diff --git a/Gruntfile.js b/Gruntfile.js
index b269b7a..10a704a 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -51,7 +51,7 @@ module.exports = function(grunt) {
         },
 
         files: {
-          'dist/jquery.tree-multiselect.min.css': 'src/style.scss'
+          'dist/jquery.tree-multiselect.min.css': 'sass/style.scss'
         }
       },
 
@@ -61,7 +61,7 @@ module.exports = function(grunt) {
         },
 
         files: {
-          'dist/jquery.tree-multiselect.css': 'src/style.scss'
+          'dist/jquery.tree-multiselect.css': 'sass/style.scss'
         }
       }
     },
diff --git a/README.md b/README.md
index c2bf2cc..0d111d9 100644
--- a/README.md
+++ b/README.md
@@ -79,6 +79,7 @@ Name                    | Default        | Description
 `unselectAllText`       | `Unselect All` | Only used if `enableSelectAll` is active
 `freeze`                | `false`        | Disables selection/deselection of options; aka display-only
 `hideSidePanel`         | `false`        | Hide the right panel showing all the selected items
+`maxSelections`         | `0`            | A number that sets the maximum number of options that can be selected. Any positive integer is valid; anything else (such as `0` or `-1`) means no limit
 `onChange`              | `null`         | Callback for when select is changed. Called with (allSelectedItems, addedItems, removedItems), each of which is an array of objects with the properties `text`, `value`, `initialIndex`, and `section`
 `onlyBatchSelection`    | `false`        | Only sections can be checked, not individual items
 `sortable`              | `false`        | Selected options can be sorted by dragging (requires jQuery UI)
diff --git a/conf/karma.js b/conf/karma.js
index a18950f..e31e7a1 100644
--- a/conf/karma.js
+++ b/conf/karma.js
@@ -62,7 +62,7 @@ module.exports = function(config) {
       ],
 
       paths: [
-        'src',
+        'src/tree-multiselect',
         'node_modules'
       ]
     },
diff --git a/dist/jquery.tree-multiselect.css b/dist/jquery.tree-multiselect.css
index b8ecb8d..52be481 100644
--- a/dist/jquery.tree-multiselect.css
+++ b/dist/jquery.tree-multiselect.css
@@ -1,4 +1,4 @@
-/* jQuery Tree Multiselect v2.5.0 | (c) Patrick Tsai | MIT Licensed */
+/* jQuery Tree Multiselect v2.5.1 | (c) Patrick Tsai | MIT Licensed */
 div.tree-multiselect {
   border: 2px solid #D8D8D8;
   border-radius: 5px;
diff --git a/dist/jquery.tree-multiselect.js b/dist/jquery.tree-multiselect.js
index 91dbe3d..0b97702 100644
--- a/dist/jquery.tree-multiselect.js
+++ b/dist/jquery.tree-multiselect.js
@@ -1,35 +1,39 @@
-/* jQuery Tree Multiselect v2.5.0 | (c) Patrick Tsai | MIT Licensed */
+/* jQuery Tree Multiselect v2.5.1 | (c) Patrick Tsai | MIT Licensed */
 (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
 'use strict';
 
-var Util = require('./utility');
+(function ($) {
+  'use strict';
 
-function Section(obj) {
-  obj = obj || {};
+  $.fn.treeMultiselect = require('./tree-multiselect/main');
+})(jQuery);
 
-  this.treeId = obj.treeId;
-  this.id = obj.id;
-  this.name = obj.name;
-  this.items = [];
+},{"./tree-multiselect/main":5}],2:[function(require,module,exports){
+'use strict';
 
-  this.node = null;
-}
+var Item = require('./item');
+var Section = require('./section');
 
-Section.prototype.isSection = function () {
-  return true;
+exports.createLookup = function (arr) {
+  return {
+    arr: arr,
+    children: {}
+  };
 };
 
-Section.prototype.isItem = function () {
-  return false;
+exports.createSection = function (obj) {
+  return new Section(obj);
 };
 
-Section.prototype.render = function (createCheckboxes, disableCheckboxes) {
-  if (!this.node) {
-    this.node = Util.dom.createSection(this, createCheckboxes, disableCheckboxes);
-  }
-  return this.node;
+exports.createItem = function (obj) {
+  return new Item(obj);
 };
 
+},{"./item":3,"./section":4}],3:[function(require,module,exports){
+'use strict';
+
+var Util = require('../utility');
+
 function Item(obj) {
   obj = obj || {};
 
@@ -61,22 +65,42 @@ Item.prototype.render = function (createCheckboxes, disableCheckboxes) {
   return this.node;
 };
 
-exports.createLookup = function (arr) {
-  return {
-    arr: arr,
-    children: {}
-  };
+module.exports = Item;
+
+},{"../utility":11}],4:[function(require,module,exports){
+'use strict';
+
+var Util = require('../utility');
+
+function Section(obj) {
+  obj = obj || {};
+
+  this.treeId = obj.treeId;
+  this.id = obj.id;
+  this.name = obj.name;
+  this.items = [];
+
+  this.node = null;
+}
+
+Section.prototype.isSection = function () {
+  return true;
 };
 
-exports.createSection = function (obj) {
-  return new Section(obj);
+Section.prototype.isItem = function () {
+  return false;
 };
 
-exports.createItem = function (obj) {
-  return new Item(obj);
+Section.prototype.render = function (createCheckboxes, disableCheckboxes) {
+  if (!this.node) {
+    this.node = Util.dom.createSection(this, createCheckboxes, disableCheckboxes);
+  }
+  return this.node;
 };
 
-},{"./utility":9}],2:[function(require,module,exports){
+module.exports = Section;
+
+},{"../utility":11}],5:[function(require,module,exports){
 'use strict';
 
 var Tree = require('./tree');
@@ -118,6 +142,7 @@ function mergeDefaultOptions(options) {
     unselectAllText: 'Unselect All',
     freeze: false,
     hideSidePanel: false,
+    maxSelections: 0,
     onChange: null,
     onlyBatchSelection: false,
     searchable: false,
@@ -132,7 +157,7 @@ function mergeDefaultOptions(options) {
 
 module.exports = treeMultiselect;
 
-},{"./tree":5}],3:[function(require,module,exports){
+},{"./tree":7}],6:[function(require,module,exports){
 'use strict';
 
 var Util = require('./utility');
@@ -308,16 +333,7 @@ function splitWord(word) {
 
 module.exports = Search;
 
-},{"./utility":9}],4:[function(require,module,exports){
-'use strict';
-
-(function ($) {
-  'use strict';
-
-  $.fn.treeMultiselect = require('./main');
-})(jQuery);
-
-},{"./main":2}],5:[function(require,module,exports){
+},{"./utility":11}],7:[function(require,module,exports){
 'use strict';
 
 function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } else { return Array.from(arr); } }
@@ -707,6 +723,25 @@ Tree.prototype.render = function (noCallbacks) {
   Util.array.subtract(this.keysToAdd, this.selectedKeys);
   Util.array.intersect(this.keysToRemove, this.selectedKeys);
 
+  // check for max number of selections
+  if (Util.isInteger(this.params.maxSelections) && this.params.maxSelections > 0) {
+    var currentLength = this.keysToAdd.length - this.keysToRemove.length + this.selectedKeys.length;
+    if (currentLength > this.params.maxSelections) {
+      var _keysToRemove;
+
+      var lengthToCut = currentLength - this.params.maxSelections;
+      var keysToCut = [];
+      if (lengthToCut > this.selectedKeys.length) {
+        keysToCut.push.apply(keysToCut, _toConsumableArray(this.selectedKeys));
+        lengthToCut -= this.selectedKeys.length;
+        keysToCut.push.apply(keysToCut, _toConsumableArray(this.keysToAdd.splice(0, lengthToCut)));
+      } else {
+        keysToCut.push.apply(keysToCut, _toConsumableArray(this.selectedKeys.slice(0, lengthToCut)));
+      }
+      (_keysToRemove = this.keysToRemove).push.apply(_keysToRemove, keysToCut);
+    }
+  }
+
   // remove items first
   for (var ii = 0; ii < this.keysToRemove.length; ++ii) {
     // remove the selected divs
@@ -758,6 +793,8 @@ Tree.prototype.render = function (noCallbacks) {
     valHash[value] = kk;
   }
   // TODO is there a better way to sort the values other than by HTML?
+  // NOTE: the following does not work since jQuery duplicates option values with the same value
+  // this.$originalSelect.val(vals);
   var options = this.$originalSelect.find('option').toArray();
   options.sort(function (a, b) {
     var aValue = valHash[a.value] || 0;
@@ -769,8 +806,6 @@ Tree.prototype.render = function (noCallbacks) {
   this.$originalSelect.find('option').each(function (idx, el) {
     this.selected = !!originalValsHash[Util.getKey(el)];
   });
-  // NOTE: the following does not work since jQuery duplicates option values with the same value
-  //this.$originalSelect.val(vals).change();
   this.$originalSelect.change();
 
   if (!noCallbacks && this.params.onChange) {
@@ -792,7 +827,7 @@ Tree.prototype.render = function (noCallbacks) {
 
 module.exports = Tree;
 
