diff --git a/ui-eln-lims/src/core-plugins/eln-lims/1/as/webapps/eln-lims/html/js/views/SampleTable/widgets/BatchView.js b/ui-eln-lims/src/core-plugins/eln-lims/1/as/webapps/eln-lims/html/js/views/SampleTable/widgets/BatchView.js
index db6b9f3af894d4a98ff5ce24cfa78883bda2f619..c281d4fbe9b57ee905102d564a6a8892f7a55ff2 100644
--- a/ui-eln-lims/src/core-plugins/eln-lims/1/as/webapps/eln-lims/html/js/views/SampleTable/widgets/BatchView.js
+++ b/ui-eln-lims/src/core-plugins/eln-lims/1/as/webapps/eln-lims/html/js/views/SampleTable/widgets/BatchView.js
@@ -39,7 +39,7 @@ function BatchView(controller, model) {
             $sampleTypeField.append($sampleTypeDropDownLabel);
             var $sampleTypeDropDown = $('<select>', { 'id' : 'sampleTypesSelector' , class : 'multiselect' , 'multiple' : 'multiple'});
             this._model.allowedSampleTypes.forEach(function(type) {
-                $sampleTypeDropDown.append($('<option>', { 'value' : type}).html(Util.getDisplayNameFromCode(type)));
+                $sampleTypeDropDown.append($('<option>', { 'value' : type}).text(Util.getDisplayNameFromCode(type)));
             });
             $sampleTypeField.append($sampleTypeDropDown);
             $sampleTypeDropDown.multiselect();
diff --git a/ui-eln-lims/src/core-plugins/eln-lims/1/as/webapps/eln-lims/html/lib/bootstrap-multiselect/LICENSE.txt b/ui-eln-lims/src/core-plugins/eln-lims/1/as/webapps/eln-lims/html/lib/bootstrap-multiselect/LICENSE.txt
index a57bd545da151dc031d89661052695d339327160..5e93bd513453550377338db3d76b3a8da7531b3c 100644
--- a/ui-eln-lims/src/core-plugins/eln-lims/1/as/webapps/eln-lims/html/lib/bootstrap-multiselect/LICENSE.txt
+++ b/ui-eln-lims/src/core-plugins/eln-lims/1/as/webapps/eln-lims/html/lib/bootstrap-multiselect/LICENSE.txt
@@ -1 +1,39 @@
-Dual licensed under the BSD-3-Clause and the Apache License, Version 2.0.
\ No newline at end of file
+Apache License, Version 2.0:
+
+Copyright (c) 2012 - 2018 David Stutz
+
+Licensed under the Apache License, Version 2.0 (the "License"); you may not use
+this file except in compliance with the License. You may obtain a copy of the
+License at http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software distributed
+under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+CONDITIONS OF ANY KIND, either express or implied. See the License for the
+specific language governing permissions and limitations under the License.
+
+BSD 3-Clause License:
+
+Copyright (c) 2012 - 2018 David Stutz
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+* Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+* Redistributions in binary form must reproduce the above copyright notice,
+this list of conditions and the following disclaimer in the documentation and/or
+other materials provided with the distribution.
+* Neither the name of David Stutz nor the names of its contributors may be used
+to endorse or promote products derived from this software without specific prior
+written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
\ No newline at end of file
diff --git a/ui-eln-lims/src/core-plugins/eln-lims/1/as/webapps/eln-lims/html/lib/bootstrap-multiselect/VERSION.txt b/ui-eln-lims/src/core-plugins/eln-lims/1/as/webapps/eln-lims/html/lib/bootstrap-multiselect/VERSION.txt
index 3a8d1f973a74ac00ab080fad3f6fd85767ff7c82..6f16bd3257475b6aafe62199e317333ef5535b28 100644
--- a/ui-eln-lims/src/core-plugins/eln-lims/1/as/webapps/eln-lims/html/lib/bootstrap-multiselect/VERSION.txt
+++ b/ui-eln-lims/src/core-plugins/eln-lims/1/as/webapps/eln-lims/html/lib/bootstrap-multiselect/VERSION.txt
@@ -1 +1 @@
-2014.02.15
\ No newline at end of file
+0.9.15
\ No newline at end of file
diff --git a/ui-eln-lims/src/core-plugins/eln-lims/1/as/webapps/eln-lims/html/lib/bootstrap-multiselect/css/bootstrap-multiselect.css b/ui-eln-lims/src/core-plugins/eln-lims/1/as/webapps/eln-lims/html/lib/bootstrap-multiselect/css/bootstrap-multiselect.css
index e6b8da91169da92a17026572c24c27c73080d8ff..6a6b68a249811e054fa8d759452816a9248c0748 100644
--- a/ui-eln-lims/src/core-plugins/eln-lims/1/as/webapps/eln-lims/html/lib/bootstrap-multiselect/css/bootstrap-multiselect.css
+++ b/ui-eln-lims/src/core-plugins/eln-lims/1/as/webapps/eln-lims/html/lib/bootstrap-multiselect/css/bootstrap-multiselect.css
@@ -1 +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:bold}.multiselect-container>li>label.multiselect-group{margin:0;padding:3px 20px 3px 20px;height:100%;font-weight:bold}.multiselect-container>li>a>label{margin:0;height:100%;cursor:pointer;font-weight:normal}.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}.btn-group>.btn-group:nth-child(2)>.multiselect.btn{border-top-left-radius:4px;border-bottom-left-radius:4px}
\ No newline at end of file
+span.multiselect-native-select{position:relative}span.multiselect-native-select select{border:0!important;clip:rect(0 0 0 0)!important;height:1px!important;margin:-1px -1px -1px -3px!important;overflow:hidden!important;padding:0!important;position:absolute!important;width:1px!important;left:50%;top:30px}.multiselect-container{position:absolute;list-style-type:none;margin:0;padding:0}.multiselect-container .input-group{margin:5px}.multiselect-container .multiselect-reset .input-group{width:93%}.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.checkbox,.multiselect-container>li>a>label.radio{margin:0}.multiselect-container>li>a>label>input[type=checkbox]{margin-bottom:5px}.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
diff --git a/ui-eln-lims/src/core-plugins/eln-lims/1/as/webapps/eln-lims/html/lib/bootstrap-multiselect/js/bootstrap-multiselect.js b/ui-eln-lims/src/core-plugins/eln-lims/1/as/webapps/eln-lims/html/lib/bootstrap-multiselect/js/bootstrap-multiselect.js
index fd083953909da3d7e41b4498b22421b3b0f447b1..2a028b77886f80703f307c88847af686d489a3df 100644
--- a/ui-eln-lims/src/core-plugins/eln-lims/1/as/webapps/eln-lims/html/lib/bootstrap-multiselect/js/bootstrap-multiselect.js
+++ b/ui-eln-lims/src/core-plugins/eln-lims/1/as/webapps/eln-lims/html/lib/bootstrap-multiselect/js/bootstrap-multiselect.js
@@ -1,106 +1,292 @@
 /**
- * bootstrap-multiselect.js
- * https://github.com/davidstutz/bootstrap-multiselect
+ * Bootstrap Multiselect (http://davidstutz.de/bootstrap-multiselect/)
  *
- * Copyright 2012, 2013 David Stutz
+ * Apache License, Version 2.0:
+ * Copyright (c) 2012 - 2018 David Stutz
  *
- * Dual licensed under the BSD-3-Clause and the Apache License, Version 2.0.
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a
+ * copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ * BSD 3-Clause License:
+ * Copyright (c) 2012 - 2018 David Stutz
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *    - Redistributions of source code must retain the above copyright notice,
+ *      this list of conditions and the following disclaimer.
+ *    - Redistributions in binary form must reproduce the above copyright notice,
+ *      this list of conditions and the following disclaimer in the documentation
+ *      and/or other materials provided with the distribution.
+ *    - Neither the name of David Stutz nor the names of its contributors may be
+ *      used to endorse or promote products derived from this software without
+ *      specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
-!function($) {
-
+(function (root, factory) {
+    // check to see if 'knockout' AMD module is specified if using requirejs
+    if (typeof define === 'function' && define.amd &&
+        typeof require === 'function' && typeof require.specified === 'function' && require.specified('knockout')) {
+
+        // AMD. Register as an anonymous module.
+        define(['jquery', 'knockout'], factory);
+    } else {
+        // Browser globals
+        factory(root.jQuery, root.ko);
+    }
+})(this, function ($, ko) {
     "use strict";// jshint ;_;
 
