add bootstrap multiselect.

2 files changed, 1264 insertions, 0 deletions

diff --git a/vendor/assets/javascripts/bootstrap-multiselect.js b/vendor/assets/javascripts/bootstrap-multiselect.js
new file mode 100644
index 00000000..ea6d1bf0
--- /dev/null
+++ b/vendor/assets/javascripts/bootstrap-multiselect.js
@@ -0,0 +1,1263 @@
+/**
+ * Bootstrap Multiselect v0.9.8 (https://github.com/davidstutz/bootstrap-multiselect)
+ * 
+ * Copyright 2012 - 2014 David Stutz
+ * 
+ * Dual licensed under the BSD-3-Clause and the Apache License, Version 2.0.
+ */
+!function($) {
+ 
+    "use strict";// jshint ;_;
+
+    if (typeof ko !== 'undefined' && ko.bindingHandlers && !ko.bindingHandlers.multiselect) {
+        ko.bindingHandlers.multiselect = {
+
+            init: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
+
+                var listOfSelectedItems = allBindingsAccessor().selectedOptions;
+                var config = ko.utils.unwrapObservable(valueAccessor());
+
+                $(element).multiselect(config);
+
+                if (isObservableArray(listOfSelectedItems)) {
+                    
+                    // Set the initial selection state on the multiselect list.
+                    $(element).multiselect('select', ko.utils.unwrapObservable(listOfSelectedItems));
+                    
+                    // Subscribe to the selectedOptions: ko.observableArray
+                    listOfSelectedItems.subscribe(function (changes) {
+                        var addedArray = [], deletedArray = [];
+                        forEach(changes, function (change) {
+                            switch (change.status) {
+                                case 'added':
+                                    addedArray.push(change.value);
+                                    break;
+                                case 'deleted':
+                                    deletedArray.push(change.value);
+                                    break;
+                            }
+                        });
+                        
+                        if (addedArray.length > 0) {
+                            $(element).multiselect('select', addedArray);
+                        }
+                        
+                        if (deletedArray.length > 0) {
+                            $(element).multiselect('deselect', deletedArray);
+                        }
+                    }, null, "arrayChange");
+                }
+            },
+
+            update: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
+
+                var listOfItems = allBindingsAccessor().options,
+                    ms = $(element).data('multiselect'),
+                    config = ko.utils.unwrapObservable(valueAccessor());
+
+                if (isObservableArray(listOfItems)) {
+                    // Subscribe to the options: ko.observableArray incase it changes later
+                    listOfItems.subscribe(function (theArray) {
+                        $(element).multiselect('rebuild');
+                    });
+                }
+
+                if (!ms) {
+                    $(element).multiselect(config);
+                }
+                else {
+                    ms.updateOriginalOptions();
+                }
+            }
+        };
+    }
+
+    function isObservableArray(obj) {
+        return ko.isObservable(obj) && !(obj.destroyAll === undefined);
+    }
+
+    function forEach(array, callback) {
+        for (var index = 0; index < array.length; ++index) {
+            callback(array[index]);
+        }
+    }
+
+    /**
+     * Constructor to create a new multiselect using the given select.
+     * 
+     * @param {jQuery} select
+     * @param {Object} options
+     * @returns {Multiselect}
+     */
+    function Multiselect(select, options) {
+
+        this.$select = $(select);
+        this.options = this.mergeOptions($.extend({}, options, this.$select.data()));
+
+        // Initialization.
+        // We have to clone to create a new reference.
+        this.originalOptions = this.$select.clone()[0].options;
+        this.query = '';
+        this.searchTimeout = null;
+
+        this.options.multiple = this.$select.attr('multiple') === "multiple";
+        this.options.onChange = $.proxy(this.options.onChange, this);
+        this.options.onDropdownShow = $.proxy(this.options.onDropdownShow, this);
+        this.options.onDropdownHide = $.proxy(this.options.onDropdownHide, this);
+        this.options.onDropdownShown = $.proxy(this.options.onDropdownShown, this);
+        this.options.onDropdownHidden = $.proxy(this.options.onDropdownHidden, this);
+        
+        // Build select all if enabled.
+        this.buildContainer();
+        this.buildButton();
+        this.buildDropdown();
+        this.buildSelectAll();
+        this.buildDropdownOptions();
+        this.buildFilter();
+        
+        this.updateButtonText();
+        this.updateSelectAll();
+        
+        if (this.options.disableIfEmpty && $('option', this.$select).length <= 0) {
+            this.disable();
+        }
+        
+        this.$select.hide().after(this.$container);
+    };
+
+    Multiselect.prototype = {
+
+        defaults: {
+            /**
+             * Default text function will either print 'None selected' in case no
+             * option is selected or a list of the selected options up to a length
+             * of 3 selected options.