-},{"./ast":1,"./search":3,"./ui-builder":6,"./utility":9}],6:[function(require,module,exports){
+},{"./ast":2,"./search":6,"./ui-builder":8,"./utility":11}],8:[function(require,module,exports){
 'use strict';
 
 function UiBuilder($el, hideSidePanel) {
@@ -825,7 +860,7 @@ UiBuilder.prototype.remove = function () {
 
 module.exports = UiBuilder;
 
-},{}],7:[function(require,module,exports){
+},{}],9:[function(require,module,exports){
 "use strict";
 
 // keeps if pred is true
@@ -954,7 +989,7 @@ exports.intersectMany = function (arrays) {
   return finalOutput;
 };
 
-},{}],8:[function(require,module,exports){
+},{}],10:[function(require,module,exports){
 'use strict';
 
 exports.createNode = function (tag, props) {
@@ -1060,7 +1095,7 @@ exports.createSection = function (astSection, createCheckboxes, disableCheckboxe
   return sectionNode;
 };
 
-},{}],9:[function(require,module,exports){
+},{}],11:[function(require,module,exports){
 'use strict';
 
 exports.array = require('./array');
@@ -1078,4 +1113,13 @@ exports.getKey = function (el) {
   return parseInt(el.getAttribute('data-key'));
 };
 