     if (typeof ko !== 'undefined' && ko.bindingHandlers && !ko.bindingHandlers.multiselect) {
         ko.bindingHandlers.multiselect = {
-            init: function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {},
-            update: function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
-
-               var config = ko.utils.unwrapObservable(valueAccessor());
-               var selectOptions = allBindingsAccessor().options;
-               var ms = $(element).data('multiselect');
-
-               if (!ms) {
-                  $(element).multiselect(config);
-               }
-               else {
-                  ms.updateOriginalOptions();
-                  if (selectOptions && selectOptions().length !== ms.originalOptions.length) {
-                     $(element).multiselect('rebuild');
-                  }
-               }
+            after: ['options', 'value', 'selectedOptions', 'enable', 'disable'],
+
+            init: function(element, valueAccessor, allBindings, viewModel, bindingContext) {
+                var $element = $(element);
+                var config = ko.toJS(valueAccessor());
+
+                $element.multiselect(config);
+
+                if (allBindings.has('options')) {
+                    var options = allBindings.get('options');
+                    if (ko.isObservable(options)) {
+                        ko.computed({
+                            read: function() {
+                                options();
+                                setTimeout(function() {
+                                    var ms = $element.data('multiselect');
+                                    if (ms)
+                                        ms.updateOriginalOptions();//Not sure how beneficial this is.
+                                    $element.multiselect('rebuild');
+                                }, 1);
+                            },
+                            disposeWhenNodeIsRemoved: element
+                        });
+                    }
+                }
+
+                //value and selectedOptions are two-way, so these will be triggered even by our own actions.
+                //It needs some way to tell if they are triggered because of us or because of outside change.
+                //It doesn't loop but it's a waste of processing.
+                if (allBindings.has('value')) {
+                    var value = allBindings.get('value');
+                    if (ko.isObservable(value)) {
+                        ko.computed({
+                            read: function() {
+                                value();
+                                setTimeout(function() {
+                                    $element.multiselect('refresh');
+                                }, 1);
+                            },
+                            disposeWhenNodeIsRemoved: element
+                        }).extend({ rateLimit: 100, notifyWhenChangesStop: true });
+                    }
+                }
+
+                //Switched from arrayChange subscription to general subscription using 'refresh'.
+                //Not sure performance is any better using 'select' and 'deselect'.
+                if (allBindings.has('selectedOptions')) {
+                    var selectedOptions = allBindings.get('selectedOptions');
+                    if (ko.isObservable(selectedOptions)) {
+                        ko.computed({
+                            read: function() {
+                                selectedOptions();
+                                setTimeout(function() {
+                                    $element.multiselect('refresh');
+                                }, 1);
+                            },
+                            disposeWhenNodeIsRemoved: element
+                        }).extend({ rateLimit: 100, notifyWhenChangesStop: true });
+                    }
+                }
+
+                var setEnabled = function (enable) {
+                    setTimeout(function () {
+                        if (enable)
+                            $element.multiselect('enable');
+                        else
+                            $element.multiselect('disable');
+                    });
+                };
+
+                if (allBindings.has('enable')) {
+                    var enable = allBindings.get('enable');
+                    if (ko.isObservable(enable)) {
+                        ko.computed({
+                            read: function () {
+                                setEnabled(enable());
+                            },
+                            disposeWhenNodeIsRemoved: element
+                        }).extend({ rateLimit: 100, notifyWhenChangesStop: true });
+                    } else {
+                        setEnabled(enable);
+                    }
+                }
+
+                if (allBindings.has('disable')) {
+                    var disable = allBindings.get('disable');
+                    if (ko.isObservable(disable)) {
+                        ko.computed({
+                            read: function () {
+                                setEnabled(!disable());
+                            },
+                            disposeWhenNodeIsRemoved: element
+                        }).extend({ rateLimit: 100, notifyWhenChangesStop: true });
+                    } else {
+                        setEnabled(!disable);
+                    }
+                }
+
+                ko.utils.domNodeDisposal.addDisposeCallback(element, function() {
+                    $element.multiselect('destroy');
+                });
+            },
+
+            update: function(element, valueAccessor, allBindings, viewModel, bindingContext) {
+                var $element = $(element);
+                var config = ko.toJS(valueAccessor());
+
+                $element.multiselect('setOptions', config);
+                $element.multiselect('rebuild');
             }
         };
     }
 
+    function forEach(array, callback) {
+        for (var index = 0; index < array.length; ++index) {
+            callback(array[index], index);
+        }
+    }
+
     /**
      * Constructor to create a new multiselect using the given select.
-     * 
+     *
      * @param {jQuery} select
      * @param {Object} options
      * @returns {Multiselect}
      */
     function Multiselect(select, options) {
 
-        this.options = this.mergeOptions(options);
         this.$select = $(select);
+        this.options = this.mergeOptions($.extend({}, options, this.$select.data()));
+
+        // Placeholder via data attributes
+        if (this.$select.attr("data-placeholder")) {
+            this.options.nonSelectedText = this.$select.data("placeholder");
+        }
 
         // Initialization.
         // We have to clone to create a new reference.
         this.originalOptions = this.$select.clone()[0].options;
         this.query = '';
         this.searchTimeout = null;
+        this.lastToggledInput = null;
 
         this.options.multiple = this.$select.attr('multiple') === "multiple";
         this.options.onChange = $.proxy(this.options.onChange, this);
+        this.options.onSelectAll = $.proxy(this.options.onSelectAll, this);
+        this.options.onDeselectAll = $.proxy(this.options.onDeselectAll, 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);
+        this.options.onInitialized = $.proxy(this.options.onInitialized, this);
+        this.options.onFiltering = $.proxy(this.options.onFiltering, this);
 