+             * 
+             * @param {jQuery} options
+             * @param {jQuery} select
+             * @returns {String}
+             */
+            buttonText: function(options, select) {
+                if (options.length === 0) {
+                    return this.nonSelectedText + ' <b class="caret"></b>';
+                }
+                else if (options.length == $('option', $(select)).length) {
+                    return this.allSelectedText + ' <b class="caret"></b>';
+                }
+                else if (options.length > this.numberDisplayed) {
+                    return options.length + ' ' + this.nSelectedText + ' <b class="caret"></b>';
+                }
+                else {
+                    var selected = '';
+                    options.each(function() {
+                        var label = ($(this).attr('label') !== undefined) ? $(this).attr('label') : $(this).html();
+
+                        selected += label + ', ';
+                    });
+                    
+                    return selected.substr(0, selected.length - 2) + ' <b class="caret"></b>';
+                }
+            },
+            /**
+             * Updates the title of the button similar to the buttonText function.
+             * 
+             * @param {jQuery} options
+             * @param {jQuery} select
+             * @returns {@exp;selected@call;substr}
+             */
+            buttonTitle: function(options, select) {
+                if (options.length === 0) {
+                    return this.nonSelectedText;
+                }
+                else {
+                    var selected = '';
+                    options.each(function () {
+                        selected += $(this).text() + ', ';
+                    });
+                    return selected.substr(0, selected.length - 2);
+                }
+            },
+            /**
+             * Create a label.
+             * 
+             * @param {jQuery} element
+             * @returns {String}
+             */
+            label: function(element){
+                return $(element).attr('label') || $(element).html();
+            },
+            /**
+             * Triggered on change of the multiselect.
+             * 
+             * Not triggered when selecting/deselecting options manually.
+             * 
+             * @param {jQuery} option
+             * @param {Boolean} checked
+             */
+            onChange : function(option, checked) {
+
+            },
+            /**
+             * Triggered when the dropdown is shown.
+             * 
+             * @param {jQuery} event
+             */
+            onDropdownShow: function(event) {
+                
+            },
+            /**
+             * Triggered when the dropdown is hidden.
+             * 
+             * @param {jQuery} event
+             */
+            onDropdownHide: function(event) {
+                
+            },
+            /**
+             * Triggered after the dropdown is shown.
+             * 
+             * @param {jQuery} event
+             */
+            onDropdownShown: function(event) {
+                
+            },
+            /**
+             * Triggered after the dropdown is hidden.
+             * 
+             * @param {jQuery} event
+             */
+            onDropdownHidden: function(event) {
+                
+            },
+            buttonClass: 'btn btn-default',
+            buttonWidth: 'auto',
+            buttonContainer: '<div class="btn-group" />',
+            dropRight: false,
+            selectedClass: 'active',
+            // Maximum height of the dropdown menu.
+            // If maximum height is exceeded a scrollbar will be displayed.
+            maxHeight: false,
+            checkboxName: false,
+            includeSelectAllOption: false,
+            includeSelectAllIfMoreThan: 0,
+            selectAllText: ' Select all',
+            selectAllValue: 'multiselect-all',
+            selectAllName: false,
+            enableFiltering: false,
+            enableCaseInsensitiveFiltering: false,
+            enableClickableOptGroups: false,
+            filterPlaceholder: 'Search',
+            // possible options: 'text', 'value', 'both'
+            filterBehavior: 'text',
+            includeFilterClearBtn: true,
+            preventInputChangeEvent: false,
+            nonSelectedText: 'None selected',
+            nSelectedText: 'selected',
+            allSelectedText: 'All selected',
+            numberDisplayed: 3,
+            disableIfEmpty: false,
+            templates: {
+                button: '<button type="button" class="multiselect dropdown-toggle" data-toggle="dropdown"></button>',
+                ul: '<ul class="multiselect-container dropdown-menu"></ul>',
+                filter: '<li class="multiselect-item filter"><div class="input-group"><span class="input-group-addon"><i class="glyphicon glyphicon-search"></i></span><input class="form-control multiselect-search" type="text"></div></li>',
+                filterClearBtn: '<span class="input-group-btn"><button class="btn btn-default multiselect-clear-filter" type="button"><i class="glyphicon glyphicon-remove-circle"></i></button></span>',
+                li: '<li><a href="javascript:void(0);"><label></label></a></li>',
+                divider: '<li class="multiselect-item divider"></li>',
+                liGroup: '<li class="multiselect-item multiselect-group"><label></label></li>'
+            }
+        },
+
+        constructor: Multiselect,
+
+        /**
+         * Builds the container of the multiselect.
+         */
+        buildContainer: function() {
+            this.$container = $(this.options.buttonContainer);
+            this.$container.on('show.bs.dropdown', this.options.onDropdownShow);
+            this.$container.on('hide.bs.dropdown', this.options.onDropdownHide);
+            this.$container.on('shown.bs.dropdown', this.options.onDropdownShown);
+            this.$container.on('hidden.bs.dropdown', this.options.onDropdownHidden);
+        },
+
+        /**
+         * Builds the button of the multiselect.
+         */
+        buildButton: function() {
+            this.$button = $(this.options.templates.button).addClass(this.options.buttonClass);
+
+            // Adopt active state.
+            if (this.$select.prop('disabled')) {
+                this.disable();
+            }
+            else {
+                this.enable();
+            }
+
+            // Manually add button width if set.