-},{"./array":7,"./dom":8}]},{},[4]);
+exports.isInteger = function (value) {
+  var x;
+  if (isNaN(value)) {
+    return false;
+  }
+  x = parseFloat(value);
+  return (x | 0) === x;
+};
+
+},{"./array":9,"./dom":10}]},{},[1]);
diff --git a/dist/jquery.tree-multiselect.min.css b/dist/jquery.tree-multiselect.min.css
index 612e4d3..8232de5 100644
--- a/dist/jquery.tree-multiselect.min.css
+++ b/dist/jquery.tree-multiselect.min.css
@@ -1,2 +1,2 @@
-/* jQuery Tree Multiselect v2.5.0 | (c) Patrick Tsai | MIT Licensed */
+/* jQuery Tree Multiselect v2.5.1 | (c) Patrick Tsai | MIT Licensed */
 div.tree-multiselect{border:2px solid #D8D8D8;border-radius:5px;display:table;height:inherit;width:100%}div.tree-multiselect>div.selected,div.tree-multiselect>div.selections{display:inline-block;box-sizing:border-box;overflow:auto;padding:1%;vertical-align:top;width:50%}div.tree-multiselect>div.selections{border-right:solid 2px #D8D8D8}div.tree-multiselect>div.selections div.item{margin-left:16px}div.tree-multiselect>div.selections div.item label{cursor:pointer;display:inline}div.tree-multiselect>div.selections div.item label.disabled{color:#D8D8D8}div.tree-multiselect>div.selections.no-border{border-right:none}div.tree-multiselect>div.selected>div.item{background:#EAEAEA;border-radius:2px;padding:2px 5px;overflow:auto}div.tree-multiselect>div.selected.ui-sortable>div.item:hover{cursor:move}div.tree-multiselect div.section>div.section,div.tree-multiselect div.section>div.item{padding-left:20px}div.tree-multiselect div.section.collapsed>div.title span.collapse-section:after{content:"+"}div.tree-multiselect div.section.collapsed:not([searchhit])>.item,div.tree-multiselect div.section.collapsed:not([searchhit])>.section{display:none}div.tree-multiselect div.title,div.tree-multiselect div.item{margin-bottom:2px}div.tree-multiselect div.title{background:#777;color:white;padding:2px}div.tree-multiselect div.title>*{display:inline-block}div.tree-multiselect div.title>span.collapse-section{margin:0 3px;width:8px}div.tree-multiselect div.title>span.collapse-section:after{content:"-"}div.tree-multiselect div.title:hover{cursor:pointer}div.tree-multiselect input[type=checkbox]{display:inline;margin-right:5px}div.tree-multiselect input[type=checkbox]:not([disabled]):hover{cursor:pointer}div.tree-multiselect span.remove-selected,div.tree-multiselect span.description{background:#777;border-radius:2px;color:white;margin-right:5px;padding:0 3px}div.tree-multiselect span.remove-selected:hover{cursor:pointer}div.tree-multiselect span.description:hover{cursor:help}div.tree-multiselect div.temp-description-popup{background:#EAEAEA;border:2px solid #676767;border-radius:3px;padding:5px}div.tree-multiselect span.section-name{float:right;font-style:italic}div.tree-multiselect .auxiliary{display:table;width:100%}div.tree-multiselect .auxiliary input.search{border:2px solid #D8D8D8;display:table-cell;margin:0;padding:5px;width:100%}div.tree-multiselect .auxiliary .select-all-container{display:table-cell;text-align:right}div.tree-multiselect .auxiliary .select-all-container span.select-all,div.tree-multiselect .auxiliary .select-all-container span.unselect-all{margin-right:5px;padding-right:5px}div.tree-multiselect .auxiliary .select-all-container span.select-all:hover,div.tree-multiselect .auxiliary .select-all-container span.unselect-all:hover{cursor:pointer}div.tree-multiselect .auxiliary .select-all-container span.select-all{border-right:2px solid #D8D8D8}
diff --git a/dist/jquery.tree-multiselect.min.js b/dist/jquery.tree-multiselect.min.js
index 48b47f7..5c69ed6 100644
--- a/dist/jquery.tree-multiselect.min.js
+++ b/dist/jquery.tree-multiselect.min.js
@@ -1,2 +1,2 @@
-/* jQuery Tree Multiselect v2.5.0 | (c) Patrick Tsai | MIT Licensed */
-!function e(t,i,s){function n(a,o){if(!i[a]){if(!t[a]){var c="function"==typeof require&&require;if(!o&&c)return c(a,!0);if(r)return r(a,!0);var l=new Error("Cannot find module '"+a+"'");throw l.code="MODULE_NOT_FOUND",l}var d=i[a]={exports:{}};t[a][0].call(d.exports,function(e){var i=t[a][1][e];return n(i||e)},d,d.exports,e,t,i,s)}return i[a].exports}for(var r="function"==typeof require&&require,a=0;a<s.length;a++)n(s[a]);return n}({1:[function(e,t,i){"use strict";function s(e){e=e||{},this.treeId=e.treeId,this.id=e.id,this.name=e.name,this.items=[],this.node=null}function n(e){e=e||{},this.treeId=e.treeId,this.id=e.id,this.value=e.value,this.text=e.text,this.description=e.description,this.initialIndex=e.initialIndex?parseInt(e.initialIndex):null,this.section=e.section,this.disabled=e.disabled,this.selected=e.selected,this.node=null}var r=e("./utility");s.prototype.isSection=function(){return!0},s.prototype.isItem=function(){return!1},s.prototype.render=function(e,t){return this.node||(this.node=r.dom.createSection(this,e,t)),this.node},n.prototype.isSection=function(){return!1},n.prototype.isItem=function(){return!0},n.prototype.render=function(e,t){return this.node||(this.node=r.dom.createSelection(this,e,t)),this.node},i.createLookup=function(e){return{arr:e,children:{}}},i.createSection=function(e){return new s(e)},i.createItem=function(e){return new n(e)}},{"./utility":9}],2:[function(e,t,i){"use strict";function s(e){var t={allowBatchSelection:!0,collapsible:!0,enableSelectAll:!1,selectAllText:"Select All",unselectAllText:"Unselect All",freeze:!1,hideSidePanel:!1,onChange:null,onlyBatchSelection:!1,searchable:!1,searchParams:["value","text","description","section"],sectionDelimiter:"/",showSectionOnSelected:!0,sortable:!1,startCollapsed:!1};return jQuery.extend({},t,e)}var n=e("./tree"),r=0;t.exports=function(e){var t=this,i=s(e);return this.map(function(){var e=t;e.attr("multiple","").css("display","none");var s=new n(r,e,i);return s.initialize(),++r,{reload:function(){s.reload()},remove:function(){s.remove()}}})}},{"./tree":5}],3:[function(e,t,i){"use strict";function s(e,t,i){this.index={},this.astItems=e,this.astItemKeys=Object.keys(e),this.astSections=t,this.astSectionKeys=Object.keys(t),this.setSearchParams(i),this.buildIndex()}function n(e){if(r.assert(e),e.length<a)return[e];for(var t=[],i=0;i<e.length-a+1;++i)t.push(e.substring(i,i+a));return t}var r=e("./utility"),a=3;s.prototype.setSearchParams=function(e){r.assert(Array.isArray(e));var t={value:!0,text:!0,description:!0,section:!0};this.searchParams=[];for(var i=0;i<e.length;++i)t[e[i]]&&this.searchParams.push(e[i])},s.prototype.buildIndex=function(){var e=this;for(var t in this.astItems)!function(t){var i=e.astItems[t],s=[];e.searchParams.forEach(function(e){s.push(i[e])}),r.array.removeFalseyExceptZero(s),s.map(function(e){return e.toLowerCase()}).forEach(function(t){t.split(" ").forEach(function(t){e._addToIndex(t,i.id)})})}(t)},s.prototype._addToIndex=function(e,t){for(var i=1;i<=a;++i)for(var s=0;s<e.length-i+1;++s){var n=e.substring(s,s+i);this.index[n]||(this.index[n]=[]);var r=this.index[n].length;0!==r&&this.index[n][r-1]===t||this.index[n].push(t)}},s.prototype.search=function(e){var t=this;if(!e)return this.astItemKeys.forEach(function(e){t.astItems[e].node.style.display=""}),void this.astSectionKeys.forEach(function(e){t.astSections[e].node.style.display="",t.astSections[e].node.removeAttribute("searchhit")});var i=[];(e=e.toLowerCase()).split(" ").forEach(function(e){n(e).forEach(function(e){i.push(t.index[e]||[])})});var s=r.array.intersectMany(i);this._handleNodeVisbilities(s)},s.prototype._handleNodeVisbilities=function(e){var t=this,i={},s={};e.forEach(function(e){i[e]=!0;var n=t.astItems[e].node;for(n.style.display="",n=n.parentNode;!n.className.match(/tree-multiselect/);){if(n.className.match(/section/)){var a=r.getKey(n);if(r.assert(a||0===a),s[a])break;s[a]=!0,n.style.display="",n.setAttribute("searchhit",!0)}n=n.parentNode}}),this.astItemKeys.forEach(function(e){i[e]||(t.astItems[e].node.style.display="none")}),this.astSectionKeys.forEach(function(e){s[e]||(t.astSections[e].node.style.display="none")})},t.exports=s},{"./utility":9}],4:[function(e,t,i){"use strict";jQuery.fn.treeMultiselect=e("./main")},{"./main":2}],5:[function(e,t,i){"use strict";function s(e){if(Array.isArray(e)){for(var t=0,i=Array(e.length);t<e.length;t++)i[t]=e[t];return i}return Array.from(e)}function n(e,t,i){this.id=e,this.$originalSelect=t,this.params=i,this.resetState()}var r=e("./ast"),a=e("./search"),o=e("./ui-builder"),c=e("./utility");n.prototype.initialize=function(){if(this.generateSelections(this.$selectionContainer[0]),this.popupDescriptionHover(),this.params.allowBatchSelection&&this.handleSectionCheckboxMarkings(),this.params.collapsible&&this.addCollapsibility(),this.params.searchable||this.params.enableSelectAll){var e=c.dom.createNode("div",{class:"auxiliary"});this.$selectionContainer.prepend(e,this.$selectionContainer.firstChild),this.params.searchable&&this.createSearchBar(e),this.params.enableSelectAll&&this.createSelectAllButtons(e)}this.armRemoveSelectedOnClick(),this.updateSelectedAndOnChange(),this.render(!0),this.uiBuilder.attach()},n.prototype.remove=function(){this.uiBuilder.remove(),this.resetState()},n.prototype.reload=function(){this.remove(),this.initialize()},n.prototype.resetState=function(){this.uiBuilder=new o(this.$originalSelect,this.params.hideSidePanel),this.$treeContainer=this.uiBuilder.$treeContainer,this.$selectionContainer=this.uiBuilder.$selectionContainer,this.$selectedContainer=this.uiBuilder.$selectedContainer,this.astItems={},this.astSections={},this.selectedNodes={},this.selectedKeys=[],this.keysToAdd=[],this.keysToRemove=[]},n.prototype.generateSelections=function(e){var t=this.$originalSelect.children("option"),i=this.createAst(t);this.generateHtml(i,e)},n.prototype.createAst=function(e){var t,i=[],s=r.createLookup(i),n=this,a=0,o=0,l=[],d=[];return e.each(function(){var e=this;e.setAttribute("data-key",a);var t=r.createItem({treeId:n.id,id:a,value:e.value,text:e.text,description:e.getAttribute("data-description"),initialIndex:e.getAttribute("data-index"),section:e.getAttribute("data-section"),disabled:e.hasAttribute("readonly"),selected:e.hasAttribute("selected")});t.initialIndex&&t.selected?