         // Build select all if enabled.
         this.buildContainer();
         this.buildButton();
-        this.buildSelectAll();
         this.buildDropdown();
+        this.buildReset();
+        this.buildSelectAll();
         this.buildDropdownOptions();
         this.buildFilter();
-        
+
         this.updateButtonText();
-        this.updateSelectAll();
-        
-        this.$select.hide().after(this.$container);
-    };
+        this.updateSelectAll(true);
+
+        if (this.options.enableClickableOptGroups && this.options.multiple) {
+            this.updateOptGroups();
+        }
+
+        this.options.wasDisabled = this.$select.prop('disabled');
+        if (this.options.disableIfEmpty && $('option', this.$select).length <= 0) {
+            this.disable();
+        }
+
+        this.$select.wrap('<span class="multiselect-native-select" />').after(this.$container);
+        this.options.onInitialized(this.$select, this.$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.
-             * 
+             * 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>';
+                if (this.disabledText.length > 0
+                        && (select.prop('disabled') || (options.length == 0 && this.disableIfEmpty)))  {
+
+                    return this.disabledText;
                 }
-                else {
-                    if (options.length > this.numberDisplayed) {
-                        return options.length + ' ' + this.nSelectedText + ' <b class="caret"></b>';
+                else if (options.length === 0) {
+                    return this.nonSelectedText;
+                }
+                else if (this.allSelectedText
+                        && options.length === $('option', $(select)).length
+                        && $('option', $(select)).length !== 1
+                        && this.multiple) {
+
+                    if (this.selectAllNumber) {
+                        return this.allSelectedText + ' (' + options.length + ')';
                     }
                     else {
-                        var selected = '';
-                        options.each(function() {
-                            var label = ($(this).attr('label') !== undefined) ? $(this).attr('label') : $(this).html();
-
-                            selected += label + ', ';
-                        });
-                        return selected.substr(0, selected.length - 2) + ' <b class="caret"></b>';
+                        return this.allSelectedText;
                     }
                 }
+                else if (this.numberDisplayed != 0 && options.length > this.numberDisplayed) {
+                    return options.length + ' ' + this.nSelectedText;
+                }
+                else {
+                    var selected = '';
+                    var delimiter = this.delimiterText;
+
+                    options.each(function() {
+                        var label = ($(this).attr('label') !== undefined) ? $(this).attr('label') : $(this).text();
+                        selected += label + delimiter;
+                    });
+
+                    return selected.substr(0, selected.length - this.delimiterText.length);
+                }
             },
             /**
              * Updates the title of the button similar to the buttonText function.
+             *
              * @param {jQuery} options
              * @param {jQuery} select
              * @returns {@exp;selected@call;substr}
@@ -111,25 +297,41 @@
                 }
                 else {
                     var selected = '';
+                    var delimiter = this.delimiterText;
+
                     options.each(function () {
-                        selected += $(this).text() + ', ';
+                        var label = ($(this).attr('label') !== undefined) ? $(this).attr('label') : $(this).text();
+                        selected += label + delimiter;
                     });
-                    return selected.substr(0, selected.length - 2);
+                    return selected.substr(0, selected.length - this.delimiterText.length);
                 }
             },
+            checkboxName: function(option) {
+                return false; // no checkbox name
+            },
             /**
              * Create a label.
-             * 
+             *
              * @param {jQuery} element
              * @returns {String}
              */
-            label: function(element){
-                return $(element).attr('label') || $(element).html();
+            optionLabel: function(element){
+                return $(element).attr('label') || $(element).text();
+            },
+            /**
+             * Create a class.
+             *
+             * @param {jQuery} element
+             * @returns {String}
+             */
+            optionClass: function(element) {
+                return $(element).attr('class') || '';
             },
             /**
              * Triggered on change of the multiselect.
+             *
              * Not triggered when selecting/deselecting options manually.
-             * 
+             *
              * @param {jQuery} option
              * @param {Boolean} checked
              */
@@ -138,7 +340,7 @@
             },
             /**
              * Triggered when the dropdown is shown.
-             * 
+             *
              * @param {jQuery} event
              */
             onDropdownShow: function(event) {
@@ -146,41 +348,106 @@
             },
             /**
              * 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) {
+
+            },
+            /**
+             * Triggered on select all.
+             */
+            onSelectAll: function() {
+
+            },
+            /**
+             * Triggered on deselect all.
+             */
+            onDeselectAll: function() {
+
+            },
+            /**
+             * Triggered after initializing.
+             *
+             * @param {jQuery} $select
+             * @param {jQuery} $container
+             */
+            onInitialized: function($select, $container) {
+
+            },
+            /**
+             * Triggered on filtering.
+             *
+             * @param {jQuery} $filter
+             */
+            onFiltering: function($filter) {
+
+            },
+            enableHTML: false,
             buttonClass: 'btn btn-default',
-            dropRight: false,
-            selectedClass: 'active',
+            inheritClass: false,
             buttonWidth: 'auto',
             buttonContainer: '<div class="btn-group" />',
+            dropRight: false,
+            dropUp: false,
+            selectedClass: 'active',
             // Maximum height of the dropdown menu.
             // If maximum height is exceeded a scrollbar will be displayed.
             maxHeight: false,
             includeSelectAllOption: false,
+            includeSelectAllIfMoreThan: 0,
             selectAllText: ' Select all',
             selectAllValue: 'multiselect-all',
+            selectAllName: false,
+            selectAllNumber: true,
+            selectAllJustVisible: true,
             enableFiltering: false,
             enableCaseInsensitiveFiltering: false,
+            enableFullValueFiltering: false,
+            enableClickableOptGroups: false,
+            enableCollapsibleOptGroups: false,
+            collapseOptGroupsByDefault: false,
             filterPlaceholder: 'Search',
             // possible options: 'text', 'value', 'both'
             filterBehavior: 'text',
+            includeFilterClearBtn: true,
             preventInputChangeEvent: false,
             nonSelectedText: 'None selected',
             nSelectedText: 'selected',
-            numberDisplayed: 3
-        },
-
-        templates: {
-            button: '<button type="button" class="multiselect dropdown-toggle" data-toggle="dropdown"></button>',
-            ul: '<ul class="multiselect-container dropdown-menu"></ul>',
-            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: '<li><a href="javascript:void(0);"><label></label></a></li>',
-            divider: '<li class="divider"></li>',
-            liGroup: '<li><label class="multiselect-group"></label></li>'
+            allSelectedText: 'All selected',
+            numberDisplayed: 3,
+            disableIfEmpty: false,
+            disabledText: '',
+            delimiterText: ', ',
+            includeResetOption: false,
+            includeResetDivider: false,
+            resetText: 'Reset',
+            templates: {
+                button: '<button type="button" class="multiselect dropdown-toggle" data-toggle="dropdown"><span class="multiselect-selected-text"></span> <b class="caret"></b></button>',
+                ul: '<ul class="multiselect-container dropdown-menu"></ul>',
+                filter: '<li class="multiselect-item multiselect-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 tabindex="0"><label></label></a></li>',
+                divider: '<li class="multiselect-item divider"></li>',
+                liGroup: '<li class="multiselect-item multiselect-group"><label></label></li>',
+                resetButton: '<li class="multiselect-reset text-center"><div class="input-group"><a class="btn btn-default btn-block"></a></div></li>'
+            }
         },
 
         constructor: Multiselect,
@@ -192,14 +459,18 @@
             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 = $(this.templates.button).addClass(this.options.buttonClass);
-
+            this.$button = $(this.options.templates.button).addClass(this.options.buttonClass);
+            if (this.$select.attr('class') && this.options.inheritClass) {
+                this.$button.addClass(this.$select.attr('class'));
+            }
             // Adopt active state.
             if (this.$select.prop('disabled')) {
                 this.disable();
@@ -209,9 +480,14 @@
             }
 