+            if (this.options.buttonWidth && this.options.buttonWidth !== 'auto') {
+                this.$button.css({
+                    'width' : this.options.buttonWidth
+                });
+                this.$container.css({
+                    'width': this.options.buttonWidth
+                });
+            }
+
+            // Keep the tab index from the select.
+            var tabindex = this.$select.attr('tabindex');
+            if (tabindex) {
+                this.$button.attr('tabindex', tabindex);
+            }
+
+            this.$container.prepend(this.$button);
+        },
+
+        /**
+         * Builds the ul representing the dropdown menu.
+         */
+        buildDropdown: function() {
+
+            // Build ul.
+            this.$ul = $(this.options.templates.ul);
+
+            if (this.options.dropRight) {
+                this.$ul.addClass('pull-right');
+            }
+
+            // Set max height of dropdown menu to activate auto scrollbar.
+            if (this.options.maxHeight) {
+                // TODO: Add a class for this option to move the css declarations.
+                this.$ul.css({
+                    'max-height': this.options.maxHeight + 'px',
+                    'overflow-y': 'auto',
+                    'overflow-x': 'hidden'
+                });
+            }
+
+            this.$container.append(this.$ul);
+        },
+
+        /**
+         * Build the dropdown options and binds all nessecary events.
+         * 
+         * Uses createDivider and createOptionValue to create the necessary options.
+         */
+        buildDropdownOptions: function() {
+
+            this.$select.children().each($.proxy(function(index, element) {
+
+                var $element = $(element);
+                // Support optgroups and options without a group simultaneously.
+                var tag = $element.prop('tagName')
+                    .toLowerCase();
+            
+                if ($element.prop('value') === this.options.selectAllValue) {
+                    return;
+                }
+
+                if (tag === 'optgroup') {
+                    this.createOptgroup(element);
+                }
+                else if (tag === 'option') {
+
+                    if ($element.data('role') === 'divider') {
+                        this.createDivider();
+                    }
+                    else {
+                        this.createOptionValue(element);
+                    }
+
+                }
+                
+                // Other illegal tags will be ignored.
+            }, this));
+
+            // Bind the change event on the dropdown elements.
+            $('li input', this.$ul).on('change', $.proxy(function(event) {
+                var $target = $(event.target);
+
+                var checked = $target.prop('checked') || false;
+                var isSelectAllOption = $target.val() === this.options.selectAllValue;
+
+                // Apply or unapply the configured selected class.
+                if (this.options.selectedClass) {
+                    if (checked) {
+                        $target.closest('li')
+                            .addClass(this.options.selectedClass);
+                    }
+                    else {
+                        $target.closest('li')
+                            .removeClass(this.options.selectedClass);
+                    }
+                }
+
+                // Get the corresponding option.
+                var value = $target.val();
+                var $option = this.getOptionByValue(value);
+
+                var $optionsNotThis = $('option', this.$select).not($option);
+                var $checkboxesNotThis = $('input', this.$container).not($target);
+
+                if (isSelectAllOption) {
+                    if (checked) {
+                        this.selectAll();
+                    }
+                    else {
+                        this.deselectAll();
+                    }
+                }
+
+                if(!isSelectAllOption){
+                    if (checked) {
+                        $option.prop('selected', true);
+
+                        if (this.options.multiple) {
+                            // Simply select additional option.
+                            $option.prop('selected', true);
+                        }
+                        else {
+                            // Unselect all other options and corresponding checkboxes.
+                            if (this.options.selectedClass) {
+                                $($checkboxesNotThis).closest('li').removeClass(this.options.selectedClass);
+                            }
+
+                            $($checkboxesNotThis).prop('checked', false);
+                            $optionsNotThis.prop('selected', false);
+
+                            // It's a single selection, so close.
+                            this.$button.click();
+                        }
+
+                        if (this.options.selectedClass === "active") {
+                            $optionsNotThis.closest("a").css("outline", "");
+                        }
+                    }
+                    else {
+                        // Unselect option.
+                        $option.prop('selected', false);
+                    }
+                }
+
+                this.$select.change();
+
+                this.updateButtonText();
+                this.updateSelectAll();
+                
+                this.options.onChange($option, checked);
+
+                if(this.options.preventInputChangeEvent) {
+                    return false;
+                }
+            }, this));
+
+            $('li a', this.$ul).on('touchstart click', function(event) {
+                event.stopPropagation();
+
+                var $target = $(event.target);
+
+                if (event.shiftKey) {
+                    var checked = $target.prop('checked') || false;
+
+                    if (checked) {
+                        var prev = $target.closest('li')
+                            .siblings('li[class="active"]:first');
+
+                        var currentIdx = $target.closest('li')
+                            .index();
+                        var prevIdx = prev.index();
+
+                        if (currentIdx > prevIdx) {
+                            $target.closest("li").prevUntil(prev).each(
+                                function() {
+                                    $(this).find("input:first").prop("checked", true)
+                                        .trigger("change");
+                                }
+                            );
+                        }
+                        else {
+                            $target.closest("li").nextUntil(prev).each(
+                                function() {
+                                    $(this).find("input:first").prop("checked", true)
+                                        .trigger("change");
+                                }
+                            );
+                        }
+                    }
+                }
+
+                $target.blur();
+            });
+
+            // Keyboard support.