(l[t.initialIndex]=l[t.initialIndex]||[],l[t.initialIndex].push(a)):t.selected&&d.push(a),n.astItems[a]=t,++a;for(var i=s,c=t.section,h=c&&c.length>0?c.split(n.params.sectionDelimiter):[],u=0;u<h.length;++u){var p=h[u];if(i.children[p])i=i.children[p];else{var f=r.createSection({treeId:n.id,id:o,name:p});++o,i.arr.push(f);var v=r.createLookup(f.items);i.children[p]=v,i=v}}i.arr.push(t)}),this.keysToAdd=c.array.flatten(l),c.array.removeFalseyExceptZero(this.keysToAdd),(t=this.keysToAdd).push.apply(t,d),c.array.uniq(this.keysToAdd),i},n.prototype.generateHtml=function(e,t){for(var i=0;i<e.length;++i){var s=e[i];if(s.isSection()){this.astSections[s.id]=s;var n=this.params.allowBatchSelection,r=this.params.freeze,a=s.render(n,r);t.appendChild(a),this.generateHtml(s.items,a)}else if(s.isItem()){this.astItems[s.id]=s;var o=!this.params.onlyBatchSelection,c=this.params.freeze,l=s.render(o,c);t.appendChild(l)}}},n.prototype.popupDescriptionHover=function(){this.$selectionContainer.on("mouseenter","div.item > span.description",function(){var e=jQuery(this).parent(),t=e.attr("data-description"),i=document.createElement("div");i.className="temp-description-popup",i.innerHTML=t,i.style.position="absolute",e.append(i)}),this.$selectionContainer.on("mouseleave","div.item > span.description",function(){jQuery(this).parent().find("div.temp-description-popup").remove()})},n.prototype.handleSectionCheckboxMarkings=function(){var e=this;this.$selectionContainer.on("click","input.section[type=checkbox]",function(){var t=jQuery(this).closest("div.section").find("div.item").map(function(t,i){var s=c.getKey(i);if(!e.astItems[s].disabled)return s}).get();if(this.checked){var i;(i=e.keysToAdd).push.apply(i,s(t)),c.array.uniq(e.keysToAdd)}else{var n;(n=e.keysToRemove).push.apply(n,s(t)),c.array.uniq(e.keysToRemove)}e.render()})},n.prototype.redrawSectionCheckboxes=function(e){var t=3,i=this;if((e=e||this.$selectionContainer).find("> div.section").each(function(){var e=i.redrawSectionCheckboxes(jQuery(this));t&=e}),t)for(var s=e.find("> div.item > input[type=checkbox]"),n=0;n<s.length&&(s[n].disabled||(s[n].checked?t&=-3:t&=-2),0!==t);++n);var r=e.find("> div.title > input[type=checkbox]");return r.length&&(r=r[0],1&t?(r.checked=!0,r.indeterminate=!1):2&t?(r.checked=!1,r.indeterminate=!1):(r.checked=!1,r.indeterminate=!0)),t},n.prototype.addCollapsibility=function(){var e=this.$selectionContainer.find("div.title"),t=c.dom.createNode("span",{class:"collapse-section"});e.prepend(t);var i=this.$selectionContainer.find("div.section");this.params.startCollapsed&&i.addClass("collapsed"),this.$selectionContainer.on("click","div.title",function(e){"INPUT"!==e.target.nodeName&&(jQuery(this).parent().toggleClass("collapsed"),e.stopPropagation())})},n.prototype.createSearchBar=function(e){var t=new a(this.astItems,this.astSections,this.params.searchParams),i=c.dom.createNode("input",{class:"search",placeholder:"Search..."});e.appendChild(i),this.$selectionContainer.on("input","input.search",function(){var e=this.value;t.search(e)})},n.prototype.createSelectAllButtons=function(e){var t=c.dom.createNode("span",{class:"select-all",text:this.params.selectAllText}),i=c.dom.createNode("span",{class:"unselect-all",text:this.params.unselectAllText}),n=c.dom.createNode("div",{class:"select-all-container"});n.appendChild(t),n.appendChild(i),e.appendChild(n);var r=this;this.$selectionContainer.on("click","span.select-all",function(){r.keysToAdd=Object.keys(r.astItems),r.render()}),this.$selectionContainer.on("click","span.unselect-all",function(){var e;(e=r.keysToRemove).push.apply(e,s(r.selectedKeys)),r.render()})},n.prototype.armRemoveSelectedOnClick=function(){var e=this;this.$selectedContainer.on("click","span.remove-selected",function(){var t=this.parentNode,i=c.getKey(t);e.keysToRemove.push(i),e.render()})},n.prototype.updateSelectedAndOnChange=function(){var e=this;if(this.$selectionContainer.on("click","input.option[type=checkbox]",function(){var t=this,i=t.parentNode,s=c.getKey(i);c.assert(s||0===s),t.checked?e.keysToAdd.push(s):e.keysToRemove.push(s),e.render()}),this.params.sortable&&!this.params.freeze){var t=null,i=null;this.$selectedContainer.sortable({start:function(e,i){t=i.item.index()},stop:function(s,n){i=n.item.index(),t!==i&&(c.array.moveEl(e.selectedKeys,t,i),e.render())}})}},n.prototype.render=function(e){var t,i=this;c.array.uniq(this.keysToAdd),c.array.uniq(this.keysToRemove),c.array.subtract(this.keysToAdd,this.selectedKeys),c.array.intersect(this.keysToRemove,this.selectedKeys);for(var n=0;n<this.keysToRemove.length;++n){var r=this.selectedNodes[this.keysToRemove[n]];r&&(r.parentNode.removeChild(r),this.selectedNodes[this.keysToRemove[n]]=null),this.astItems[this.keysToRemove[n]].node.getElementsByTagName("INPUT")[0].checked=!1}c.array.subtract(this.selectedKeys,this.keysToRemove);for(var a=0;a<this.keysToAdd.length;++a){var o=this.keysToAdd[a],l=this.astItems[o];this.selectedKeys.push(o);var d=c.dom.createSelected(l,this.params.freeze,this.params.showSectionOnSelected);this.selectedNodes[l.id]=d,this.$selectedContainer.append(d);var h=l.node.getElementsByTagName("INPUT")[0];h&&(h.checked=!0)}(t=this.selectedKeys).push.apply(t,s(this.keysToAdd)),c.array.uniq(this.selectedKeys),this.redrawSectionCheckboxes();for(var u={},p={},f=0;f<this.selectedKeys.length;++f){var v=this.astItems[this.selectedKeys[f]].value;u[this.selectedKeys[f]]=!0,p[v]=f}var y=this.$originalSelect.find("option").toArray();if(y.sort(function(e,t){return(p[e.value]||0)-(p[t.value]||0)}),this.$originalSelect.html(y),this.$originalSelect.find("option").each(function(e,t){this.selected=!!u[c.getKey(t)]}),this.$originalSelect.change(),!e&&this.params.onChange){var m=this.selectedKeys.map(function(e){return i.astItems[e]}),k=this.keysToAdd.map(function(e){return i.astItems[e]}),x=this.keysToRemove.map(function(e){return i.astItems[e]});this.params.onChange(m,k,x)}this.keysToRemove=[],this.keysToAdd=[]},t.exports=n},{"./ast":1,"./search":3,"./ui-builder":6,"./utility":9}],6:[function(e,t,i){"use strict";function s(e,t){var i=jQuery('<div class="tree-multiselect"></div>'),s=jQuery('<div class="selections"></div>');t&&s.addClass("no-border"),i.append(s);var n=jQuery('<div class="selected"></div>');t||i.append(n),this.$el=e,this.$treeContainer=i,this.$selectionContainer=s,this.$selectedContainer=n}s.prototype.attach=function(){this.$el.after(this.$treeContainer)},s.prototype.remove=function(){this.$treeContainer.remove()},t.exports=s},{}],7:[function(e,t,i){"use strict";function s(e,t){for(var i=0,s=0;s<e.length;++s)t(e[s])&&(e[i]=e[s],++i);e.length=i}i.flatten=function(e,t){if(!Array.isArray(e))return e;t=t||[];for(var s=0;s<e.length;++s)Array.isArray(e[s])?t.concat(i.flatten(e[s],t)):t.push(e[s]);return t},i.uniq=function(e){var t={};s(e,function(e){var i=!t[e];return t[e]=!0,i})},i.removeFalseyExceptZero=function(e){s(e,function(e){return e||0===e})},i.moveEl=function(e,t,i){var s=e[t];e.splice(t,1),e.splice(i,0,s)},i.subtract=function(e,t){for(var i={},n=0;n<t.length;++n)i[t[n]]=!0;s(e,function(e){return!i[e]})},i.intersect=function(e,t){for(var i={},n=0;n<t.length;++n)i[t[n]]=!0;s(e,function(e){return i[e]})},i.intersectMany=function(e){var t=[],i=[];e.forEach(function(e){t.push(0),i.push(e.length-1)});for(var s=[];t.length>0&&t[0]<=i[0];++t[0]){for(var n=!1,r=1;r<e.length;++r){for(;e[r][t[r]]<e[0][t[0]]&&t[r]<=i[r];)++t[r];if(t[r]>i[r]){n=!0;break}}if(n)break;for(var a=!0,o=1;o<e.length;++o)if(e[0][t[0]]!==e[o][t[o]]){a=!1;break}a&&s.push(e[0][t[0]])}return s}},{}],8:[function(e,t,i){"use strict";i.createNode=function(e,t){var i=document.createElement(e);if(t){for(var s in t)t.hasOwnProperty(s)&&"text"!==s&&i.setAttribute(s,t[s]);t.text&&(i.textContent=t.text)}return i},i.createSelection=function(e,t,s){var n={class:"item","data-key":e.id,"data-value":e.value},r=!!e.description;r&&(n["data-description"]=e.description),e.initialIndex&&(n["data-index"]=e.initialIndex);var a=i.createNode("div",n);if(r){var o=i.createNode("span",{class:"description",text:"?"});a.appendChild(o)}if(t){var c="treemultiselect-"+e.treeId+"-"+e.id,l={class:"option",type:"checkbox",id:c};(s||e.disabled)&&(l.disabled=!0);var d=i.createNode("input",l);a.insertBefore(d,a.firstChild);var h={class:e.disabled?"disabled":"",for:c,text:e.text||e.value},u=i.createNode("label",h);a.appendChild(u)}else a.innerText=e.text||e.value;return a},i.createSelected=function(e,t,s){var n=i.createNode("div",{class:"item","data-key":e.id,"data-value":e.value,text:e.text});if(!t&&!e.disabled){var r=i.createNode("span",{class:"remove-selected",text:"×"});n.insertBefore(r,n.firstChild)}if(s){var a=i.createNode("span",{class:"section-name",text:e.section});n.appendChild(a)}return n},i.createSection=function(e,t,s){var n=i.createNode("div",{class:"section","data-key":e.id}),r=i.createNode("div",{class:"title",text:e.name});if(t){var a={class:"section",type:"checkbox"};s&&(a.disabled=!0);var o=i.createNode("input",a);r.insertBefore(o,r.firstChild)}return n.appendChild(r),n}},{}],9:[function(e,t,i){"use strict";i.array=e("./array"),i.assert=function(e,t){if(!e)throw new Error(t||"Assertion failed")},i.dom=e("./dom"),i.getKey=function(e){return i.assert(e),parseInt(e.getAttribute("data-key"))}},{"./array":7,"./dom":8}]},{},[4]);
\ No newline at end of file
+/* jQuery Tree Multiselect v2.5.1 | (c) Patrick Tsai | MIT Licensed */