             // Manually add button width if set.
-            if (this.options.buttonWidth && this.options.buttonWidth != 'auto') {
+            if (this.options.buttonWidth && this.options.buttonWidth !== 'auto') {
                 this.$button.css({
-                    'width' : this.options.buttonWidth
+                    'width' : '100%', //this.options.buttonWidth,
+                    'overflow' : 'hidden',
+                    'text-overflow' : 'ellipsis'
+                });
+                this.$container.css({
+                    'width': this.options.buttonWidth
                 });
             }
 
@@ -230,7 +506,7 @@
         buildDropdown: function() {
 
             // Build ul.
-            this.$ul = $(this.templates.ul);
+            this.$ul = $(this.options.templates.ul);
 
             if (this.options.dropRight) {
                 this.$ul.addClass('pull-right');
@@ -246,27 +522,46 @@
                 });
             }
 
+            if (this.options.dropUp) {
+
+                var height = Math.min(this.options.maxHeight, $('option[data-role!="divider"]', this.$select).length*26 + $('option[data-role="divider"]', this.$select).length*19 + (this.options.includeSelectAllOption ? 26 : 0) + (this.options.enableFiltering || this.options.enableCaseInsensitiveFiltering ? 44 : 0));
+                var moveCalc = height + 34;
+
+                this.$ul.css({
+                    'max-height': height + 'px',
+                    'overflow-y': 'auto',
+                    'overflow-x': 'hidden',
+                    'margin-top': "-" + moveCalc + 'px'
+                });
+            }
+
             this.$container.append(this.$ul);
         },
 
         /**
-         * Build the dropdown options and binds all nessecary events.
+         * Build the dropdown options and binds all necessary 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')
+                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 ($(element).data('role') === 'divider') {
+                    if ($element.data('role') === 'divider') {
                         this.createDivider();
                     }
                     else {
@@ -274,150 +569,177 @@
                     }
 
                 }
-                
+
                 // 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 checked = $(event.target).prop('checked') || false;
-                var isSelectAllOption = $(event.target).val() === this.options.selectAllValue;
+            $(this.$ul).off('change', 'li:not(.multiselect-group) input[type="checkbox"], li:not(.multiselect-group) input[type="radio"]');
+            $(this.$ul).on('change', 'li:not(.multiselect-group) input[type="checkbox"], li:not(.multiselect-group) input[type="radio"]', $.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) {
-                        $(event.target).parents('li')
+                        $target.closest('li')
                             .addClass(this.options.selectedClass);
                     }
                     else {
-                        $(event.target).parents('li')
+                        $target.closest('li')
                             .removeClass(this.options.selectedClass);
                     }
                 }
 
                 // Get the corresponding option.
-                var value = $(event.target).val();
+                var value = $target.val();
                 var $option = this.getOptionByValue(value);
 
                 var $optionsNotThis = $('option', this.$select).not($option);
-                var $checkboxesNotThis = $('input', this.$container).not($(event.target));
+                var $checkboxesNotThis = $('input', this.$container).not($target);
 
                 if (isSelectAllOption) {
-                    if (this.$select[0][0].value === this.options.selectAllValue) {
-                        var values = [];
-                        var options = $('option[value!="' + this.options.selectAllValue + '"]', this.$select);
-                        for (var i = 0; i < options.length; i++) {
-                            // Additionally check whether the option is visible within the dropcown.
-                            if (options[i].value !== this.options.selectAllValue && this.getInputByValue(options[i].value).is(':visible')) {
-                                values.push(options[i].value);
-                            }
-                        }
 
-                        if (checked) {
-                            this.select(values);
-                        }
-                        else {
-                            this.deselect(values);
-                        }
+                    if (checked) {
+                        this.selectAll(this.options.selectAllJustVisible, true);
+                    }
+                    else {
+                        this.deselectAll(this.options.selectAllJustVisible, true);
                     }
                 }
+                else {
+                    if (checked) {
+                        $option.prop('selected', true);
 
-                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);
+                            }
 
-                    if (this.options.multiple) {
-                        // Simply select additional option.
-                        $option.prop('selected', true);
+                            $($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 all other options and corresponding checkboxes.
-                        if (this.options.selectedClass) {
-                            $($checkboxesNotThis).parents('li').removeClass(this.options.selectedClass);
-                        }
+                        // Unselect option.
+                        $option.prop('selected', false);
+                    }
 
-                        $($checkboxesNotThis).prop('checked', false);
-                        $optionsNotThis.prop('selected', false);
+                    // To prevent select all from firing onChange: #575
+                    this.options.onChange($option, checked);
 
-                        // It's a single selection, so close.
-                        this.$button.click();
-                    }
+                    // Do not update select all or optgroups on select all change!
+                    this.updateSelectAll();
 
-                    if (this.options.selectedClass === "active") {
-                        $optionsNotThis.parents("a").css("outline", "");
+                    if (this.options.enableClickableOptGroups && this.options.multiple) {
+                        this.updateOptGroups();
                     }
                 }
-                else {
-                    // Unselect option.
-                    $option.prop('selected', false);
-                }
 
                 this.$select.change();
-                this.options.onChange($option, checked);
-                
                 this.updateButtonText();
-                this.updateSelectAll();
 
                 if(this.options.preventInputChangeEvent) {
                     return false;
                 }
             }, this));
 
-            $('li a', this.$ul).on('touchstart click', function(event) {
+            $('li a', this.$ul).on('mousedown', function(e) {
+                if (e.shiftKey) {
+                    // Prevent selecting text by Shift+click
+                    return false;
+                }
+            });
+
+            $(this.$ul).on('touchstart click', 'li a', $.proxy(function(event) {
                 event.stopPropagation();
 
-                if (event.shiftKey) {
-                    var checked = $(event.target).prop('checked') || false;
+                var $target = $(event.target);
 
-                    if (checked) {
-                        var prev = $(event.target).parents('li:last')
-                            .siblings('li[class="active"]:first');
-
-                        var currentIdx = $(event.target).parents('li')
-                            .index();
-                        var prevIdx = prev.index();
-
-                        if (currentIdx > prevIdx) {
-                            $(event.target).parents("li:last").prevUntil(prev).each(
-                                function() {
-                                    $(this).find("input:first").prop("checked", true)
-                                        .trigger("change");
-                                }
-                            );
+                if (event.shiftKey && this.options.multiple) {
+                    if($target.is("label")){ // Handles checkbox selection manually (see https://github.com/davidstutz/bootstrap-multiselect/issues/431)
+                        event.preventDefault();
+                        $target = $target.find("input");
+                        $target.prop("checked", !$target.prop("checked"));
+                    }
+                    var checked = $target.prop('checked') || false;
+
+                    if (this.lastToggledInput !== null && this.lastToggledInput !== $target) { // Make sure we actually have a range
+                        var from = this.$ul.find("li:visible").index($target.parents("li"));
+                        var to = this.$ul.find("li:visible").index(this.lastToggledInput.parents("li"));
+
+                        if (from > to) { // Swap the indices
+                            var tmp = to;
+                            to = from;
+                            from = tmp;
                         }
-                        else {
-                            $(event.target).parents("li:last").nextUntil(prev).each(
-                                function() {
-                                    $(this).find("input:first").prop("checked", true)
-                                        .trigger("change");
-                                }
-                            );
+
+                        // Make sure we grab all elements since slice excludes the last index
+                        ++to;
+
+                        // Change the checkboxes and underlying options
+                        var range = this.$ul.find("li").not(".multiselect-filter-hidden").slice(from, to).find("input");
+
+                        range.prop('checked', checked);
+
+                        if (this.options.selectedClass) {
+                            range.closest('li')
+                                .toggleClass(this.options.selectedClass, checked);
+                        }
+
+                        for (var i = 0, j = range.length; i < j; i++) {
+                            var $checkbox = $(range[i]);
+
+                            var $option = this.getOptionByValue($checkbox.val());
+
+                            $option.prop('selected', checked);
                         }
                     }
+
+                    // Trigger the select "change" event
+                    $target.trigger("change");
                 }
 