+            this.$container.off('keydown.multiselect').on('keydown.multiselect', $.proxy(function(event) {
+                if ($('input[type="text"]', this.$container).is(':focus')) {
+                    return;
+                }
+
+                if (event.keyCode === 9 && this.$container.hasClass('open')) {
+                    this.$button.click();
+                }
+                else {
+                    var $items = $(this.$container).find("li:not(.divider):not(.disabled) a").filter(":visible");
+
+                    if (!$items.length) {
+                        return;
+                    }
+
+                    var index = $items.index($items.filter(':focus'));
+
+                    // Navigation up.
+                    if (event.keyCode === 38 && index > 0) {
+                        index--;
+                    }
+                    // Navigate down.
+                    else if (event.keyCode === 40 && index < $items.length - 1) {
+                        index++;
+                    }
+                    else if (!~index) {
+                        index = 0;
+                    }
+
+                    var $current = $items.eq(index);
+                    $current.focus();
+
+                    if (event.keyCode === 32 || event.keyCode === 13) {
+                        var $checkbox = $current.find('input');
+
+                        $checkbox.prop("checked", !$checkbox.prop("checked"));
+                        $checkbox.change();
+                    }
+
+                    event.stopPropagation();
+                    event.preventDefault();
+                }
+            }, this));
+
+            if(this.options.enableClickableOptGroups && this.options.multiple) {
+                $('li.multiselect-group', this.$ul).on('click', $.proxy(function(event) {
+                    event.stopPropagation();
+
+                    var group = $(event.target).parent();
+
+                    // Search all option in optgroup
+                    var $options = group.nextUntil('li.multiselect-group');
+
+                    // check or uncheck items
+                    var allChecked = true;
+                    var optionInputs = $options.find('input');
+                    optionInputs.each(function() {
+                        allChecked = allChecked && $(this).prop('checked');
+                    });
+
+                    optionInputs.prop('checked', !allChecked).trigger('change');
+               }, this));
+            }
+        },
+
+        /**
+         * Create an option using the given select option.
+         * 
+         * @param {jQuery} element
+         */
+        createOptionValue: function(element) {
+            var $element = $(element);
+            if ($element.is(':selected')) {
+                $element.prop('selected', true);
+            }
+
+            // Support the label attribute on options.
+            var label = this.options.label(element);
+            var value = $element.val();
+            var inputType = this.options.multiple ? "checkbox" : "radio";
+
+            var $li = $(this.options.templates.li);
+            var $label = $('label', $li);
+            $label.addClass(inputType);
+
+            var $checkbox = $('<input/>').attr('type', inputType);
+
+            if (this.options.checkboxName) {
+                $checkbox.attr('name', this.options.checkboxName);
+            }
+            $label.append($checkbox);
+
+            var selected = $element.prop('selected') || false;
+            $checkbox.val(value);
+
+            if (value === this.options.selectAllValue) {
+                $li.addClass("multiselect-item multiselect-all");
+                $checkbox.parent().parent()
+                    .addClass('multiselect-all');
+            }
+
+            $label.append(" " + label);
+            $label.attr('title', $element.attr('title'));
+
+            this.$ul.append($li);
+
+            if ($element.is(':disabled')) {
+                $checkbox.attr('disabled', 'disabled')
+                    .prop('disabled', true)
+                    .closest('a')
+                    .attr("tabindex", "-1")
+                    .closest('li')
+                    .addClass('disabled');
+            }
+
+            $checkbox.prop('checked', selected);
+
+            if (selected && this.options.selectedClass) {
+                $checkbox.closest('li')
+                    .addClass(this.options.selectedClass);
+            }
+        },
+
+        /**
+         * Creates a divider using the given select option.
+         * 
+         * @param {jQuery} element
+         */
+        createDivider: function(element) {
+            var $divider = $(this.options.templates.divider);
+            this.$ul.append($divider);
+        },
+
+        /**
+         * Creates an optgroup.
+         * 
+         * @param {jQuery} group
+         */
+        createOptgroup: function(group) {
+            var groupName = $(group).prop('label');
+
+            // Add a header for the group.
+            var $li = $(this.options.templates.liGroup);
+            $('label', $li).text(groupName);
+
+            if (this.options.enableClickableOptGroups) {
+                $li.addClass('multiselect-group-clickable');
+            }
+
+            this.$ul.append($li);
+
+            if ($(group).is(':disabled')) {
+                $li.addClass('disabled');
+            }
+
+            // Add the options of the group.
+            $('option', group).each($.proxy(function(index, element) {
+                this.createOptionValue(element);
+            }, this));
+        },
+
+        /**
+         * Build the selct all.
+         * 
+         * Checks if a select all has already been created.
