.keys( thisOption.attributes ).length ) {
                            selOption.attr( thisOption.attributes );
                        }

// mark option as selected
                        if( thisOption.checked ) {
                            selOption.prop( 'selected', true );
                        }

select.append( selOption );
                    }
                }
                // OPTGROUP
                else if( thisOption.hasOwnProperty('options') ) {
                    var optGroup = $('<optgroup label="'+ thisOption.label +'"></optgroup>');

optionsList.find('> li.optgroup > span.label').each(function(){
                        if( $(this).text() == thisOption.label ) {
                            container       = $(this).closest('.optgroup');
                            appendContainer = false;
                        }
                    });

// prepare to append optgroup to select element
                    if( updateSelect ) {
                        if( select.find('optgroup[label="'+ thisOption.label +'"]').length ) {
                            optGroup = select.find('optgroup[label="'+ thisOption.label +'"]');
                        }
                        else {
                            select.append( optGroup );
                        }
                    }

// setup container
                    if( appendContainer ) {
                        container.addClass('optgroup');
                        container.append('<span class="label">'+ thisOption.label +'</span>');
                        container.find('> .label').css({
                            clear: 'both'
                        });

// add select all link
                        if( instance.options.selectGroup ) {
                            container.append('<a href="#" class="ms-selectall">' + instance.options.texts.selectAll + '</a>');
                        }

container.append('<ul/>');
                    }

for( var gKey in thisOption.options ) {
                        // Prevent prototype methods injected into options from
                        // being iterated over.
                        if( !thisOption.options.hasOwnProperty( gKey ) ) {
                            continue;
                        }

var thisGOption = thisOption.options[ gKey ];
                        var gContainer  = $('<li/>');
                        if( instance.options.showCheckbox && instance.options.checkboxAutoFit ) {
                            gContainer.addClass('ms-reflow');
                        }

// no clue what this is we hit (skip)
                        if( !thisGOption.hasOwnProperty('value') ) {
                            continue;
                        }

instance._addOption( gContainer, thisGOption );

container.find('> ul').append( gContainer );

// add option to optgroup in select element
                        if( updateSelect ) {
                            var selOption = $('<option value="'+ thisGOption.value +'">'+ thisGOption.name +'</option>');

// add custom user attributes
                            if( thisGOption.hasOwnProperty('attributes') && Object.keys( thisGOption.attributes ).length ) {
                                selOption.attr( thisGOption.attributes );
                            }

// mark option as selected
                            if( thisGOption.checked ) {
                                selOption.prop( 'selected', true );
                            }

optGroup.append( selOption );
                        }
                    }
                }
                else {
                    // no clue what this is we hit (skip)
                    continue;
                }

if( appendContainer ) {
                    containers.push( container );
                }
            }
            optionsList.append( containers );

// pad out label for room for the checkbox
            if( instance.options.checkboxAutoFit && instance.options.showCheckbox && !optionsWrap.hasClass('hide-checkbox') ) {
                var chkbx = optionsList.find('.ms-reflow:eq(0) input[type="checkbox"]');
                if( chkbx.length ) {
                    var checkboxWidth = chkbx.outerWidth();
                        checkboxWidth = checkboxWidth ? checkboxWidth : 15;

optionsList.find('.ms-reflow label').css(
                        'padding-left',
                        (parseInt( chkbx.closest('label').css('padding-left') ) * 2) + checkboxWidth
                    );

optionsList.find('.ms-reflow').removeClass('ms-reflow');
                }
            }

// update placeholder text
            instance._updatePlaceholderText();

// RESET COLUMN STYLES
            optionsWrap.find('ul').css({
                'column-count'        : '',
                'column-gap'          : '',
                '-webkit-column-count': '',
                '-webkit-column-gap'  : '',
                '-moz-column-count'   : '',
                '-moz-column-gap'     : ''
            });

// COLUMNIZE
            if( select.find('optgroup').length ) {
                // float non grouped options
                optionsList.find('> li:not(.optgroup)').css({
                    'float': 'left',
                    width: (100 / instance.options.columns) +'%'
                });