-                $(event.target).blur();
-            });
+                // Remembers last clicked option
+                if($target.is("input") && !$target.closest("li").is(".multiselect-item")){
+                    this.lastToggledInput = $target;
+                }
+
+                $target.blur();
+            }, this));
 
             // Keyboard support.
-            this.$container.on('keydown', $.proxy(function(event) {
+            this.$container.off('keydown.multiselect').on('keydown.multiselect', $.proxy(function(event) {
                 if ($('input[type="text"]', this.$container).is(':focus')) {
                     return;
                 }
-                if ((event.keyCode === 9 || event.keyCode === 27)
-                        && this.$container.hasClass('open')) {
-                    
-                    // Close on tab or escape.
+
+                if (event.keyCode === 9 && this.$container.hasClass('open')) {
                     this.$button.click();
                 }
                 else {
-                    var $items = $(this.$container).find("li:not(.divider):visible a");
+                    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--;
@@ -444,95 +766,292 @@
                     event.preventDefault();
                 }
             }, this));
+
+            if (this.options.enableClickableOptGroups && this.options.multiple) {
+                $("li.multiselect-group input", this.$ul).on("change", $.proxy(function(event) {
+                    event.stopPropagation();
+
+                    var $target = $(event.target);
+                    var checked = $target.prop('checked') || false;
+
+                    var $li = $(event.target).closest('li');
+                    var $group = $li.nextUntil("li.multiselect-group")
+                        .not('.multiselect-filter-hidden')
+                        .not('.disabled');
+
+                    var $inputs = $group.find("input");
+
+                    var values = [];
+                    var $options = [];
+
+                    if (this.options.selectedClass) {
+                        if (checked) {
+                            $li.addClass(this.options.selectedClass);
+                        }
+                        else {
+                            $li.removeClass(this.options.selectedClass);
+                        }
+                    }
+
+                    $.each($inputs, $.proxy(function(index, input) {
+                        var value = $(input).val();
+                        var $option = this.getOptionByValue(value);
+
+                        if (checked) {
+                            $(input).prop('checked', true);
+                            $(input).closest('li')
+                                .addClass(this.options.selectedClass);
+
+                            $option.prop('selected', true);
+                        }
+                        else {
+                            $(input).prop('checked', false);
+                            $(input).closest('li')
+                                .removeClass(this.options.selectedClass);
+
+                            $option.prop('selected', false);
+                        }
+
+                        $options.push(this.getOptionByValue(value));
+                    }, this))
+
+                    // Cannot use select or deselect here because it would call updateOptGroups again.
+
+                    this.options.onChange($options, checked);
+
+                    this.$select.change();
+                    this.updateButtonText();
+                    this.updateSelectAll();
+                }, this));
+            }
+
+            if (this.options.enableCollapsibleOptGroups && this.options.multiple) {
+                $("li.multiselect-group .caret-container", this.$ul).on("click", $.proxy(function(event) {
+                    var $li = $(event.target).closest('li');
+                    var $inputs = $li.nextUntil("li.multiselect-group")
+                            .not('.multiselect-filter-hidden');
+
+                    var visible = true;
+                    $inputs.each(function() {
+                        visible = visible && !$(this).hasClass('multiselect-collapsible-hidden');
+                    });
+
+                    if (visible) {
+                        $inputs.hide()
+                            .addClass('multiselect-collapsible-hidden');
+                    }
+                    else {
+                        $inputs.show()
+                            .removeClass('multiselect-collapsible-hidden');
+                    }
+                }, this));
+
+                $("li.multiselect-all", this.$ul).css('background', '#f3f3f3').css('border-bottom', '1px solid #eaeaea');
+                $("li.multiselect-all > a > label.checkbox", this.$ul).css('padding', '3px 20px 3px 35px');
+                $("li.multiselect-group > a > input", this.$ul).css('margin', '4px 0px 5px -20px');
+            }
         },
 
         /**
          * Create an option using the given select option.
-         * 
+         *
          * @param {jQuery} element
          */
         createOptionValue: function(element) {
-            if ($(element).is(':selected')) {
-                $(element).prop('selected', true);
+            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 label = this.options.optionLabel(element);
+            var classes = this.options.optionClass(element);
+            var value = $element.val();
             var inputType = this.options.multiple ? "checkbox" : "radio";
 
-            var $li = $(this.templates.li);
-            $('label', $li).addClass(inputType);
-            $('label', $li).append('<input type="' + inputType + '" />');
+            var $li = $(this.options.templates.li);
+            var $label = $('label', $li);
+            $label.addClass(inputType);
+            $label.attr("title", label);
+            $li.addClass(classes);
+
+            // Hide all children items when collapseOptGroupsByDefault is true
+            if (this.options.collapseOptGroupsByDefault && $(element).parent().prop("tagName").toLowerCase() === "optgroup") {
+                $li.addClass("multiselect-collapsible-hidden");
+                $li.hide();
+            }
 
-            var selected = $(element).prop('selected') || false;
-            var $checkbox = $('input', $li);
+            if (this.options.enableHTML) {
+                $label.html(" " + label);
+            }
+            else {
+                $label.text(" " + label);
+            }
+
+            var $checkbox = $('<input/>').attr('type', inputType);
+
+            var name = this.options.checkboxName($element);
+            if (name) {
+                $checkbox.attr('name', name);
+            }
+
+            $label.prepend($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', $li).append(" " + label);
+            $label.attr('title', $element.attr('title'));
 
             this.$ul.append($li);
 
-            if ($(element).is(':disabled')) {
+            if ($element.is(':disabled')) {
                 $checkbox.attr('disabled', 'disabled')
                     .prop('disabled', true)
-                    .parents('li')
+                    .closest('a')
+                    .attr("tabindex", "-1")
+                    .closest('li')
                     .addClass('disabled');
             }
 
             $checkbox.prop('checked', selected);
 
             if (selected && this.options.selectedClass) {
-                $checkbox.parents('li')
+                $checkbox.closest('li')
                     .addClass(this.options.selectedClass);
             }
         },
 
         /**
          * Creates a divider using the given select option.
-         * 
+         *
          * @param {jQuery} element
          */
         createDivider: function(element) {
-            var $divider = $(this.templates.divider);
+            var $divider = $(this.options.templates.divider);
             this.$ul.append($divider);
         },
 
