(function($,undefined){'use strict';var defaultOptions={usePost:false,useJson:false,selectBoxes:[]};function Dropdown(options,parent){this.el=$(options.selector,parent.el);this.parent=parent;this.options=$.extend({},defaultOptions,options);this.name=this.options.paramName||this.el.attr('name');this.requiredDropdowns=options.requires&&options.requires.length?$(options.requires.join(','),parent.el):null;this.isLoadingClassName=this.options.isLoadingClassName||parent.options.isLoadingClassName||'cascading-dropdown-loading';}
Dropdown.prototype={_create:function(){var self=this;self.pending=0;self.initialised=false;self.originalDropdownItems=self.el.children('option');if(typeof self.options.onChange==='function'){self.el.change(function(event){self.options.onChange.call(self,event,self.el.val(),self.getRequiredValues());});}
if(self.requiredDropdowns){self.requiredDropdowns.change(function(event){self.update();});}
self._initSource();self.update();},enable:function(){return this.el.removeAttr('disabled').trigger('enabled');},disable:function(){return this.el.attr('disabled','disabled').trigger('disabled');},_requirementsMet:function(){var self=this;if(!self.requiredDropdowns){return true;}
if(self.options.requireAll){return(self.requiredDropdowns.filter(function(){return!!$(this).val();}).length==self.options.requires.length);}else{return(self.requiredDropdowns.filter(function(){return!!$(this).val();}).length>0);}},_initSource:function(){var self=this;if($.isArray(self.options.source)){this.source=function(request,response){response($.map(self.options.source,function(item){return{label:item.label||item.value||item,value:item.value||item.label||item};}));};}else if(typeof self.options.source==="string"){var url=self.options.source;this.source=function(request,response){if(self.xhr){self.xhr.abort();}
self.xhr=$.ajax({url:url,data:self.options.useJson?JSON.stringify(request):request,dataType:self.options.useJson?'json':undefined,type:self.options.usePost?'post':'get',contentType:'application/json; charset=utf-8',success:function(data){response(data);},error:function(){response([]);}});};}else{this.source=self.options.source;}},getRequiredValues:function(){var data={};if(this.requiredDropdowns){$.each(this.requiredDropdowns,function(){var instance=$(this).data('plugin_cascadingDropdown');if(instance.name){data[instance.name]=instance.el.val();}});}
return data;},update:function(){var self=this;self.disable();if(!self.initialised){self.options.selected&&self.setSelected(self.options.selected);}
if(!self._requirementsMet()){self._triggerReady();return self.el;}
if(!self.source){self.enable();self._triggerReady();return self.el;}
var data=self.getRequiredValues();self.pending++;self.el.addClass(self.isLoadingClassName);self.source(data,self._response());return self.el;},_response:function(items){var self=this;return function(items){self._renderItems(items);self.pending--;if(!self.pending){self.el.removeClass(self.isLoadingClassName);}}},_renderItems:function(items){var self=this;self.el.children('option').remove();self.el.append(self.originalDropdownItems);if(!items||!items.length){self._triggerReady();return;}
var selected;$.each(items,function(index,item){var selectedAttr='';if(item.selected){selected=item;}
self.el.append('<option value="'+ item.value+'"'+ selectedAttr+'>'+ item.label+'</option>');});self.enable();selected&&self.setSelected(selected.value.toString());self._triggerReady();},_triggerReady:function(){if(!this.initialised){this.initialised=true;this.el.trigger('ready');}},setSelected:function(indexOrValue,triggerChange){var self=this,dropdownItems=self.el.find('option');if(typeof triggerChange==='undefined'){triggerChange=true;}
if(typeof indexOrValue==='string'){indexOrValue=dropdownItems.index(dropdownItems.filter('[value="'+ indexOrValue+'"]')[0]);}
if(indexOrValue===undefined||indexOrValue<0||indexOrValue>dropdownItems.length){return;}
self.el[0].selectedIndex=indexOrValue;if(triggerChange){self.el.change();}
return self.el;}};function CascadingDropdown(element,options){this.el=$(element);this.options=$.extend({selectBoxes:[]},options);this._init();}
CascadingDropdown.prototype={_init:function(){var self=this;self.pending=0;self.dropdowns=[];var dropdowns=$($.map(self.options.selectBoxes,function(item){return item.selector;}).join(','),self.el);var counter=0;function readyEventHandler(event){if(++counter==dropdowns.length){dropdowns.unbind('ready',readyEventHandler);self.options.onReady.call(self,event,self.getValues());}}
function changeEventHandler(event){self.options.onChange.call(self,event,self.getValues());}
if(typeof self.options.onReady==='function'){dropdowns.bind('ready',readyEventHandler);}
if(typeof self.options.onChange==='function'){dropdowns.bind('change',changeEventHandler);}
$.each(self.options.selectBoxes,function(index,item){var instance=new Dropdown(this,self);$(this.selector,self.el).data('plugin_cascadingDropdown',instance);self.dropdowns.push(instance);instance._create();});},getValues:function(){var values={};$.each(this.dropdowns,function(index,instance){if(instance.name){values[instance.name]=instance.el.val();}});return values;}}
$.fn.cascadingDropdown=function(methodOrOptions){var $this=$(this),args=arguments,instance=$this.data('plugin_cascadingDropdown');if(typeof methodOrOptions==='object'||!methodOrOptions){return!instance&&$this.data('plugin_cascadingDropdown',new CascadingDropdown(this,methodOrOptions));}else if(typeof methodOrOptions==='string'){if(!instance){$.error('Cannot call method '+ methodOrOptions+' before init.');}else if(instance[methodOrOptions]){return instance[methodOrOptions].apply(instance,Array.prototype.slice.call(args,1))}}else{$.error('Method '+ methodOrOptions+' does not exist in jQuery.cascadingDropdown');}};})(jQuery);