var Request=new Class({Implements:[Chain,Events,Options],options:{url:'',data:'',headers:{'X-Requested-With':'XMLHttpRequest','Accept':'text/javascript, text/html, application/xml, text/xml, */*'},async:true,format:false,method:'post',link:'ignore',isSuccess:null,emulation:true,urlEncoded:true,encoding:'utf-8',evalScripts:false,evalResponse:false},initialize:function(options){this.xhr=new Browser.Request();this.setOptions(options);this.options.isSuccess=this.options.isSuccess||this.isSuccess;this.headers=new Hash(this.options.headers);},onStateChange:function(){if(this.xhr.readyState!=4||!this.running)return;this.running=false;this.status=0;$try(function(){this.status=this.xhr.status;}.bind(this));if(this.options.isSuccess.call(this,this.status)){this.response={text:this.xhr.responseText,xml:this.xhr.responseXML};this.success(this.response.text,this.response.xml);}else{this.response={text:null,xml:null};this.failure();}
this.xhr.onreadystatechange=$empty;},isSuccess:function(){return((this.status>=200)&&(this.status<300));},processScripts:function(text){if(this.options.evalResponse||(/(ecma|java)script/).test(this.getHeader('Content-type')))return $exec(text);return text.stripScripts(this.options.evalScripts);},success:function(text,xml){this.onSuccess(this.processScripts(text),xml);},onSuccess:function(){this.fireEvent('complete',arguments).fireEvent('success',arguments).callChain();},failure:function(){this.onFailure();},onFailure:function(){this.fireEvent('complete').fireEvent('failure',this.xhr);},setHeader:function(name,value){this.headers.set(name,value);return this;},getHeader:function(name){return $try(function(){return this.xhr.getResponseHeader(name);}.bind(this));},check:function(caller){if(!this.running)return true;switch(this.options.link){case'cancel':this.cancel();return true;case'chain':this.chain(caller.bind(this,Array.slice(arguments,1)));return false;}
return false;},send:function(options){if(!this.check(arguments.callee,options))return this;this.running=true;var type=$type(options);if(type=='string'||type=='element')options={data:options};var old=this.options;options=$extend({data:old.data,url:old.url,method:old.method},options);var data=options.data,url=options.url,method=options.method;switch($type(data)){case'element':data=$(data).toQueryString();break;case'object':case'hash':data=Hash.toQueryString(data);}
if(this.options.format){var format='format='+this.options.format;data=(data)?format+'&'+data:format;}
if(this.options.emulation&&['put','delete'].contains(method)){var _method='_method='+method;data=(data)?_method+'&'+data:_method;method='post';}
if(this.options.urlEncoded&&method=='post'){var encoding=(this.options.encoding)?'; charset='+this.options.encoding:'';this.headers.set('Content-type','application/x-www-form-urlencoded'+encoding);}
if(data&&method=='get'){url=url+(url.contains('?')?'&':'?')+data;data=null;}
this.xhr.open(method.toUpperCase(),url,this.options.async);this.xhr.onreadystatechange=this.onStateChange.bind(this);this.headers.each(function(value,key){if(!$try(function(){this.xhr.setRequestHeader(key,value);return true;}.bind(this)))this.fireEvent('exception',[key,value]);},this);this.fireEvent('request');this.xhr.send(data);if(!this.options.async)this.onStateChange();return this;},cancel:function(){if(!this.running)return this;this.running=false;this.xhr.abort();this.xhr.onreadystatechange=$empty;this.xhr=new Browser.Request();this.fireEvent('cancel');return this;}});(function(){var methods={};['get','post','put','delete','GET','POST','PUT','DELETE'].each(function(method){methods[method]=function(){var params=Array.link(arguments,{url:String.type,data:$defined});return this.send($extend(params,{method:method.toLowerCase()}));};});Request.implement(methods);})();Element.Properties.send={set:function(options){var send=this.retrieve('send');if(send)send.cancel();return this.eliminate('send').store('send:options',$extend({data:this,link:'cancel',method:this.get('method')||'post',url:this.get('action')},options));},get:function(options){if(options||!this.retrieve('send')){if(options||!this.retrieve('send:options'))this.set('send',options);this.store('send',new Request(this.retrieve('send:options')));}
return this.retrieve('send');}};Element.implement({send:function(url){var sender=this.get('send');sender.send({data:this,url:url||sender.options.url});return this;}});