diff --git a/CHANGE.md b/CHANGE.md
index ac45b77..27a7eca 100644
--- a/CHANGE.md
+++ b/CHANGE.md
@@ -1,9 +1,13 @@
-version 1.3.1
+version 1.4.0
 =============
-**Date:** 28-Nov-2014
+**Date:** 01-Feb-2015
 
 1. Updated trigger of afterChange event
 2. Set composer minimum stability to stable.
+3. (enh #10): Enhance ability to use checkbox or radio as the first dependent parent.
+4. (enh #14): Code cleanup and restructure for various JS lint changes (using JSHint Code cleanup library).
+5. (enh #15): Implement reusable constructor for extending plugin if needed.
+6. (enh #16): Enhance Select2 dropdowns to show loading indicator.
 
 version 1.3.0
 =============
diff --git a/README.md b/README.md
index 6da49ad..d6e7d2d 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@ A multi level dependent dropdown JQuery plugin that allows nested dependencies.
 select inputs, whose options are derived based on value selected in another input/or a group of inputs. It works both
 with normal select options and select with optgroups as well.
 
-> NOTE: The latest version of the plugin v1.3.1 has been released. Refer the [CHANGE LOG](https://github.com/kartik-v/dependent-dropdown/blob/master/CHANGE.md) for details.
+> NOTE: The latest version of the plugin v1.4.0 has been released. Refer the [CHANGE LOG](https://github.com/kartik-v/dependent-dropdown/blob/master/CHANGE.md) for details.
 