// add CSS3 column styles
                optionsList.find('li.optgroup').css({
                    clear: 'both'
                }).find('> ul').css({
                    'column-count'        : instance.options.columns,
                    'column-gap'          : 0,
                    '-webkit-column-count': instance.options.columns,
                    '-webkit-column-gap'  : 0,
                    '-moz-column-count'   : instance.options.columns,
                    '-moz-column-gap'     : 0
                });

// for crappy IE versions float grouped options
                if( this._ieVersion() && (this._ieVersion() < 10) ) {
                    optionsList.find('li.optgroup > ul > li').css({
                        'float': 'left',
                        width: (100 / instance.options.columns) +'%'
                    });
                }
            }
            else {
                // add CSS3 column styles
                optionsList.css({
                    'column-count'        : instance.options.columns,
                    'column-gap'          : 0,
                    '-webkit-column-count': instance.options.columns,
                    '-webkit-column-gap'  : 0,
                    '-moz-column-count'   : instance.options.columns,
                    '-moz-column-gap'     : 0
                });

// for crappy IE versions float grouped options
                if( this._ieVersion() && (this._ieVersion() < 10) ) {
                    optionsList.find('> li').css({
                        'float': 'left',
                        width: (100 / instance.options.columns) +'%'
                    });
                }
            }

// update un/select all logic
            instance._updateSelectAllText();
        },

/* UPDATE MULTISELECT CONFIG OPTIONS */
        settings: function( options ) {
            this.options = $.extend( true, {}, this.options, options );
            this.reload();
        },

/* RESET THE DOM */
        unload: function() {
            $(this.element).siblings('#ms-list-'+ this.listNumber +'.ms-options-wrap').remove();
            $(this.element).show(function(){
                $(this).css('display','').removeClass('jqmsLoaded');
            });
        },

/* RELOAD JQ MULTISELECT LIST */
        reload: function() {
            // remove existing options
            $(this.element).siblings('#ms-list-'+ this.listNumber +'.ms-options-wrap').remove();
            $(this.element).removeClass('jqmsLoaded');

// load element
            this.load();
        },

// RESET BACK TO DEFAULT VALUES & RELOAD
        reset: function() {
            var defaultVals = [];
            $(this.element).find('option').each(function(){
                if( $(this).prop('defaultSelected') ) {
                    defaultVals.push( $(this).val() );
                }
            });

$(this.element).val( defaultVals );

this.reload();
        },

disable: function( status ) {
            status = (typeof status === 'boolean') ? status : true;
            $(this.element).prop( 'disabled', status );
            $(this.element).siblings('#ms-list-'+ this.listNumber +'.ms-options-wrap').find('button:first-child')
                .prop( 'disabled', status );
        },

/** PRIVATE FUNCTIONS **/
        // update the un/select all texts based on selected options and visibility
        _updateSelectAllText: function(){
            if( !this.updateSelectAll ) {
                return;
            }

var instance = this;

// select all not used at all so just do nothing
            if( !instance.options.selectAll && !instance.options.selectGroup ) {
                return;
            }

var optionsWrap = $(instance.element).siblings('#ms-list-'+ instance.listNumber +'.ms-options-wrap').find('> .ms-options');

// update un/select all text
            optionsWrap.find('.ms-selectall').each(function(){
                var unselected = $(this).parent().find('li:not(.optgroup,.selected,.ms-hidden)');

$(this).text(
                    unselected.length ? instance.options.texts.selectAll : instance.options.texts.unselectAll
                );
            });
        },

// update selected placeholder text
        _updatePlaceholderText: function(){
            if( !this.updatePlaceholder ) {
                return;
            }

var instance       = this;
            var select         = $(instance.element);
            var selectVals     = select.val() ? select.val() : [];
            var placeholder    = select.siblings('#ms-list-'+ instance.listNumber +'.ms-options-wrap').find('> button:first-child');
            var placeholderTxt = placeholder.find('span');
            var optionsWrap    = select.siblings('#ms-list-'+ instance.listNumber +'.ms-options-wrap').find('> .ms-options');