+         */
+        buildSelectAll: function() {
+            if (typeof this.options.selectAllValue === 'number') {
+                this.options.selectAllValue = this.options.selectAllValue.toString();
+            }
+            
+            var alreadyHasSelectAll = this.hasSelectAll();
+            
+            if (!alreadyHasSelectAll && this.options.includeSelectAllOption && this.options.multiple
+                    && $('option', this.$select).length > this.options.includeSelectAllIfMoreThan) {
+                
+                // Check whether to add a divider after the select all.
+                if (this.options.includeSelectAllDivider) {
+                    this.$ul.prepend($(this.options.templates.divider));
+                }
+
+                var $li = $(this.options.templates.li);
+                $('label', $li).addClass("checkbox");
+                
+                if (this.options.selectAllName) {
+                    $('label', $li).append('<input type="checkbox" name="' + this.options.selectAllName + '" />');
+                }
+                else {
+                    $('label', $li).append('<input type="checkbox" />');
+                }
+                
+                var $checkbox = $('input', $li);
+                $checkbox.val(this.options.selectAllValue);
+
+                $li.addClass("multiselect-item multiselect-all");
+                $checkbox.parent().parent()
+                    .addClass('multiselect-all');
+
+                $('label', $li).append(" " + this.options.selectAllText);
+
+                this.$ul.prepend($li);
+
+                $checkbox.prop('checked', false);
+            }
+        },
+
+        /**
+         * Builds the filter.
+         */
+        buildFilter: function() {
+
+            // Build filter if filtering OR case insensitive filtering is enabled and the number of options exceeds (or equals) enableFilterLength.
+            if (this.options.enableFiltering || this.options.enableCaseInsensitiveFiltering) {
+                var enableFilterLength = Math.max(this.options.enableFiltering, this.options.enableCaseInsensitiveFiltering);
+
+                if (this.$select.find('option').length >= enableFilterLength) {
+
+                    this.$filter = $(this.options.templates.filter);
+                    $('input', this.$filter).attr('placeholder', this.options.filterPlaceholder);
+                    
+                    // Adds optional filter clear button
+                    if(this.options.includeFilterClearBtn){
+                        var clearBtn = $(this.options.templates.filterClearBtn);
+                        clearBtn.on('click', $.proxy(function(event){
+                            clearTimeout(this.searchTimeout);
+                            this.$filter.find('.multiselect-search').val('');
+                            $('li', this.$ul).show().removeClass("filter-hidden");
+                            this.updateSelectAll();
+                        }, this));
+                        this.$filter.find('.input-group').append(clearBtn);
+                    }
+                    
+                    this.$ul.prepend(this.$filter);
+
+                    this.$filter.val(this.query).on('click', function(event) {
+                        event.stopPropagation();
+                    }).on('input keydown', $.proxy(function(event) {
+                        // Cancel enter key default behaviour
+                        if (event.which === 13) {
+                          event.preventDefault();
+                        }
+                        
+                        // This is useful to catch "keydown" events after the browser has updated the control.
+                        clearTimeout(this.searchTimeout);
+
+                        this.searchTimeout = this.asyncFunction($.proxy(function() {
+
+                            if (this.query !== event.target.value) {
+                                this.query = event.target.value;
+
+                                var currentGroup, currentGroupVisible;
+                                $.each($('li', this.$ul), $.proxy(function(index, element) {
+                                    var value = $('input', element).val();
+                                    var text = $('label', element).text();
+
+                                    var filterCandidate = '';
+                                    if ((this.options.filterBehavior === 'text')) {
+                                        filterCandidate = text;
+                                    }
+                                    else if ((this.options.filterBehavior === 'value')) {
+                                        filterCandidate = value;
+                                    }
+                                    else if (this.options.filterBehavior === 'both') {
+                                        filterCandidate = text + '\n' + value;
+                                    }
+
+                                    if (value !== this.options.selectAllValue && text) {
+                                        // By default lets assume that element is not
+                                        // interesting for this search.
+                                        var showElement = false;
+
+                                        if (this.options.enableCaseInsensitiveFiltering && filterCandidate.toLowerCase().indexOf(this.query.toLowerCase()) > -1) {
+                                            showElement = true;
+                                        }
+                                        else if (filterCandidate.indexOf(this.query) > -1) {
+                                            showElement = true;
+                                        }
+
+                                        // Toggle current element (group or group item) according to showElement boolean
+                                        $(element).toggle(showElement).toggleClass('filter-hidden', !showElement);
+                                        // Differentiate groups and group items
+                                        if ($(this).hasClass('multiselect-group')) {
+                                            // Remember group status
+                                            currentGroup = element;
+                                            currentGroupVisible = showElement;
+                                        } else {
+                                            // show group name when at least one of its items is visible
+                                            if (showElement) $(currentGroup).show().removeClass('filter-hidden');
+                                            // show all group items when group name satisfies filter
+                                            if (!showElement && currentGroupVisible) $(element).show().removeClass('filter-hidden');
+                                        }
+                                    }
+                                }, this));
+                            }
+
+                            this.updateSelectAll();
+                        }, this), 300, this);
+                    }, this));
+                }
+            }
+        },
+
+        /**
+         * Unbinds the whole plugin.