 ## Features
 
diff --git a/bower.json b/bower.json
index 73237b2..d1802b7 100644
--- a/bower.json
+++ b/bower.json
@@ -1,6 +1,6 @@
 {
     "name": "dependent-dropdown",
-    "version": "1.3.1",
+    "version": "1.4.0",
     "homepage": "https://github.com/kartik-v/dependent-dropdown",
     "authors": [
         "Kartik Visweswaran <kartikv2@gmail.com>"
diff --git a/composer.json b/composer.json
index 23b369b..852dbf9 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,7 @@
             "homepage": "http://www.krajee.com/"
         }
     ],
-	"minimum-stability": "stable",
+    "minimum-stability": "stable",
     "autoload": {
         "psr-4": {
             "kartik\\plugins\\depdrop\\": ""
diff --git a/css/dependent-dropdown.css b/css/dependent-dropdown.css
index 283b124..b1e1dd0 100644
--- a/css/dependent-dropdown.css
+++ b/css/dependent-dropdown.css
@@ -1,18 +1,21 @@
 /*!
  * @copyright Copyright &copy; Kartik Visweswaran, Krajee.com, 2014
- * @version 1.3.1
+ * @version 1.4.0
  *
  * Styling for the dependent-dropdown JQuery plugin. 
  * 
  * For more JQuery plugins visit http://plugins.krajee.com
  * For more Yii related demos visit http://demos.krajee.com
  */
-
-.kv-loading {
+.kv-loading, .select2-container.kv-loading .select2-chosen {
     background-image: url('../img/loading.gif');
     background-position: right 30px center;
     background-repeat: no-repeat;
-    z-index: 15000;
     cursor: wait;
     opacity: 0.6;
+}
+
+.select2-container.kv-loading .select2-chosen {
+    background-position: right center;
+    margin-right: 15px!important;
 }
\ No newline at end of file
diff --git a/css/dependent-dropdown.min.css b/css/dependent-dropdown.min.css
index 2a82939..0aea23a 100644
--- a/css/dependent-dropdown.min.css
+++ b/css/dependent-dropdown.min.css
@@ -1,9 +1,9 @@
 /*!
  * @copyright Copyright &copy; Kartik Visweswaran, Krajee.com, 2014
- * @version 1.3.1
- *
- * Styling for the dependent-dropdown JQuery plugin.
+ * @version 1.4.0
  *
+ * Styling for the dependent-dropdown JQuery plugin. 
+ * 
  * For more JQuery plugins visit http://plugins.krajee.com
  * For more Yii related demos visit http://demos.krajee.com
- */ .kv-loading{background-image:url('../img/loading.gif');background-position:right 30px center;background-repeat:no-repeat;z-index:15000;cursor:wait;opacity:.6}
\ No newline at end of file
+ */.kv-loading,.select2-container.kv-loading .select2-chosen{background-image:url(../img/loading.gif);background-position:right 30px center;background-repeat:no-repeat;cursor:wait;opacity:.6}.select2-container.kv-loading .select2-chosen{background-position:right center;margin-right:15px!important}
\ No newline at end of file
diff --git a/js/dependent-dropdown.js b/js/dependent-dropdown.js
index bcaf68d..d067e18 100644
--- a/js/dependent-dropdown.js
+++ b/js/dependent-dropdown.js
@@ -1,6 +1,6 @@
 /*!
  * @copyright &copy; Kartik Visweswaran, Krajee.com, 2014
- * @version 1.3.1
+ * @version 1.4.0
  *
  * A multi level dependent dropdown JQuery plugin. The plugin
  * allows nested and combined dependencies.
@@ -9,132 +9,127 @@
  * For more Yii related demos visit http://demos.krajee.com
  */
 (function ($) {
+    "use strict";
     var isEmpty = function (value, trim) {
-        return typeof value === 'undefined' || value === null || value === undefined || value == []
-            || value === '' || trim && $.trim(value) === '';
-    };
-    var addOption = function ($el, id, name, sel) {
-        var settings = (id == sel && sel !== null) ? {value: id, text: name, selected: "selected"} : {value: id, text: name};
-        $("<option/>", settings).appendTo($el);
-    };
-    var getSelect = function (data, placeholder, defVal) {
-        var $select = $("<select>");
-        if (placeholder !== false) {
-            addOption($select, "", placeholder, defVal);
-        }
-        $.each(data, function (i, groups) {
-            if (groups.id) {
-                addOption($select, groups.id, groups.name, defVal);
-            }
-            else {
-                var $group = $('<optgroup>', {label: i});
-                $.each(groups, function (j, option) {
-                    addOption($group, option.id, option.name, defVal);
-                });
-                $group.appendTo($select);
-            }
-        });
-        return $select.html();
-    };
-    var getSettings = function ($element, vUrl, vId, vVal, vPlaceholder, vLoading, vLoadingClass, vLoadingText, vEmptyMsg, vInitVal, vCallback, vParams) {
-        var $el = $element, url = vUrl, id = vId, val = vVal, placeholder = vPlaceholder, optCount = 0, emptyMsg = vEmptyMsg,
-            initVal = vInitVal, callBack = vCallback, ajaxData = {depdrop_parents: val};
-        if (!isEmpty(vParams)) {
-            var params = {};
-            for (var i = 0; i < vParams.length; i++) {
-                params[i] = $('#' + vParams[i]).val();
+            return value === null || value === undefined || value.length === 0 || (trim && $.trim(value) === '');
+        },
+        addOption = function ($el, id, name, sel) {
+            var settings = (id === sel && sel !== null) ? {value: id, text: name, selected: "selected"} : {
+                value: id,
+                text: name
+            };
+            $("<option/>", settings).appendTo($el);
+        },
+        getSelect = function (data, placeholder, defVal) {
+            var $select = $("<select>");
+            if (placeholder !== false) {
+                addOption($select, "", placeholder, defVal);
             }
-            ajaxData = {depdrop_parents: val, depdrop_params: params};
-        }
-        var settings = {
-            url: url,
-            type: 'post',
-            data: ajaxData,
-            dataType: 'json',
-            success: function (data) {
-                var selected = (initVal === false) ? (isEmpty(data.selected) ? null : data.selected) : initVal;
-                if (data == null || data.length === 0) {
-                    addOption($el, '', emptyMsg, '');
+            $.each(data, function (i, groups) {
+                if (groups.id) {
+                    addOption($select, groups.id, groups.name, defVal);
                 }
                 else {
-                    $el.html(getSelect(data.output, placeholder, selected));
-                    if ($el.find('optgroup').length > 0) {
-                        $el.find('option[value=""]').attr('disabled', 'disabled');
+                    var $group = $('<optgroup>', {label: i});
+                    $.each(groups, function (j, option) {
+                        addOption($group, option.id, option.name, defVal);
+                    });