         /**
          * Creates an optgroup.
-         * 
+         *
          * @param {jQuery} group
          */
         createOptgroup: function(group) {
-            var groupName = $(group).prop('label');
+            var label = $(group).attr("label");
+            var value = $(group).attr("value");
+            var $li = $('<li class="multiselect-item multiselect-group"><a href="javascript:void(0);"><label><b></b></label></a></li>');
 
-            // Add a header for the group.
-            var $li = $(this.templates.liGroup);
-            $('label', $li).text(groupName);
+            var classes = this.options.optionClass(group);
+            $li.addClass(classes);
+
+            if (this.options.enableHTML) {
+                $('label b', $li).html(" " + label);
+            }
+            else {
+                $('label b', $li).text(" " + label);
+            }
+
+            if (this.options.enableCollapsibleOptGroups && this.options.multiple) {
+                $('a', $li).append('<span class="caret-container"><b class="caret"></b></span>');
+            }
+
+            if (this.options.enableClickableOptGroups && this.options.multiple) {
+                $('a label', $li).prepend('<input type="checkbox" value="' + value + '"/>');
+            }
+
+            if ($(group).is(':disabled')) {
+                $li.addClass('disabled');
+            }
 
             this.$ul.append($li);
 
-            // Add the options of the group.
-            $('option', group).each($.proxy(function(index, element) {
-                this.createOptionValue(element);
-            }, this));
+            $("option", group).each($.proxy(function($, group) {
+                this.createOptionValue(group);
+            }, this))
+        },
+
+        /**
+         * Build the reset.
+         *
+         */
+        buildReset: function() {
+            if (this.options.includeResetOption) {
+
+                // Check whether to add a divider after the reset.
+                if (this.options.includeResetDivider) {
+                    this.$ul.prepend($(this.options.templates.divider));
+                }
+
+                var $resetButton = $(this.options.templates.resetButton);
+
+                if (this.options.enableHTML) {
+                    $('a', $resetButton).html(this.options.resetText);
+                }
+                else {
+                    $('a', $resetButton).text(this.options.resetText);
+                }
+
+                $('a', $resetButton).click($.proxy(function(){
+                    this.clearSelection();
+                }, this));
+
+                this.$ul.prepend($resetButton);
+            }
         },
 
         /**
-         * Build the selct all.
-         * Checks if a select all ahs already been created.
+         * Build the select 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 options.includeSelectAllOption === true, add the include all checkbox.
-            if (this.options.includeSelectAllOption && this.options.multiple && !alreadyHasSelectAll) {
-                this.$select.prepend('<option value="' + this.options.selectAllValue + '">' + this.options.selectAllText + '</option>');
+
+            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.enableHTML) {
+                    $('label', $li).html(" " + this.options.selectAllText);
+                }
+                else {
+                    $('label', $li).text(" " + this.options.selectAllText);
+                }
+
+                if (this.options.selectAllName) {
+                    $('label', $li).prepend('<input type="checkbox" name="' + this.options.selectAllName + '" />');
+                }
+                else {
+                    $('label', $li).prepend('<input type="checkbox" />');
+                }
+
+                var $checkbox = $('input', $li);
+                $checkbox.val(this.options.selectAllValue);
+
+                $li.addClass("multiselect-item multiselect-all");
+                $checkbox.parent().parent()
+                    .addClass('multiselect-all');
+
+                this.$ul.prepend($li);
+
+                $checkbox.prop('checked', false);
             }
         },
 
@@ -547,13 +1066,39 @@
 
                 if (this.$select.find('option').length >= enableFilterLength) {
 
-                    this.$filter = $(this.templates.filter);
+                    this.$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', $.proxy(function(event){
+                            clearTimeout(this.searchTimeout);
+
+                            this.query = '';
+                            this.$filter.find('.multiselect-search').val('');
+                            $('li', this.$ul).show().removeClass('multiselect-filter-hidden');
+
+                            this.updateSelectAll();
+
+                            if (this.options.enableClickableOptGroups && this.options.multiple) {
+                                this.updateOptGroups();
+                            }
+
+                        }, 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);
 
@@ -562,41 +1107,84 @@
                             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 value = $('input', element).length > 0 ? $('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
+
+                                        // By default lets assume that element is not
+                                        // interesting for this search.
                                         var showElement = false;
 
-                                        var filterCandidate = '';
-                                        if ((this.options.filterBehavior === 'text' || this.options.filterBehavior === 'both')) {
-                                            filterCandidate = text;
-                                        }
-                                        if ((this.options.filterBehavior === 'value' || this.options.filterBehavior === 'both')) {
-                                            filterCandidate = value;
+                                        if (this.options.enableCaseInsensitiveFiltering) {
+                                            filterCandidate = filterCandidate.toLowerCase();
+                                            this.query = this.query.toLowerCase();
                                         }
 
-                                        if (this.options.enableCaseInsensitiveFiltering && filterCandidate.toLowerCase().indexOf(this.query.toLowerCase()) > -1) {
-                                            showElement = true;
+                                        if (this.options.enableFullValueFiltering && this.options.filterBehavior !== 'both') {
+                                            var valueToMatch = filterCandidate.trim().substring(0, this.query.length);
+                                            if (this.query.indexOf(valueToMatch) > -1) {
+                                                showElement = true;
+                                            }
                                         }
                                         else if (filterCandidate.indexOf(this.query) > -1) {
                                             showElement = true;
                                         }
 
-                                        if (showElement) {
-                                            $(element).show();
+                                        // Toggle current element (group or group item) according to showElement boolean.
+                                        if(!showElement){
+                                          $(element).css('display', 'none');
+                                          $(element).addClass('multiselect-filter-hidden');
+                                        }
+                                        if(showElement){
+                                          $(element).css('display', 'block');
+                                          $(element).removeClass('multiselect-filter-hidden');
+                                        }
+
+                                        // Differentiate groups and group items.
+                                        if ($(element).hasClass('multiselect-group')) {
+                                            // Remember group status.
+                                            currentGroup = element;
+                                            currentGroupVisible = showElement;
                                         }
                                         else {
-                                            $(element).hide();
+                                            // Show group name when at least one of its items is visible.
+                                            if (showElement) {
+                                                $(currentGroup).show()
+                                                    .removeClass('multiselect-filter-hidden');
+                                            }
+
+                                            // Show all group items when group name satisfies filter.
+                                            if (!showElement && currentGroupVisible) {
+                                                $(element).show()
+                                                    .removeClass('multiselect-filter-hidden');
+                                            }
                                         }
                                     }
                                 }, this));
                             }
 
-                            // TODO: check whether select all option needs to be updated.
+                            this.updateSelectAll();
+
+                            if (this.options.enableClickableOptGroups && this.options.multiple) {
+                                this.updateOptGroups();
+                            }
+
+                            this.options.onFiltering(event.target);
+
                         }, this), 300, this);
                     }, this));
                 }
@@ -609,22 +1197,31 @@
         destroy: function() {
             this.$container.remove();
             this.$select.show();
+
+            // reset original state
+            this.$select.prop('disabled', this.options.wasDisabled);
+
+            this.$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();
-                });
+        refresh: function () {
+            var inputs = {};
+            $('li input', this.$ul).each(function() {
+              inputs[$(this).val()] = $(this);
+            });
 