+!function e(t,i,s){function n(a,o){if(!i[a]){if(!t[a]){var c="function"==typeof require&&require;if(!o&&c)return c(a,!0);if(r)return r(a,!0);var l=new Error("Cannot find module '"+a+"'");throw l.code="MODULE_NOT_FOUND",l}var d=i[a]={exports:{}};t[a][0].call(d.exports,function(e){var i=t[a][1][e];return n(i||e)},d,d.exports,e,t,i,s)}return i[a].exports}for(var r="function"==typeof require&&require,a=0;a<s.length;a++)n(s[a]);return n}({1:[function(e,t,i){"use strict";jQuery.fn.treeMultiselect=e("./tree-multiselect/main")},{"./tree-multiselect/main":5}],2:[function(e,t,i){"use strict";var s=e("./item"),n=e("./section");i.createLookup=function(e){return{arr:e,children:{}}},i.createSection=function(e){return new n(e)},i.createItem=function(e){return new s(e)}},{"./item":3,"./section":4}],3:[function(e,t,i){"use strict";function s(e){e=e||{},this.treeId=e.treeId,this.id=e.id,this.value=e.value,this.text=e.text,this.description=e.description,this.initialIndex=e.initialIndex?parseInt(e.initialIndex):null,this.section=e.section,this.disabled=e.disabled,this.selected=e.selected,this.node=null}var n=e("../utility");s.prototype.isSection=function(){return!1},s.prototype.isItem=function(){return!0},s.prototype.render=function(e,t){return this.node||(this.node=n.dom.createSelection(this,e,t)),this.node},t.exports=s},{"../utility":11}],4:[function(e,t,i){"use strict";function s(e){e=e||{},this.treeId=e.treeId,this.id=e.id,this.name=e.name,this.items=[],this.node=null}var n=e("../utility");s.prototype.isSection=function(){return!0},s.prototype.isItem=function(){return!1},s.prototype.render=function(e,t){return this.node||(this.node=n.dom.createSection(this,e,t)),this.node},t.exports=s},{"../utility":11}],5:[function(e,t,i){"use strict";function s(e){var t={allowBatchSelection:!0,collapsible:!0,enableSelectAll:!1,selectAllText:"Select All",unselectAllText:"Unselect All",freeze:!1,hideSidePanel:!1,maxSelections:0,onChange:null,onlyBatchSelection:!1,searchable:!1,searchParams:["value","text","description","section"],sectionDelimiter:"/",showSectionOnSelected:!0,sortable:!1,startCollapsed:!1};return jQuery.extend({},t,e)}var n=e("./tree"),r=0;t.exports=function(e){var t=this,i=s(e);return this.map(function(){var e=t;e.attr("multiple","").css("display","none");var s=new n(r,e,i);return s.initialize(),++r,{reload:function(){s.reload()},remove:function(){s.remove()}}})}},{"./tree":7}],6:[function(e,t,i){"use strict";function s(e,t,i){this.index={},this.astItems=e,this.astItemKeys=Object.keys(e),this.astSections=t,this.astSectionKeys=Object.keys(t),this.setSearchParams(i),this.buildIndex()}function n(e){if(r.assert(e),e.length<a)return[e];for(var t=[],i=0;i<e.length-a+1;++i)t.push(e.substring(i,i+a));return t}var r=e("./utility"),a=3;s.prototype.setSearchParams=function(e){r.assert(Array.isArray(e));var t={value:!0,text:!0,description:!0,section:!0};this.searchParams=[];for(var i=0;i<e.length;++i)t[e[i]]&&this.searchParams.push(e[i])},s.prototype.buildIndex=function(){var e=this;for(var t in this.astItems)!function(t){var i=e.astItems[t],s=[];e.searchParams.forEach(function(e){s.push(i[e])}),r.array.removeFalseyExceptZero(s),s.map(function(e){return e.toLowerCase()}).forEach(function(t){t.split(" ").forEach(function(t){e._addToIndex(t,i.id)})})}(t)},s.prototype._addToIndex=function(e,t){for(var i=1;i<=a;++i)for(var s=0;s<e.length-i+1;++s){var n=e.substring(s,s+i);this.index[n]||(this.index[n]=[]);var r=this.index[n].length;0!==r&&this.index[n][r-1]===t||this.index[n].push(t)}},s.prototype.search=function(e){var t=this;if(!e)return this.astItemKeys.forEach(function(e){t.astItems[e].node.style.display=""}),void this.astSectionKeys.forEach(function(e){t.astSections[e].node.style.display="",t.astSections[e].node.removeAttribute("searchhit")});var i=[];(e=e.toLowerCase()).split(" ").forEach(function(e){n(e).forEach(function(e){i.push(t.index[e]||[])})});var s=r.array.intersectMany(i);this._handleNodeVisbilities(s)},s.prototype._handleNodeVisbilities=function(e){var t=this,i={},s={};e.forEach(function(e){i[e]=!0;var n=t.astItems[e].node;for(n.style.display="",n=n.parentNode;!n.className.match(/tree-multiselect/);){if(n.className.match(/section/)){var a=r.getKey(n);if(r.assert(a||0===a),s[a])break;s[a]=!0,n.style.display="",n.setAttribute("searchhit",!0)}n=n.parentNode}}),this.astItemKeys.forEach(function(e){i[e]||(t.astItems[e].node.style.display="none")}),this.astSectionKeys.forEach(function(e){s[e]||(t.astSections[e].node.style.display="none")})},t.exports=s},{"./utility":11}],7:[function(e,t,i){"use strict";function s(e){if(Array.isArray(e)){for(var t=0,i=Array(e.length);t<e.length;t++)i[t]=e[t];return i}return Array.from(e)}function n(e,t,i){this.id=e,this.$originalSelect=t,this.params=i,this.resetState()}var r=e("./ast"),a=e("./search"),o=e("./ui-builder"),c=e("./utility");n.prototype.initialize=function(){if(this.generateSelections(this.$selectionContainer[0]),this.popupDescriptionHover(),this.params.allowBatchSelection&&this.handleSectionCheckboxMarkings(),this.params.collapsible&&this.addCollapsibility(),this.params.searchable||this.params.enableSelectAll){var e=c.dom.createNode("div",{class:"auxiliary"});this.$selectionContainer.prepend(e,this.$selectionContainer.firstChild),this.params.searchable&&this.createSearchBar(e),this.params.enableSelectAll&&this.createSelectAllButtons(e)}this.armRemoveSelectedOnClick(),this.updateSelectedAndOnChange(),this.render(!0),this.uiBuilder.attach()},n.prototype.remove=function(){this.uiBuilder.remove(),this.resetState()},n.prototype.reload=function(){this.remove(),this.initialize()},n.prototype.resetState=function(){this.uiBuilder=new o(this.$originalSelect,this.params.hideSidePanel),this.$treeContainer=this.uiBuilder.$treeContainer,this.$selectionContainer=this.uiBuilder.$selectionContainer,this.$selectedContainer=this.uiBuilder.$selectedContainer,this.astItems={},this.astSections={},this.selectedNodes={},this.selectedKeys=[],this.keysToAdd=[],this.keysToRemove=[]},n.prototype.generateSelections=function(e){var t=this.$originalSelect.children("option"),i=this.createAst(t);this.generateHtml(i,e)},n.prototype.createAst=function(e){var t,i=[],s=r.createLookup(i),n=this,a=0,o=0,l=[],d=[];return e.each(function(){var e=this;e.setAttribute("data-key",a);var t=r.createItem({treeId:n.id,id:a,value:e.value,text:e.text,description:e.getAttribute("data-description"),initialIndex:e.getAttribute("data-index"),section:e.getAttribute("data-section"),disabled:e.hasAttribute("readonly"),selected:e.hasAttribute("selected")});t.initialIndex&&t.selected?(l[t.initialIndex]=l[t.initialIndex]||[],l[t.initialIndex].push(a)):t.selected&&d.push(a),n.astItems[a]=t,++a;for(var i=s,c=t.section,h=c&&c.length>0?c.split(n.params.sectionDelimiter):[],u=0;u<h.length;++u){var p=h[u];if(i.children[p])i=i.children[p];else{var f=r.createSection({treeId:n.id,id:o,name:p});++o,i.arr.push(f);var y=r.createLookup(f.items);i.children[p]=y,i=y}}i.arr.push(t)}),this.keysToAdd=c.array.flatten(l),c.array.removeFalseyExceptZero(this.keysToAdd),(t=this.keysToAdd).push.apply(t,d),c.array.uniq(this.keysToAdd),i},n.prototype.generateHtml=function(e,t){for(var i=0;i<e.length;++i){var s=e[i];if(s.isSection()){this.astSections[s.id]=s;var n=this.params.allowBatchSelection,r=this.params.freeze,a=s.render(n,r);t.appendChild(a),this.generateHtml(s.items,a)}else if(s.isItem()){this.astItems[s.id]=s;var o=!this.params.onlyBatchSelection,c=this.params.freeze,l=s.render(o,c);t.appendChild(l)}}},n.prototype.popupDescriptionHover=function(){this.$selectionContainer.on("mouseenter","div.item > span.description",function(){var e=jQuery(this).parent(),t=e.attr("data-description"),i=document.createElement("div");i.className="temp-description-popup",i.innerHTML=t,i.style.position="absolute",e.append(i)}),this.$selectionContainer.on("mouseleave","div.item > span.description",function(){jQuery(this).parent().find("div.temp-description-popup").remove()})},n.prototype.handleSectionCheckboxMarkings=function(){var e=this;this.$selectionContainer.on("click","input.section[type=checkbox]",function(){var t=jQuery(this).closest("div.section").find("div.item").map(function(t,i){var s=c.getKey(i);if(!e.astItems[s].disabled)return s}).get();if(this.checked){var i;(i=e.keysToAdd).push.apply(i,s(t)),c.array.uniq(e.keysToAdd)}else{var n;(n=e.keysToRemove).push.apply(n,s(t)),c.array.uniq(e.keysToRemove)}e.render()})},n.prototype.redrawSectionCheckboxes=function(e){var t=3,i=this;if((e=e||this.$selectionContainer).find("> div.section").each(function(){var e=i.redrawSectionCheckboxes(jQuery(this));t&=e}),t)for(var s=e.find("> div.item > input[type=checkbox]"),n=0;n<s.length&&(s[n].disabled||(s[n].checked?t&=-3:t&=-2),0!==t);++n);var r=e.find("> div.title > input[type=checkbox]");return r.length&&(r=r[0],1&t?(r.checked=!0,r.indeterminate=!1):2&t?(r.checked=!1,r.indeterminate=!1):(r.checked=!1,r.indeterminate=!0)),t},n.prototype.addCollapsibility=function(){var e=this.$selectionContainer.find("div.title"),t=c.dom.createNode("span",{class:"collapse-section"});e.prepend(t);var i=this.$selectionContainer.find("div.section");this.params.startCollapsed&&i.addClass("collapsed"),this.$selectionContainer.on("click","div.title",function(e){"INPUT"!==e.target.nodeName&&(jQuery(this).parent().toggleClass("collapsed"),e.stopPropagation())})},n.prototype.createSearchBar=function(e){var t=new a(this.astItems,this.astSections,this.params.searchParams),i=c.dom.createNode("input",{class:"search",placeholder:"Search..."});e.appendChild(i),this.$selectionContainer.on("input","input.search",function(){var e=this.value;t.search(e)})},n.prototype.createSelectAllButtons=function(e){var t=c.dom.createNode("span",{class:"select-all",text:this.params.selectAllText}),i=c.dom.createNode("span",{class:"unselect-all",text:this.params.unselectAllText}),n=c.dom.createNode("div",{class:"select-all-container"});n.appendChild(t),n.appendChild(i),e.appendChild(n);var r=this;this.$selectionContainer.on("click","span.select-all",function(){r.keysToAdd=Object.keys(r.astItems),r.render()}),this.$selectionContainer.on("click","span.unselect-all",function(){var e;(e=r.keysToRemove).push.apply(e,s(r.selectedKeys)),r.render()})},n.prototype.armRemoveSelectedOnClick=function(){var e=this;this.$selectedContainer.on("click","span.remove-selected",function(){var t=this.parentNode,i=c.getKey(t);e.keysToRemove.push(i),e.render()})},n.prototype.updateSelectedAndOnChange=function(){var e=this;if(this.$selectionContainer.on("click","input.option[type=checkbox]",function(){var t=this,i=t.parentNode,s=c.getKey(i);c.assert(s||0===s),t.checked?e.keysToAdd.push(s):e.keysToRemove.push(s),e.render()}),this.params.sortable&&!this.params.freeze){var t=null,i=null;this.$selectedContainer.sortable({start:function(e,i){t=i.item.index()},stop:function(s,n){i=n.item.index(),t!==i&&(c.array.moveEl(e.selectedKeys,t,i),e.render())}})}},n.prototype.render=function(e){var t,i=this;if(c.array.uniq(this.keysToAdd),c.array.uniq(this.keysToRemove),c.array.subtract(this.keysToAdd,this.selectedKeys),c.array.intersect(this.keysToRemove,this.selectedKeys),c.isInteger(this.params.maxSelections)&&this.params.maxSelections>0){var n=this.keysToAdd.length-this.keysToRemove.length+this.selectedKeys.length;if(n>this.params.maxSelections){var r,a=n-this.params.maxSelections,o=[];a>this.selectedKeys.length?