+                    $group.appendTo($select);
+                }
+            });
+            return $select.html();
+        },
+        processDep = function ($el, vUrl, vId, vVal, vDef, vLoad, vLoadCss, vLoadMsg, vNullMsg, vInit, vFunc, vPar) {
+            var selected, optCount = 0, ajaxData = {depdrop_parents: vVal}, params = {}, settings;
+            if (!isEmpty(vPar)) {
+                for (var i = 0; i < vPar.length; i++) {
+                    params[i] = $('#' + vPar[i]).val();
+                }
+                ajaxData = {depdrop_parents: vVal, depdrop_params: params};
+            }
+            settings = {
+                url: vUrl,
+                type: 'post',
+                data: ajaxData,
+                dataType: 'json',
+                success: function (data) {
+                    selected = (vInit === false) ? (isEmpty(data.selected) ? null : data.selected) : vInit;
+                    if (isEmpty(data)) {
+                        addOption($el, '', vNullMsg, '');
                     }
-                    if (data.output.length !== 0) {
-                        $el.val(selected);
-                        $el.removeAttr('disabled');
+                    else {
+                        $el.html(getSelect(data.output, vDef, selected));
+                        if ($el.find('optgroup').length > 0) {
+                            $el.find('option[value=""]').attr('disabled', 'disabled');
+                        }
+                        if (data.output.length !== 0) {
+                            $el.val(selected);
+                            $el.removeAttr('disabled');
+                        }
                     }
+                    optCount = $el.find('option').length;
+                    if ($el.find('option[value=""]').length > 0) {
+                        optCount -= 1;
+                    }
+                    $el.trigger('depdrop.change', [vId, $("#" + vId).val(), optCount, vInit]);
                 }
-                optCount = $el.find('option').length;
-                if ($el.find('option[value=""]').length > 0) {
-                    optCount--;
+            };
+            settings.beforeSend = function () {
+                $el.trigger('depdrop.beforeChange', [vId, $("#" + vId).val(), vInit]);
+                $el.attr('disabled', 'disabled');
+                $el.html('');
+                if (vLoad) {
+                    $el.addClass(vLoadCss);
+                    $el.html('<option id="">' + vLoadMsg + '</option>');
                 }
-                $el.trigger('depdrop.change', [id, $("#" + id).val(), optCount, initVal]);
-            }
-        };
-        settings['beforeSend'] = function () {
-            $el.trigger('depdrop.beforeChange', [id, $("#" + id).val(), initVal]);
-            $el.attr('disabled', 'disabled');
-            $el.html('');
-            if (vLoading) {
-                $el.addClass(vLoadingClass);
-                $el.html('<option id="">' + vLoadingText + '</option>');
+            };
+            settings.error = function () {
+                $el.trigger('depdrop.error', [vId, $("#" + vId).val(), vInit]);
+            };
+            settings.complete = function () {
+                vFunc();
+                if (vLoad) {
+                    $el.removeClass(vLoadCss);
+                }
+                $el.trigger('depdrop.afterChange', [vId, $("#" + vId).val(), vInit]);
+            };
+            $.ajax(settings);
+        },
+        initDep = function (j, depends, preset) {
+            var value = {}, $id, i, initVal = preset[j + 1],
+                $el = $('#' + depends[j + 1]), len = depends.length;
+            for (i = 0; i <= j; i++) {
+                $id = $('#' + depends[i]);
+                value[i] = $id.val();
             }
-        };
-        settings['error'] = function () {
-            $el.trigger('depdrop.error', [id, $("#" + id).val(), initVal]);
-        };
-        settings['complete'] = function () {
-            callBack();
-            if (vLoading) {
-                $el.removeClass(vLoadingClass);
+            if (j < len - 1) {
+                processDep(
+                    $el,
+                    $el.data('url'),
+                    $el.attr('id'),
+                    value,
+                    $el.data('placeholder'),
+                    $el.data('loading'),
+                    $el.data('loadingClass'),
+                    $el.data('loadingText'),
+                    $el.data('emptyMsg'),
+                    initVal,
+                    function () {
+                        initDep(j + 1, depends, preset);
+                    },
+                    $el.data('params')
+                );
             }
-            $el.trigger('depdrop.afterChange', [id, $("#" + id).val(), initVal]);
+        },
+        DepDrop = function (element, options) {
+            var self = this;
+            self.$element = $(element);
+            $.each(options, function (key, value) {
+                self[key] = value;
+            });
+            self.initData();
+            self.init();
         };
-        return settings;
-    };
-    var initDependency = function (j, depends, preset) {
-        var $el = $('#' + depends[j]), value = {}, $id,
-            $elNew = $('#' + depends[j + 1]), len = depends.length;
-        for (i = 0; i <= j; i++) {
-            $id = $('#' + depends[i]);
-            value[i] = $id.val();
-        }
-        var initVal = preset[j + 1];
-        if (j < len - 1) {
-            $.ajax(getSettings($elNew,
-                $elNew.data('url'),
-                $elNew.attr('id'),
-                value,
-                $elNew.data('placeholder'),
-                $elNew.data('loading'),
-                $elNew.data('loadingClass'),
-                $elNew.data('loadingText'),
-                $elNew.data('emptyMsg'),
-                initVal,
-                function () {
-                    initDependency(j + 1, depends, preset);
-                },
-                $elNew.data('params')
-            ));
-        }
-    };
-    // DepDrop public class definition
-    var DepDrop = function (element, options) {
-        this.$element = $(element);
-        this.url = options.url;
-        this.depends = options.depends;
-        this.loading = options.loading;
-        this.loadingClass = options.loadingClass;
-        this.loadingText = options.loadingText;
-        this.placeholder = options.placeholder;
-        this.emptyMsg = options.emptyMsg;
-        this.initialize = options.initialize;
-        this.params = options.params;
-        this.initData();
-        this.init();
-    };
 