-                if ($(element).is(':selected')) {
+            $('option', this.$select).each($.proxy(function (index, element) {
+                var $elem = $(element);
+                var $input = inputs[$(element).val()];
+
+                if ($elem.is(':selected')) {
                     $input.prop('checked', true);
 
                     if (this.options.selectedClass) {
-                        $input.parents('li')
+                        $input.closest('li')
                             .addClass(this.options.selectedClass);
                     }
                 }
@@ -632,118 +1229,332 @@
                     $input.prop('checked', false);
 
                     if (this.options.selectedClass) {
-                        $input.parents('li')
+                        $input.closest('li')
                             .removeClass(this.options.selectedClass);
                     }
                 }
 
-                if ($(element).is(":disabled")) {
+                if ($elem.is(":disabled")) {
                     $input.attr('disabled', 'disabled')
                         .prop('disabled', true)
-                        .parents('li')
+                        .closest('li')
                         .addClass('disabled');
                 }
                 else {
                     $input.prop('disabled', false)
-                        .parents('li')
+                        .closest('li')
                         .removeClass('disabled');
                 }
             }, this));
 
             this.updateButtonText();
             this.updateSelectAll();
+
+            if (this.options.enableClickableOptGroups && this.options.multiple) {
+                this.updateOptGroups();
+            }
         },
 
         /**
          * 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) {
-            if(selectValues && !$.isArray(selectValues)) {
+        select: function(selectValues, triggerOnChange) {
+            if(!$.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.parents('li')
+                    $checkbox.closest('li')
                         .addClass(this.options.selectedClass);
                 }
 
                 $checkbox.prop('checked', true);
                 $option.prop('selected', true);
+
+                if (triggerOnChange) {
+                    this.options.onChange($option, true);
+                }
+            }
+
+            this.updateButtonText();
+            this.updateSelectAll();
+
+            if (this.options.enableClickableOptGroups && this.options.multiple) {
+                this.updateOptGroups();
             }
+        },
 
+        /**
+         * Clears all selected items.
+         */
+        clearSelection: function () {
+            this.deselectAll(false);
             this.updateButtonText();
+            this.updateSelectAll();
+
+            if (this.options.enableClickableOptGroups && this.options.multiple) {
+                this.updateOptGroups();
+            }
         },
 
         /**
          * 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) {
-            if(deselectValues && !$.isArray(deselectValues)) {
+        deselect: function(deselectValues, triggerOnChange) {
+            if(!$.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.parents('li')
+                    $checkbox.closest('li')
                         .removeClass(this.options.selectedClass);
                 }
 
                 $checkbox.prop('checked', false);
                 $option.prop('selected', false);
+
+                if (triggerOnChange) {
+                    this.options.onChange($option, false);
+                }
             }
 
             this.updateButtonText();
+            this.updateSelectAll();
+
+            if (this.options.enableClickableOptGroups && this.options.multiple) {
+                this.updateOptGroups();
+            }
+        },
+
+        /**
+         * Selects all enabled & visible options.
+         *
+         * If justVisible is true or not specified, only visible options are selected.
+         *
+         * @param {Boolean} justVisible
+         * @param {Boolean} triggerOnSelectAll
+         */
+        selectAll: function (justVisible, triggerOnSelectAll) {
+
+            var justVisible = typeof justVisible === 'undefined' ? true : justVisible;
+            var allLis = $("li:not(.divider):not(.disabled):not(.multiselect-group)", this.$ul);
+            var visibleLis = $("li:not(.divider):not(.disabled):not(.multiselect-group):not(.multiselect-filter-hidden):not(.multiselect-collapisble-hidden)", this.$ul).filter(':visible');
+
+            if(justVisible) {
+                $('input:enabled' , visibleLis).prop('checked', true);
+                visibleLis.addClass(this.options.selectedClass);
+
+                $('input:enabled' , visibleLis).each($.proxy(function(index, element) {
+                    var value = $(element).val();
+                    var option = this.getOptionByValue(value);
+                    $(option).prop('selected', true);
+                }, this));
+            }
+            else {
+                $('input:enabled' , allLis).prop('checked', true);
+                allLis.addClass(this.options.selectedClass);
+
+                $('input:enabled' , allLis).each($.proxy(function(index, element) {
+                    var value = $(element).val();
+                    var option = this.getOptionByValue(value);
+                    $(option).prop('selected', true);
+                }, this));
+            }
+
+            $('li input[value="' + this.options.selectAllValue + '"]', this.$ul).prop('checked', true);
+
+            if (this.options.enableClickableOptGroups && this.options.multiple) {
+                this.updateOptGroups();
+            }
+
+            if (triggerOnSelectAll) {
+                this.options.onSelectAll();
+            }
+        },
+
+        /**
+         * Deselects all options.
+         *
+         * If justVisible is true or not specified, only visible options are deselected.
+         *
+         * @param {Boolean} justVisible
+         */
+        deselectAll: function (justVisible, triggerOnDeselectAll) {
+
+            var justVisible = typeof justVisible === 'undefined' ? true : justVisible;
+            var allLis = $("li:not(.divider):not(.disabled):not(.multiselect-group)", this.$ul);
+            var visibleLis = $("li:not(.divider):not(.disabled):not(.multiselect-group):not(.multiselect-filter-hidden):not(.multiselect-collapisble-hidden)", this.$ul).filter(':visible');
+
+            if(justVisible) {
+                $('input[type="checkbox"]:enabled' , visibleLis).prop('checked', false);
+                visibleLis.removeClass(this.options.selectedClass);
+
+                $('input[type="checkbox"]:enabled' , visibleLis).each($.proxy(function(index, element) {
+                    var value = $(element).val();
+                    var option = this.getOptionByValue(value);
+                    $(option).prop('selected', false);
+                }, this));
+            }
+            else {
+                $('input[type="checkbox"]:enabled' , allLis).prop('checked', false);
+                allLis.removeClass(this.options.selectedClass);
+
+                $('input[type="checkbox"]:enabled' , allLis).each($.proxy(function(index, element) {
+                    var value = $(element).val();
+                    var option = this.getOptionByValue(value);
+                    $(option).prop('selected', false);
+                }, this));
+            }
+
+            $('li input[value="' + this.options.selectAllValue + '"]', this.$ul).prop('checked', false);
+
+            if (this.options.enableClickableOptGroups && this.options.multiple) {
+                this.updateOptGroups();
+            }
+
+            if (triggerOnDeselectAll) {
+                this.options.onDeselectAll();
+            }
         },
 
         /**
          * Rebuild the plugin.
+         *
          * Rebuilds the dropdown, the filter and the select all option.
          */
         rebuild: function() {
             this.$ul.html('');
 
-            // Remove select all option in select.
-            $('option[value="' + this.options.selectAllValue + '"]', this.$select).remove();
-
             // 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();
+            this.updateSelectAll(true);
+
+            if (this.options.enableClickableOptGroups && this.options.multiple) {
+                this.updateOptGroups();
+            }
+
+            if (this.options.disableIfEmpty && $('option', this.$select).length <= 0) {
+                this.disable();
+            }
+            else {
+                this.enable();
+            }
+
+            if (this.options.dropRight) {
+                this.$ul.addClass('pull-right');
+            }
         },
 