// if there are disabled options get those values as well
            if( select.find('option:selected:disabled').length ) {
                selectVals = [];
                select.find('option:selected').each(function(){
                    selectVals.push( $(this).val() );
                });
            }

// get selected options
            var selOpts = [];
            for( var key in selectVals ) {
                // Prevent prototype methods injected into options from being iterated over.
                if( !selectVals.hasOwnProperty( key ) ) {
                    continue;
                }

selOpts.push(
                    $.trim( select.find('option[value="'+ selectVals[ key ] +'"]').text() )
                );

if( selOpts.length >= instance.options.maxPlaceholderOpts ) {
                    break;
                }
            }

// UPDATE PLACEHOLDER TEXT WITH OPTIONS SELECTED
            placeholderTxt.text( selOpts.join( ', ' ) );

if( selOpts.length ) {
                optionsWrap.closest('.ms-options-wrap').addClass('ms-has-selections');
            }
            else {
                optionsWrap.closest('.ms-options-wrap').removeClass('ms-has-selections');
            }

// replace placeholder text
            if( !selOpts.length ) {
                placeholderTxt.text( instance.options.texts.placeholder );
            }
            // if copy is larger than button width use "# selected"
            else if( (placeholderTxt.width() > placeholder.width()) || (selOpts.length != selectVals.length) ) {
                placeholderTxt.text( selectVals.length + instance.options.texts.selectedOptions );
            }
        },

// Add option to the custom dom list
        _addOption: function( container, option ) {
            var instance = this;
            var thisOption = $('<label/>', {
                for : 'ms-opt-'+ msOptCounter,
                text: option.name
            });

var thisCheckbox = $('<input>', {
                type : 'checkbox',
                title: option.name,
                id   : 'ms-opt-'+ msOptCounter,
                value: option.value
            });

// add user defined attributes
            if( option.hasOwnProperty('attributes') && Object.keys( option.attributes ).length ) {
                thisCheckbox.attr( option.attributes );
            }

if( option.checked ) {
                container.addClass('default selected');
                thisCheckbox.prop( 'checked', true );
            }

thisOption.prepend( thisCheckbox );

var searchTerm = '';
            if( instance.options.searchOptions.searchText ) {
                searchTerm += ' ' + option.name.toLowerCase();
            }
            if( instance.options.searchOptions.searchValue ) {
                searchTerm += ' ' + option.value.toLowerCase();
            }

container.attr( 'data-search-term', $.trim( searchTerm ) ).prepend( thisOption );

msOptCounter = msOptCounter + 1;
        },

// check ie version
        _ieVersion: function() {
            var myNav = navigator.userAgent.toLowerCase();
            return (myNav.indexOf('msie') != -1) ? parseInt(myNav.split('msie')[1]) : false;
        }
    };

// ENABLE JQUERY PLUGIN FUNCTION
    $.fn.multiselect = function( options ){
        if( !this.length ) {
            return;
        }

var args = arguments;
        var ret;

// menuize each list
        if( (options === undefined) || (typeof options === 'object') ) {
            return this.each(function(){
                if( !$.data( this, 'plugin_multiselect' ) ) {
                    $.data( this, 'plugin_multiselect', new MultiSelect( this, options ) );
                }
            });
        } else if( (typeof options === 'string') && (options[0] !== '_') && (options !== 'init') ) {
            this.each(function(){
                var instance = $.data( this, 'plugin_multiselect' );

if( instance instanceof MultiSelect && typeof instance[ options ] === 'function' ) {
                    ret = instance[ options ].apply( instance, Array.prototype.slice.call( args, 1 ) );
                }

// special destruct handler
                if( options === 'unload' ) {
                    $.data( this, 'plugin_multiselect', null );
                }
            });

return ret;
        }
    };
}(jQuery));

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