     DepDrop.prototype = {
         constructor: DepDrop,
@@ -151,16 +146,19 @@
             self.$element.data('params', self.params);
         },
         init: function () {
-            var self = this, depends = self.depends, $id, $el, $elNew = null, len = depends.length, val = self.$element.val(), pValue = {},
-                chkOptions = self.$element.find('option').length;
-            if (chkOptions == 0 || self.$element.find('option[value=""]').length == chkOptions) {
-                self.$element.attr('disabled', 'disabled');
+            var self = this, depends = self.depends, $id, $el = self.$element, len = depends.length,
+                pValue = {}, chkOptions = $el.find('option').length,
+                handler = function ($elem) {
+                    return function () {
+                        self.setDep($elem, depends, len, false);
+                    };
+                };
+            if (chkOptions === 0 || $el.find('option[value=""]').length === chkOptions) {
+                $el.attr('disabled', 'disabled');
             }
             for (var i = 0; i < len; i++) {
                 $id = $('#' + depends[i]);
-                $id.on('change', function () {
-                    self.setDependency($id, depends, len, false);
-                });
+                $id.on('change', handler($id));
             }
             if (self.initialize === true) {
                 for (var j = 0; j < len; j++) {
@@ -168,30 +166,42 @@
                         pValue[j] = $('#' + depends[j]).val();
                     }
                 }
-                depends[len] = self.$element.attr('id');
-                pValue[len] = self.$element.val();
-                var a = depends.join(), b = '';
+                depends[len] = $el.attr('id');
+                pValue[len] = $el.val();
                 $(document).ready(function () {
-                    initDependency(0, depends, pValue);
+                    initDep(0, depends, pValue);
                 });
             }
 