(o.push.apply(o,s(this.selectedKeys)),a-=this.selectedKeys.length,o.push.apply(o,s(this.keysToAdd.splice(0,a)))):o.push.apply(o,s(this.selectedKeys.slice(0,a))),(r=this.keysToRemove).push.apply(r,o)}}for(var l=0;l<this.keysToRemove.length;++l){var d=this.selectedNodes[this.keysToRemove[l]];d&&(d.parentNode.removeChild(d),this.selectedNodes[this.keysToRemove[l]]=null),this.astItems[this.keysToRemove[l]].node.getElementsByTagName("INPUT")[0].checked=!1}c.array.subtract(this.selectedKeys,this.keysToRemove);for(var h=0;h<this.keysToAdd.length;++h){var u=this.keysToAdd[h],p=this.astItems[u];this.selectedKeys.push(u);var f=c.dom.createSelected(p,this.params.freeze,this.params.showSectionOnSelected);this.selectedNodes[p.id]=f,this.$selectedContainer.append(f);var y=p.node.getElementsByTagName("INPUT")[0];y&&(y.checked=!0)}(t=this.selectedKeys).push.apply(t,s(this.keysToAdd)),c.array.uniq(this.selectedKeys),this.redrawSectionCheckboxes();for(var v={},m={},x=0;x<this.selectedKeys.length;++x){var k=this.astItems[this.selectedKeys[x]].value;v[this.selectedKeys[x]]=!0,m[k]=x}var g=this.$originalSelect.find("option").toArray();if(g.sort(function(e,t){return(m[e.value]||0)-(m[t.value]||0)}),this.$originalSelect.html(g),this.$originalSelect.find("option").each(function(e,t){this.selected=!!v[c.getKey(t)]}),this.$originalSelect.change(),!e&&this.params.onChange){var S=this.selectedKeys.map(function(e){return i.astItems[e]}),b=this.keysToAdd.map(function(e){return i.astItems[e]}),C=this.keysToRemove.map(function(e){return i.astItems[e]});this.params.onChange(S,b,C)}this.keysToRemove=[],this.keysToAdd=[]},t.exports=n},{"./ast":2,"./search":6,"./ui-builder":8,"./utility":11}],8:[function(e,t,i){"use strict";function s(e,t){var i=jQuery('<div class="tree-multiselect"></div>'),s=jQuery('<div class="selections"></div>');t&&s.addClass("no-border"),i.append(s);var n=jQuery('<div class="selected"></div>');t||i.append(n),this.$el=e,this.$treeContainer=i,this.$selectionContainer=s,this.$selectedContainer=n}s.prototype.attach=function(){this.$el.after(this.$treeContainer)},s.prototype.remove=function(){this.$treeContainer.remove()},t.exports=s},{}],9:[function(e,t,i){"use strict";function s(e,t){for(var i=0,s=0;s<e.length;++s)t(e[s])&&(e[i]=e[s],++i);e.length=i}i.flatten=function(e,t){if(!Array.isArray(e))return e;t=t||[];for(var s=0;s<e.length;++s)Array.isArray(e[s])?t.concat(i.flatten(e[s],t)):t.push(e[s]);return t},i.uniq=function(e){var t={};s(e,function(e){var i=!t[e];return t[e]=!0,i})},i.removeFalseyExceptZero=function(e){s(e,function(e){return e||0===e})},i.moveEl=function(e,t,i){var s=e[t];e.splice(t,1),e.splice(i,0,s)},i.subtract=function(e,t){for(var i={},n=0;n<t.length;++n)i[t[n]]=!0;s(e,function(e){return!i[e]})},i.intersect=function(e,t){for(var i={},n=0;n<t.length;++n)i[t[n]]=!0;s(e,function(e){return i[e]})},i.intersectMany=function(e){var t=[],i=[];e.forEach(function(e){t.push(0),i.push(e.length-1)});for(var s=[];t.length>0&&t[0]<=i[0];++t[0]){for(var n=!1,r=1;r<e.length;++r){for(;e[r][t[r]]<e[0][t[0]]&&t[r]<=i[r];)++t[r];if(t[r]>i[r]){n=!0;break}}if(n)break;for(var a=!0,o=1;o<e.length;++o)if(e[0][t[0]]!==e[o][t[o]]){a=!1;break}a&&s.push(e[0][t[0]])}return s}},{}],10:[function(e,t,i){"use strict";i.createNode=function(e,t){var i=document.createElement(e);if(t){for(var s in t)t.hasOwnProperty(s)&&"text"!==s&&i.setAttribute(s,t[s]);t.text&&(i.textContent=t.text)}return i},i.createSelection=function(e,t,s){var n={class:"item","data-key":e.id,"data-value":e.value},r=!!e.description;r&&(n["data-description"]=e.description),e.initialIndex&&(n["data-index"]=e.initialIndex);var a=i.createNode("div",n);if(r){var o=i.createNode("span",{class:"description",text:"?"});a.appendChild(o)}if(t){var c="treemultiselect-"+e.treeId+"-"+e.id,l={class:"option",type:"checkbox",id:c};(s||e.disabled)&&(l.disabled=!0);var d=i.createNode("input",l);a.insertBefore(d,a.firstChild);var h={class:e.disabled?"disabled":"",for:c,text:e.text||e.value},u=i.createNode("label",h);a.appendChild(u)}else a.innerText=e.text||e.value;return a},i.createSelected=function(e,t,s){var n=i.createNode("div",{class:"item","data-key":e.id,"data-value":e.value,text:e.text});if(!t&&!e.disabled){var r=i.createNode("span",{class:"remove-selected",text:"×"});n.insertBefore(r,n.firstChild)}if(s){var a=i.createNode("span",{class:"section-name",text:e.section});n.appendChild(a)}return n},i.createSection=function(e,t,s){var n=i.createNode("div",{class:"section","data-key":e.id}),r=i.createNode("div",{class:"title",text:e.name});if(t){var a={class:"section",type:"checkbox"};s&&(a.disabled=!0);var o=i.createNode("input",a);r.insertBefore(o,r.firstChild)}return n.appendChild(r),n}},{}],11:[function(e,t,i){"use strict";i.array=e("./array"),i.assert=function(e,t){if(!e)throw new Error(t||"Assertion failed")},i.dom=e("./dom"),i.getKey=function(e){return i.assert(e),parseInt(e.getAttribute("data-key"))},i.isInteger=function(e){var t;return!isNaN(e)&&(0|(t=parseFloat(e)))===t}},{"./array":9,"./dom":10}]},{},[1]);
\ No newline at end of file
diff --git a/package.json b/package.json
index 8555be4..15af6ad 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "tree-multiselect",
-  "version": "2.5.0",
+  "version": "2.5.1",
   "description": "jQuery multiple select with nested options",
   "browser": "dist/jquery.tree-multiselect.min.js",
   "keywords": [
diff --git a/src/style.scss b/sass/style.scss
similarity index 100%
rename from src/style.scss
rename to sass/style.scss
diff --git a/src/ast.js b/src/ast.js
deleted file mode 100644
index 52b12e2..0000000
--- a/src/ast.js
+++ /dev/null
@@ -1,73 +0,0 @@
-const Util = require('./utility');
-
-function Section(obj) {
-  obj = obj || {};
-
-  this.treeId = obj.treeId;
-  this.id = obj.id;
-  this.name = obj.name;
-  this.items = [];
-
-  this.node = null;
-}
-
-Section.prototype.isSection = function() {
-  return true;
-};
-
-Section.prototype.isItem = function() {
-  return false;
-};
-
-Section.prototype.render = function(createCheckboxes, disableCheckboxes) {
-  if (!this.node) {
-    this.node = Util.dom.createSection(this, createCheckboxes, disableCheckboxes);
-  }
-  return this.node;
-};
-
-function Item(obj) {
-  obj = obj || {};
-
-  this.treeId = obj.treeId;
-  this.id = obj.id;
-  this.value = obj.value;
-  this.text = obj.text;
-  this.description = obj.description;
-  this.initialIndex = obj.initialIndex ? parseInt(obj.initialIndex) : null;
-  this.section = obj.section;
-  this.disabled = obj.disabled;
-  this.selected = obj.selected;
-
-  this.node = null;
-}
-
-Item.prototype.isSection = function() {
-  return false;
-};
-
-Item.prototype.isItem = function() {
-  return true;
-};
-
-Item.prototype.render = function(createCheckboxes, disableCheckboxes) {
-  if (!this.node) {
-    this.node = Util.dom.createSelection(this, createCheckboxes, disableCheckboxes);
-  }
-  return this.node;
-};
-
-exports.createLookup = function(arr) {
-  return {
-    arr: arr,
-    children: {}
-  };
-};
-
-exports.createSection = function(obj) {
-  return new Section(obj);
-};
-
-exports.createItem = function(obj) {
-  return new Item(obj);
-};
diff --git a/src/tree-multiselect.js b/src/tree-multiselect.js
index 61362a0..33bc13f 100644
--- a/src/tree-multiselect.js
+++ b/src/tree-multiselect.js
@@ -1,4 +1,4 @@
 (($) => {
   'use strict';
-  $.fn.treeMultiselect = require('./main');
+  $.fn.treeMultiselect = require('./tree-multiselect/main');
 })(jQuery);
diff --git a/src/tree-multiselect/ast/index.js b/src/tree-multiselect/ast/index.js
new file mode 100644
index 0000000..eadbd4c
--- /dev/null
+++ b/src/tree-multiselect/ast/index.js
@@ -0,0 +1,17 @@
+const Item = require('./item');
+const Section = require('./section');
+
+exports.createLookup = function(arr) {
+  return {
+    arr: arr,
+    children: {}
+  };
+};
+
+exports.createSection = function(obj) {
+  return new Section(obj);
+};
+
+exports.createItem = function(obj) {
+  return new Item(obj);
+};
diff --git a/src/tree-multiselect/ast/item.js b/src/tree-multiselect/ast/item.js
new file mode 100644
index 0000000..1b2be96
--- /dev/null
+++ b/src/tree-multiselect/ast/item.js
@@ -0,0 +1,34 @@
+const Util = require('../utility');
+
+function Item(obj) {
+  obj = obj || {};
+
+  this.treeId = obj.treeId;
+  this.id = obj.id;
+  this.value = obj.value;
+  this.text = obj.text;
+  this.description = obj.description;
+  this.initialIndex = obj.initialIndex ? parseInt(obj.initialIndex) : null;
+  this.section = obj.section;
+  this.disabled = obj.disabled;
+  this.selected = obj.selected;
+
+  this.node = null;
+}
+
+Item.prototype.isSection = function() {
+  return false;
+};
+
+Item.prototype.isItem = function() {
+  return true;
+};
+
+Item.prototype.render = function(createCheckboxes, disableCheckboxes) {
+  if (!this.node) {
+    this.node = Util.dom.createSelection(this, createCheckboxes, disableCheckboxes);
+  }
+  return this.node;
+};
+
+module.exports = Item;
diff --git a/src/tree-multiselect/ast/section.js b/src/tree-multiselect/ast/section.js
new file mode 100644
index 0000000..e21b655
--- /dev/null
+++ b/src/tree-multiselect/ast/section.js
@@ -0,0 +1,29 @@
+const Util = require('../utility');
+
+function Section(obj) {
+  obj = obj || {};
+
+  this.treeId = obj.treeId;
+  this.id = obj.id;
+  this.name = obj.name;
+  this.items = [];
+
+  this.node = null;
+}
+
+Section.prototype.isSection = function() {
+  return true;
+};
+
+Section.prototype.isItem = function() {
+  return false;
+};
+
+Section.prototype.render = function(createCheckboxes, disableCheckboxes) {
+  if (!this.node) {
+    this.node = Util.dom.createSection(this, createCheckboxes, disableCheckboxes);
+  }
+  return this.node;
+};
+
+module.exports = Section;
diff --git a/src/main.js b/src/tree-multiselect/main.js
similarity index 98%
rename from src/main.js
rename to src/tree-multiselect/main.js
index ad525d7..1858279 100644
--- a/src/main.js
+++ b/src/tree-multiselect/main.js
@@ -35,6 +35,7 @@ function mergeDefaultOptions(options) {
     unselectAllText: 'Unselect All',
     freeze: false,
     hideSidePanel: false,
+    maxSelections: 0,
     onChange: null,
     onlyBatchSelection: false,
     searchable: false,
diff --git a/src/search.js b/src/tree-multiselect/search.js
similarity index 100%
rename from src/search.js
rename to src/tree-multiselect/search.js
diff --git a/src/tree.js b/src/tree-multiselect/tree.js
similarity index 94%
rename from src/tree.js
rename to src/tree-multiselect/tree.js
index e0f7509..d9cd6c2 100644
--- a/src/tree.js
+++ b/src/tree-multiselect/tree.js
@@ -373,6 +373,23 @@ Tree.prototype.render = function(noCallbacks) {
   Util.array.subtract(this.keysToAdd, this.selectedKeys);
   Util.array.intersect(this.keysToRemove, this.selectedKeys);
 