+         */
+        destroy: function() {
+            this.$container.remove();
+            this.$select.show();
+            this.$select.data('multiselect', null);
+        },
+
+        /**
+         * Refreshs the multiselect based on the selected options of the select.
+         */
+        refresh: function() {
+            $('option', this.$select).each($.proxy(function(index, element) {
+                var $input = $('li input', this.$ul).filter(function() {
+                    return $(this).val() === $(element).val();
+                });
+
+                if ($(element).is(':selected')) {
+                    $input.prop('checked', true);
+
+                    if (this.options.selectedClass) {
+                        $input.closest('li')
+                            .addClass(this.options.selectedClass);
+                    }
+                }
+                else {
+                    $input.prop('checked', false);
+
+                    if (this.options.selectedClass) {
+                        $input.closest('li')
+                            .removeClass(this.options.selectedClass);
+                    }
+                }
+
+                if ($(element).is(":disabled")) {
+                    $input.attr('disabled', 'disabled')
+                        .prop('disabled', true)
+                        .closest('li')
+                        .addClass('disabled');
+                }
+                else {
+                    $input.prop('disabled', false)
+                        .closest('li')
+                        .removeClass('disabled');
+                }
+            }, this));
+
+            this.updateButtonText();
+            this.updateSelectAll();
+        },
+
+        /**
+         * Select all options of the given values.
+         * 
+         * If triggerOnChange is set to true, the on change event is triggered if
+         * and only if one value is passed.
+         * 
+         * @param {Array} selectValues
+         * @param {Boolean} triggerOnChange
+         */
+        select: function(selectValues, triggerOnChange) {
+            if(!$.isArray(selectValues)) {
+                selectValues = [selectValues];
+            }
+
+            for (var i = 0; i < selectValues.length; i++) {
+                var value = selectValues[i];
+
+                if (value === null || value === undefined) {
+                    continue;
+                }
+
+                var $option = this.getOptionByValue(value);
+                var $checkbox = this.getInputByValue(value);
+
+                if($option === undefined || $checkbox === undefined) {
+                    continue;
+                }
+                
+                if (!this.options.multiple) {
+                    this.deselectAll(false);
+                }
+                
+                if (this.options.selectedClass) {
+                    $checkbox.closest('li')
+                        .addClass(this.options.selectedClass);
+                }
+
+                $checkbox.prop('checked', true);
+                $option.prop('selected', true);
+            }
+
+            this.updateButtonText();
+            this.updateSelectAll();
+
+            if (triggerOnChange && selectValues.length === 1) {
+                this.options.onChange($option, true);
+            }
+        },
+
+        /**
+         * Clears all selected items.
+         */
+        clearSelection: function () {
+            this.deselectAll(false);
+            this.updateButtonText();
+            this.updateSelectAll();
+        },
+
+        /**
+         * Deselects all options of the given values.
+         * 
+         * If triggerOnChange is set to true, the on change event is triggered, if
+         * and only if one value is passed.
+         * 
+         * @param {Array} deselectValues
+         * @param {Boolean} triggerOnChange
+         */
+        deselect: function(deselectValues, triggerOnChange) {
+            if(!$.isArray(deselectValues)) {
+                deselectValues = [deselectValues];
+            }
+
+            for (var i = 0; i < deselectValues.length; i++) {
+                var value = deselectValues[i];
+
+                if (value === null || value === undefined) {
+                    continue;
+                }
+
+                var $option = this.getOptionByValue(value);
+                var $checkbox = this.getInputByValue(value);
+
+                if($option === undefined || $checkbox === undefined) {
+                    continue;
+                }
+
+                if (this.options.selectedClass) {
+                    $checkbox.closest('li')
+                        .removeClass(this.options.selectedClass);
+                }
+
+                $checkbox.prop('checked', false);
+                $option.prop('selected', false);
+            }
+
+            this.updateButtonText();
+            this.updateSelectAll();
+            
+            if (triggerOnChange && deselectValues.length === 1) {
+                this.options.onChange($option, false);
+            }
+        },
+        
+        /**
+         * Selects all enabled & visible options.
+         *
+         * If justVisible is true or not specified, only visible options are selected.
+         *
+         * @param {Boolean} justVisible
+         */
+        selectAll: function (justVisible) {
+            var justVisible = typeof justVisible === 'undefined' ? true : justVisible;
+            var allCheckboxes = $("li input[type='checkbox']:enabled", this.$ul);
+            var visibleCheckboxes = allCheckboxes.filter(":visible");
+            var allCheckboxesCount = allCheckboxes.length;
+            var visibleCheckboxesCount = visibleCheckboxes.length;
+            
+            if(justVisible) {
+                visibleCheckboxes.prop('checked', true);
+                $("li:not(.divider):not(.disabled)", this.$ul).filter(":visible").addClass(this.options.selectedClass);
+            }
+            else {
+                allCheckboxes.prop('checked', true);
+                $("li:not(.divider):not(.disabled)", this.$ul).addClass(this.options.selectedClass);
+            }
+                
+            if (allCheckboxesCount === visibleCheckboxesCount || justVisible === false) {
+                $("option:enabled", this.$select).prop('selected', true);
+            }
+            else {
+                var values = visibleCheckboxes.map(function() {
+                    return $(this).val();
+                }).get();
+                
+                $("option:enabled", this.$select).filter(function(index) {
+                    return $.inArray($(this).val(), values) !== -1;
+                }).prop('selected', true);
+            }
+        },
+
+        /**
+         * Deselects all options.