-            self.$element.trigger('depdrop.init');
+            $el.trigger('depdrop.init');
         },
-        setDependency: function ($id, depends, len, vInitVal) {
-            var self = this, value = {}, initVal = vInitVal, callBack = function () {
-                self.$element.trigger('change');
-            };
+        setDep: function ($elem, depends, len, vInit) {
+            var self = this, $el, typ, value = {}, initVal = vInit,
+                callBack = function () {
+                    self.$element.trigger('change');
+                };
             for (var j = 0; j < len; j++) {
-                var $el = $('#' + depends[j]);
-                value[j] = $el.val();
+                $el = $('#' + depends[j]);
+                typ = $el.attr('type');
+                value[j] = (typ === "checkbox" || typ === "radio") ? $el.prop('checked') : $el.val();
             }
-            $.ajax(getSettings(self.$element, self.url, $id.attr('id'), value,
-                self.placeholder, self.loading, self.loadingClass, self.loadingText, self.emptyMsg, initVal, callBack, self.params));
+            processDep(
+                self.$element,
+                self.url,
+                $elem.attr('id'),
+                value,
+                self.placeholder,
+                self.loading,
+                self.loadingClass,
+                self.loadingText,
+                self.emptyMsg,
+                initVal,
+                callBack,
+                self.params
+            );
         }
     };
 