+  // check for max number of selections
+  if (Util.isInteger(this.params.maxSelections) && this.params.maxSelections > 0) {
+    const currentLength = this.keysToAdd.length - this.keysToRemove.length + this.selectedKeys.length;
+    if (currentLength > this.params.maxSelections) {
+      let lengthToCut = currentLength - this.params.maxSelections;
+      let keysToCut = [];
+      if (lengthToCut > this.selectedKeys.length) {
+        keysToCut.push(...this.selectedKeys);
+        lengthToCut -= this.selectedKeys.length;
+        keysToCut.push(...(this.keysToAdd.splice(0, lengthToCut)));
+      } else {
+        keysToCut.push(...this.selectedKeys.slice(0, lengthToCut));
+      }
+      this.keysToRemove.push(...keysToCut);
+    }
+  }
+
   // remove items first
   for (let ii = 0; ii < this.keysToRemove.length; ++ii) {
     // remove the selected divs
@@ -424,6 +441,8 @@ Tree.prototype.render = function(noCallbacks) {
     valHash[value] = kk;
   }
   // TODO is there a better way to sort the values other than by HTML?
+  // NOTE: the following does not work since jQuery duplicates option values with the same value
+  // this.$originalSelect.val(vals);
   let options = this.$originalSelect.find('option').toArray();
   options.sort(function(a, b) {
     let aValue = valHash[a.value] || 0;
@@ -435,8 +454,6 @@ Tree.prototype.render = function(noCallbacks) {
   this.$originalSelect.find('option').each(function(idx, el) {
     this.selected = !!originalValsHash[Util.getKey(el)];
   });
-  // NOTE: the following does not work since jQuery duplicates option values with the same value
-  //this.$originalSelect.val(vals).change();
   this.$originalSelect.change();
 