         /**
          * The provided data will be used to build the dropdown.
-         * 
-         * @param {Array} dataprovider
          */
         dataprovider: function(dataprovider) {
-            var optionDOM = "";
-            dataprovider.forEach(function (option) {
-                optionDOM += '<option value="' + option.value + '">' + option.label + '</option>';
+
+            var groupCounter = 0;
+            var $select = this.$select.empty();
+
+            $.each(dataprovider, function (index, option) {
+                var $tag;
+
+                if ($.isArray(option.children)) { // create optiongroup tag
+                    groupCounter++;
+
+                    $tag = $('<optgroup/>').attr({
+                        label: option.label || 'Group ' + groupCounter,
+                        disabled: !!option.disabled,
+                        value: option.value
+                    });
+
+                    forEach(option.children, function(subOption) { // add children option tags
+                        var attributes = {
+                            value: subOption.value,
+                            label: subOption.label || subOption.value,
+                            title: subOption.title,
+                            selected: !!subOption.selected,
+                            disabled: !!subOption.disabled
+                        };
+
+                        //Loop through attributes object and add key-value for each attribute
+                       for (var key in subOption.attributes) {
+                            attributes['data-' + key] = subOption.attributes[key];
+                       }
+                         //Append original attributes + new data attributes to option
+                        $tag.append($('<option/>').attr(attributes));
+                    });
+                }
+                else {
+
+                    var attributes = {
+                        'value': option.value,
+                        'label': option.label || option.value,
+                        'title': option.title,
+                        'class': option['class'],
+                        'selected': !!option['selected'],
+                        'disabled': !!option['disabled']
+                    };
+                    //Loop through attributes object and add key-value for each attribute
+                    for (var key in option.attributes) {
+                      attributes['data-' + key] = option.attributes[key];
+                    }
+                    //Append original attributes + new data attributes to option
+                    $tag = $('<option/>').attr(attributes);
+
+                    $tag.text(option.label || option.value);
+                }
+
+                $select.append($tag);
             });
 
-            this.$select.html(optionDOM);
             this.rebuild();
         },
 
@@ -767,7 +1578,7 @@
 
         /**
          * Set the options.
-         * 
+         *
          * @param {Array} options
          */
         setOptions: function(options) {
@@ -776,86 +1587,142 @@
 
         /**
          * Merges the given options with the default options.
-         * 
+         *
          * @param {Array} options
          * @returns {Array}
          */
         mergeOptions: function(options) {
-            return $.extend({}, this.defaults, options);
+            return $.extend(true, {}, this.defaults, this.options, options);
         },
-        
+
         /**
-         * Checks whether a select all option is present.
-         * 
+         * Checks whether a select all checkbox is present.
+         *
          * @returns {Boolean}
          */
         hasSelectAll: function() {
-            return this.$select[0][0] ? this.$select[0][0].value === this.options.selectAllValue : false;
+            return $('li.multiselect-all', this.$ul).length > 0;
+        },
+
+        /**
+         * Update opt groups.
+         */
+        updateOptGroups: function() {
+            var $groups = $('li.multiselect-group', this.$ul)
+            var selectedClass = this.options.selectedClass;
+
+            $groups.each(function() {
+                var $options = $(this).nextUntil('li.multiselect-group')
+                    .not('.multiselect-filter-hidden')
+                    .not('.disabled');
+
+                var checked = true;
+                $options.each(function() {
+                    var $input = $('input', this);
+
+                    if (!$input.prop('checked')) {
+                        checked = false;
+                    }
+                });
+
+                if (selectedClass) {
+                    if (checked) {
+                        $(this).addClass(selectedClass);
+                    }
+                    else {
+                        $(this).removeClass(selectedClass);
+                    }
+                }
+
+                $('input', this).prop('checked', checked);
+            });
         },
-        
+
         /**
-         * Updates the select all option based on the currently selected options.
+         * Updates the select all checkbox based on the currently displayed and selected checkboxes.
          */
-        updateSelectAll: function() {
+        updateSelectAll: function(notTriggerOnSelectAll) {
             if (this.hasSelectAll()) {
-                var selected = this.getSelected();
-                
-                if (selected.length === $('option', this.$select).length - 1) {
-                    this.select(this.options.selectAllValue);
+                var allBoxes = $("li:not(.multiselect-item):not(.multiselect-filter-hidden):not(.multiselect-group):not(.disabled) input:enabled", this.$ul);
+                var allBoxesLength = allBoxes.length;
+                var checkedBoxesLength = allBoxes.filter(":checked").length;
+                var selectAllLi  = $("li.multiselect-all", this.$ul);
+                var selectAllInput = selectAllLi.find("input");
+
+                if (checkedBoxesLength > 0 && checkedBoxesLength === allBoxesLength) {
+                    selectAllInput.prop("checked", true);
+                    selectAllLi.addClass(this.options.selectedClass);
                 }
                 else {
-                    this.deselect(this.options.selectAllValue);
+                    selectAllInput.prop("checked", false);
+                    selectAllLi.removeClass(this.options.selectedClass);
                 }
             }
         },
-        
+
         /**
-         * Update the button text and its title base don the currenty selected options.
+         * 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.
-            $('button', this.$container).html(this.options.buttonText(options, this.$select));
-            
-            // Now update the title attribute of the button.
-            $('button', this.$container).attr('title', this.options.buttonTitle(options, this.$select));
+            if (this.options.enableHTML) {
+                $('.multiselect .multiselect-selected-text', this.$container).html(this.options.buttonText(options, this.$select));
+            }
+            else {
+                $('.multiselect .multiselect-selected-text', this.$container).text(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 $('option[value!="' + this.options.selectAllValue + '"]:selected', this.$select).filter(function() {
-                return $(this).prop('selected');
-            });
+            return $('option', this.$select).filter(":selected");
         },
 
         /**
          * Gets a select option by its value.
-         * 
+         *
          * @param {String} value
          * @returns {jQuery}
          */
-        getOptionByValue: function(value) {
-            return $('option', this.$select).filter(function() {
-                return $(this).val() === value;
-            });
+        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) {
-            return $('li input', this.$ul).filter(function() {
-                return $(this).val() === value;
-            });
+        getInputByValue: function (value) {
+
+            var checkboxes = $('li input:not(.multiselect-search)', this.$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);
+                }
+            }
         },
 
         /**
@@ -870,22 +1737,32 @@
             return setTimeout(function() {
                 callback.apply(self || window, args);
             }, timeout);
+        },
+
+        setAllSelectedText: function(allSelectedText) {
+            this.options.allSelectedText = allSelectedText;
+            this.updateButtonText();
         }
     };
 
-    $.fn.multiselect = function(option, parameter) {
+    $.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) {
-                $(this).data('multiselect', ( data = new Multiselect(this, options)));
+                data = new Multiselect(this, options);
+                $(this).data('multiselect', data);
             }
 
             // Call multiselect method.
             if (typeof option === 'string') {
-                data[option](parameter);
+                data[option](parameter, extraOptions);
+
+                if (option === 'destroy') {
+                    $(this).data('multiselect', false);
+                }
             }
         });
     };
@@ -896,4 +1773,4 @@
         $("select[data-role=multiselect]").multiselect();
     });
 
-}(window.jQuery);
+});