-    //Dependent dropdown plugin definition
     $.fn.depdrop = function (option) {
         var args = Array.apply(null, arguments);
         args.shift();
@@ -201,7 +211,8 @@
                 options = typeof option === 'object' && option;
 
             if (!data) {
-                $this.data('depdrop', (data = new DepDrop(this, $.extend({}, $.fn.depdrop.defaults, options, $(this).data()))));
+                $this.data('depdrop',
+                    (data = new DepDrop(this, $.extend({}, $.fn.depdrop.defaults, options, $(this).data()))));
             }
 
             if (typeof option === 'string') {
@@ -221,6 +232,8 @@
         params: {}
     };
 
+    $.fn.depdrop.Constructor = DepDrop;
+
     /**
      * Convert automatically select with class 'depdrop'
      * into dependent dropdowns.
@@ -228,4 +241,4 @@
     $(function () {
         $('select.depdrop').depdrop();
     });
-}(jQuery));
+}(window.jQuery));
diff --git a/js/dependent-dropdown.min.js b/js/dependent-dropdown.min.js
index 0ba2802..4f5b06f 100644
--- a/js/dependent-dropdown.min.js
+++ b/js/dependent-dropdown.min.js
@@ -1,10 +1,10 @@
 /*!
  * @copyright &copy; Kartik Visweswaran, Krajee.com, 2014
- * @version 1.3.1
+ * @version 1.4.0
  *
  * A multi level dependent dropdown JQuery plugin. The plugin
  * allows nested and combined dependencies.
  * 
  * For more JQuery plugins visit http://plugins.krajee.com
  * For more Yii related demos visit http://demos.krajee.com
- */ !function(e){var t=function(t,a){return"undefined"==typeof t||null===t||void 0===t||t==[]||""===t||a&&""===e.trim(t)},a=function(t,a,n,i){var l=a==i&&null!==i?{value:a,text:n,selected:"selected"}:{value:a,text:n};e("<option/>",l).appendTo(t)},n=function(t,n,i){var l=e("<select>");return n!==!1&&a(l,"",n,i),e.each(t,function(t,n){if(n.id)a(l,n.id,n.name,i);else{var d=e("<optgroup>",{label:t});e.each(n,function(e,t){a(d,t.id,t.name,i)}),d.appendTo(l)}}),l.html()},l=function(i,l,d,o,r,p,s,g,u,c,f,h){var m=i,v=l,y=d,$=o,x=r,b=0,C=u,T=c,M=f,j={depdrop_parents:$};if(!t(h)){for(var z={},D=0;D<h.length;D++)z[D]=e("#"+h[D]).val();j={depdrop_parents:$,depdrop_params:z}}var _={url:v,type:"post",data:j,dataType:"json",success:function(i){var l=T===!1?t(i.selected)?null:i.selected:T;null==i||0===i.length?a(m,"",C,""):(m.html(n(i.output,x,l)),m.find("optgroup").length>0&&m.find('option[value=""]').attr("disabled","disabled"),0!==i.output.length&&(m.val(l),m.removeAttr("disabled"))),b=m.find("option").length,m.find('option[value=""]').length>0&&b--,m.trigger("depdrop.change",[y,e("#"+y).val(),b,T])}};return _.beforeSend=function(){m.trigger("depdrop.beforeChange",[y,e("#"+y).val(),T]),m.attr("disabled","disabled"),m.html(""),p&&(m.addClass(s),m.html('<option id="">'+g+"</option>"))},_.error=function(){m.trigger("depdrop.error",[y,e("#"+y).val(),T])},_.complete=function(){M(),p&&m.removeClass(s),m.trigger("depdrop.afterChange",[y,e("#"+y).val(),T])},_},d=function(t,a,n){var o,r=(e("#"+a[t]),{}),p=e("#"+a[t+1]),s=a.length;for(i=0;t>=i;i++)o=e("#"+a[i]),r[i]=o.val();var g=n[t+1];s-1>t&&e.ajax(l(p,p.data("url"),p.attr("id"),r,p.data("placeholder"),p.data("loading"),p.data("loadingClass"),p.data("loadingText"),p.data("emptyMsg"),g,function(){d(t+1,a,n)},p.data("params")))},o=function(t,a){this.$element=e(t),this.url=a.url,this.depends=a.depends,this.loading=a.loading,this.loadingClass=a.loadingClass,this.loadingText=a.loadingText,this.placeholder=a.placeholder,this.emptyMsg=a.emptyMsg,this.initialize=a.initialize,this.params=a.params,this.initData(),this.init()};o.prototype={constructor:o,initData:function(){var e=this;e.$element.data("url",e.url),e.$element.data("depends",e.depends),e.$element.data("placeholder",e.placeholder),e.$element.data("loading",e.loading),e.$element.data("loadingClass",e.loadingClass),e.$element.data("loadingText",e.loadingText),e.$element.data("emptyMsg",e.emptyMsg),e.$element.data("initialize",e.initialize),e.$element.data("params",e.params)},init:function(){var t,a=this,n=a.depends,i=n.length,l=(a.$element.val(),{}),o=a.$element.find("option").length;(0==o||a.$element.find('option[value=""]').length==o)&&a.$element.attr("disabled","disabled");for(var r=0;i>r;r++)t=e("#"+n[r]),t.on("change",function(){a.setDependency(t,n,i,!1)});if(a.initialize===!0){for(var p=0;i>p;p++)p>0&&(l[p]=e("#"+n[p]).val());n[i]=a.$element.attr("id"),l[i]=a.$element.val();{n.join()}e(document).ready(function(){d(0,n,l)})}a.$element.trigger("depdrop.init")},setDependency:function(t,a,n,i){for(var d=this,o={},r=i,p=function(){d.$element.trigger("change")},s=0;n>s;s++){var g=e("#"+a[s]);o[s]=g.val()}e.ajax(l(d.$element,d.url,t.attr("id"),o,d.placeholder,d.loading,d.loadingClass,d.loadingText,d.emptyMsg,r,p,d.params))}},e.fn.depdrop=function(t){var a=Array.apply(null,arguments);return a.shift(),this.each(function(){var n=e(this),i=n.data("depdrop"),l="object"==typeof t&&t;i||n.data("depdrop",i=new o(this,e.extend({},e.fn.depdrop.defaults,l,e(this).data()))),"string"==typeof t&&i[t].apply(i,a)})},e.fn.depdrop.defaults={url:"",loading:!0,loadingClass:"kv-loading",loadingText:"Loading ...",placeholder:"Select ...",emptyMsg:"No data found",initialize:!1,params:{}},e(function(){e("select.depdrop").depdrop()})}(jQuery);
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