   if (!noCallbacks && this.params.onChange) {
diff --git a/src/ui-builder.js b/src/tree-multiselect/ui-builder.js
similarity index 100%
rename from src/ui-builder.js
rename to src/tree-multiselect/ui-builder.js
diff --git a/src/utility/array.js b/src/tree-multiselect/utility/array.js
similarity index 100%
rename from src/utility/array.js
rename to src/tree-multiselect/utility/array.js
diff --git a/src/utility/dom.js b/src/tree-multiselect/utility/dom.js
similarity index 100%
rename from src/utility/dom.js
rename to src/tree-multiselect/utility/dom.js
diff --git a/src/utility/index.js b/src/tree-multiselect/utility/index.js
similarity index 67%
rename from src/utility/index.js
rename to src/tree-multiselect/utility/index.js
index 1955dbd..8105466 100644
--- a/src/utility/index.js
+++ b/src/tree-multiselect/utility/index.js
@@ -12,3 +12,12 @@ exports.getKey = function(el) {
   exports.assert(el);
   return parseInt(el.getAttribute('data-key'));
 };
+
+exports.isInteger = function(value) {
+  var x;
+  if (isNaN(value)) {
+    return false;
+  }
+  x = parseFloat(value);
+  return (x | 0) === x;
+};
diff --git a/test/integration/options.test.js b/test/integration/options.test.js
index af27686..898fa9e 100644
--- a/test/integration/options.test.js
+++ b/test/integration/options.test.js
@@ -427,4 +427,41 @@ describe('Options', () => {
     $selected = Common.selected({value: 'one'});
     assert.equal($selected.length, 1);
   });
+
+  it('can set a maximum number of selections', () => {
+    $("select").append("<option value='one' data-section='test' selected='selected'>One</option>");
+    $("select").append("<option value='two' data-section='test' selected='selected'>Two</option>");
+    $("select").append("<option value='three' data-section='test' selected='selected'>Three</option>");
+    $("select").append("<option value='four' data-section='test' selected='selected'>Four</option>");
+    $("select").treeMultiselect({maxSelections: 2});
+
+    assert.equal(Common.selected().length, 2);
+    assert.deepEqual($("select").val(), ['three', 'four'])
+
+    var $checkbox = Common.selectionCheckbox();
+    $checkbox.first().click();
+
+    assert.equal(Common.selected().length, 2);
+    assert.deepEqual($("select").val(), ['four', 'one'])
+  })
+
+  it('maximum number of selections doesn\'t work with negative numbers', () => {
+    $("select").append("<option value='one' data-section='test' selected='selected'>One</option>");
+    $("select").append("<option value='two' data-section='test' selected='selected'>Two</option>");
+    $("select").append("<option value='three' data-section='test' selected='selected'>Three</option>");
+    $("select").append("<option value='four' data-section='test' selected='selected'>Four</option>");
+    $("select").treeMultiselect({maxSelections: -1});
+
+    assert.equal(Common.selected().length, 4);
+  })
+
+  it('maximum number of selections doesn\'t work with non-numerical truthy values', () => {
+    $("select").append("<option value='one' data-section='test' selected='selected'>One</option>");
+    $("select").append("<option value='two' data-section='test' selected='selected'>Two</option>");
+    $("select").append("<option value='three' data-section='test' selected='selected'>Three</option>");
+    $("select").append("<option value='four' data-section='test' selected='selected'>Four</option>");
+    $("select").treeMultiselect({maxSelections: true});
+
+    assert.equal(Common.selected().length, 4);
+  })
 });
diff --git a/test/test.html b/test/test.html
index da2cb5a..1c86617 100644
--- a/test/test.html
+++ b/test/test.html
@@ -76,6 +76,7 @@
       var tree3 = $("#test-select-3").treeMultiselect({
         allowBatchSelection: false,
         enableSelectAll: true,
+        maxSelections: 4,
         searchable: true,
         sortable: true,
         startCollapsed: true
diff --git a/test/unit/utility.test.js b/test/unit/utility.test.js
index 56ec285..606be8a 100644
--- a/test/unit/utility.test.js
+++ b/test/unit/utility.test.js
@@ -174,18 +174,6 @@ describe('Utility', () => {
       assert.isFalse(option.isSection());
     });
 
-    it('can tell that AST item is not a section', () => {
-      var option = Ast.createItem({
-        id: 0,
-        value: 'val',
-        text: 'text',
-        description: 'description'
-      });
-
-      assert(option.isItem());
-      assert.isFalse(option.isSection());
-    });
-
     it('creates selection node with all properties', () => {
       var section = Ast.createSection('name');