+         * 
+         * If justVisible is true or not specified, only visible options are deselected.
+         * 
+         * @param {Boolean} justVisible
+         */
+        deselectAll: function (justVisible) {
+            var justVisible = typeof justVisible === 'undefined' ? true : justVisible;
+            
+            if(justVisible) {              
+                var visibleCheckboxes = $("li input[type='checkbox']:enabled", this.$ul).filter(":visible");
+                visibleCheckboxes.prop('checked', false);
+                
+                var values = visibleCheckboxes.map(function() {
+                    return $(this).val();
+                }).get();
+                
+                $("option:enabled", this.$select).filter(function(index) {
+                    return $.inArray($(this).val(), values) !== -1;
+                }).prop('selected', false);
+                
+                if (this.options.selectedClass) {
+                    $("li:not(.divider):not(.disabled)", this.$ul).filter(":visible").removeClass(this.options.selectedClass);
+                }
+            }
+            else {
+                $("li input[type='checkbox']:enabled", this.$ul).prop('checked', false);
+                $("option:enabled", this.$select).prop('selected', false);
+                
+                if (this.options.selectedClass) {
+                    $("li:not(.divider):not(.disabled)", this.$ul).removeClass(this.options.selectedClass);
+                }
+            }
+        },
+
+        /**
+         * Rebuild the plugin.
+         * 
+         * Rebuilds the dropdown, the filter and the select all option.
+         */
+        rebuild: function() {
+            this.$ul.html('');
+
+            // Important to distinguish between radios and checkboxes.
+            this.options.multiple = this.$select.attr('multiple') === "multiple";
+
+            this.buildSelectAll();
+            this.buildDropdownOptions();
+            this.buildFilter();
+            
+            this.updateButtonText();
+            this.updateSelectAll();
+            
+            if (this.options.disableIfEmpty && $('option', this.$select).length <= 0) {
+                this.disable();
+            }
+            
+            if (this.options.dropRight) {
+                this.$ul.addClass('pull-right');
+            }
+        },
+
+        /**
+         * The provided data will be used to build the dropdown.
+         */
+        dataprovider: function(dataprovider) {
+            var optionDOM = "";
+            var groupCounter = 0;
+            var tags = $(''); // create empty jQuery array
+
+            $.each(dataprovider, function (index, option) {
+                var tag;
+                if ($.isArray(option.children)) { // create optiongroup tag
+                    groupCounter++;
+                    tag = $('<optgroup/>').attr({
+                        label: option.label || 'Group ' + groupCounter
+                    });
+                    forEach(option.children, function(subOption) { // add children option tags
+                        tag.append($('<option/>').attr({
+                            value: subOption.value,
+                            label: subOption.label || subOption.value,
+                            title: subOption.title,
+                            selected: !!subOption.selected
+                        }));
+                    });
+
+                    optionDOM += '</optgroup>';
+                }
+                else { // create option tag
+                    tag = $('<option/>').attr({
+                        value: option.value,
+                        label: option.label || option.value,
+                        title: option.title,
+                        selected: !!option.selected
+                    });
+                }
+
+                tags = tags.add(tag);
+            });
+            
+            this.$select.empty().append(tags);
+            this.rebuild();
+        },
+
+        /**
+         * Enable the multiselect.
+         */
+        enable: function() {
+            this.$select.prop('disabled', false);
+            this.$button.prop('disabled', false)
+                .removeClass('disabled');
+        },
+
+        /**
+         * Disable the multiselect.
+         */
+        disable: function() {
+            this.$select.prop('disabled', true);
+            this.$button.prop('disabled', true)
+                .addClass('disabled');
+        },
+
+        /**
+         * Set the options.
+         * 
+         * @param {Array} options
+         */
+        setOptions: function(options) {
+            this.options = this.mergeOptions(options);
+        },
+
+        /**
+         * Merges the given options with the default options.
+         * 
+         * @param {Array} options
+         * @returns {Array}
+         */
+        mergeOptions: function(options) {
+            return $.extend(true, {}, this.defaults, options);
+        },
+        
+        /**
+         * Checks whether a select all checkbox is present.
+         * 
+         * @returns {Boolean}
+         */
+        hasSelectAll: function() {
+            return $('li.' + this.options.selectAllValue, this.$ul).length > 0;
+        },
+        
+        /**
+         * Updates the select all checkbox based on the currently displayed and selected checkboxes.
+         */
+        updateSelectAll: function() {
+            if (this.hasSelectAll()) {
+                var allBoxes = $("li:not(.multiselect-item):not(.filter-hidden) input:enabled", this.$ul);
+                var allBoxesLength = allBoxes.length;
+                var checkedBoxesLength = allBoxes.filter(":checked").length;
+                var selectAllLi  = $("li." + this.options.selectAllValue, this.$ul);
+                var selectAllInput = selectAllLi.find("input");
+                
+                if (checkedBoxesLength > 0 && checkedBoxesLength === allBoxesLength) {
+                    selectAllInput.prop("checked", true);
+                    selectAllLi.addClass(this.options.selectedClass);
+                }
+                else {
+                    selectAllInput.prop("checked", false);
+                    selectAllLi.removeClass(this.options.selectedClass);
+                }
+            }
+        },
+        
+        /**
+         * Update the button text and its title based on the currently selected options.
+         */
+        updateButtonText: function() {
+            var options = this.getSelected();
+            
+            // First update the displayed button text.
+            $('.multiselect', this.$container).html(this.options.buttonText(options, this.$select));
+            
+            // Now update the title attribute of the button.
+            $('.multiselect', this.$container).attr('title', this.options.buttonTitle(options, this.$select));
+        },
+
+        /**
+         * Get all selected options.
+         * 
+         * @returns {jQUery}
+         */
+        getSelected: function() {
+            return $('option', this.$select).filter(":selected");
+        },
+
+        /**
+         * Gets a select option by its value.
+         * 
+         * @param {String} value
+         * @returns {jQuery}
+         */
+        getOptionByValue: function (value) {
+
+            var options = $('option', this.$select);
+            var valueToCompare = value.toString();
+
+            for (var i = 0; i < options.length; i = i + 1) {
+                var option = options[i];
+                if (option.value === valueToCompare) {
+                    return $(option);
+                }
+            }
+        },
+
+        /**
+         * Get the input (radio/checkbox) by its value.
+         * 
+         * @param {String} value
+         * @returns {jQuery}
+         */
+        getInputByValue: function (value) {
+
+            var checkboxes = $('li input', this.$ul);
+            var valueToCompare = value.toString();
+
+            for (var i = 0; i < checkboxes.length; i = i + 1) {
+                var checkbox = checkboxes[i];
+                if (checkbox.value === valueToCompare) {
+                    return $(checkbox);
+                }
+            }
+        },
+
+        /**
+         * Used for knockout integration.
+         */
+        updateOriginalOptions: function() {
+            this.originalOptions = this.$select.clone()[0].options;
+        },
+
+        asyncFunction: function(callback, timeout, self) {
+            var args = Array.prototype.slice.call(arguments, 3);
+            return setTimeout(function() {
+                callback.apply(self || window, args);
+            }, timeout);
+        }
+    };
+
+    $.fn.multiselect = function(option, parameter, extraOptions) {
+        return this.each(function() {
+            var data = $(this).data('multiselect');
+            var options = typeof option === 'object' && option;
+            
+            // Initialize the multiselect.
+            if (!data) {
+                data = new Multiselect(this, options);
+                $(this).data('multiselect', data);
+            }
+
+            // Call multiselect method.
+            if (typeof option === 'string') {
+                data[option](parameter, extraOptions);
+                
+                if (option === 'destroy') {
+                    $(this).data('multiselect', false);
+                }
+            }
+        });
+    };
+
+    $.fn.multiselect.Constructor = Multiselect;
+
+    $(function() {
+        $("select[data-role=multiselect]").multiselect();
+    });
+
+}(window.jQuery);
diff --git a/vendor/assets/stylesheets/bootstrap-multiselect.css b/vendor/assets/stylesheets/bootstrap-multiselect.css
new file mode 100644
index 00000000..6b69d8e1
--- /dev/null
+++ b/vendor/assets/stylesheets/bootstrap-multiselect.css
@@ -0,0 +1 @@
+.multiselect-container{position:absolute;list-style-type:none;margin:0;padding:0}.multiselect-container .input-group{margin:5px}.multiselect-container>li{padding:0}.multiselect-container>li>a.multiselect-all label{font-weight:700}.multiselect-container>li.multiselect-group label{margin:0;padding:3px 20px;height:100%;font-weight:700}.multiselect-container>li.multiselect-group-clickable label{cursor:pointer}.multiselect-container>li>a{padding:0}.multiselect-container>li>a>label{margin:0;height:100%;cursor:pointer;font-weight:400;padding:3px 20px 3px 40px}.multiselect-container>li>a>label.radio,.multiselect-container>li>a>label.checkbox{margin:0}.multiselect-container>li>a>label>input[type=checkbox]{margin-bottom:5px}.filter .btn{padding:6px 3px}.btn-group>.btn-group:nth-child(2)>.multiselect.btn{border-top-left-radius:4px;border-bottom-left-radius:4px}.form-inline .multiselect-container label.checkbox,.form-inline .multiselect-container label.radio{padding:3px 20px 3px 40px}.form-inline .multiselect-container li a label.checkbox input[type=checkbox],.form-inline .multiselect-container li a label.radio input[type=radio]{margin-left:-20px;margin-right:0}
\ No newline at end of file