WebMethod Unspecified error.

[Louis-Philippe]

Hello,
I have a bunch of radComboBox inside a userControl that is use as a editForm. To fill those comboBox, I'm using WebMethod witch works fast, but if the user click to expand a second comboBox while the first haven't finish to load it's items, I receive a "Unspecified error.". I tried to deactivate all animation to accelerate the switch, but no luck. The error only happen if both comboBox haven't been filled before. After the error happened, Internet Explorer give me a debugging option. Here's where the error happened

_onReadyStateChange=function(){if(a._xmlHttpRequest.readyState===4){try{if(typeof a._xmlHttpRequest.status==="undefined")return}catch(b){return}a._clearTimer();a._responseAvailable=true;try{a._webRequest.completed(Sys.EventArgs.Empty)}finally{

***** debugger stop here *********************

if(a._xmlHttpRequest!=null){a._xmlHttpRequest.onreadystatechange=Function.emptyMethod;a._xmlHttpRequest=null}}}};this._clearTimer=function(){if(a._timer!=null){window.clearTimeout(a._timer);a._timer=null}};this._onTimeout=function(){if(!a._responseAvailable){a._clearTimer();a._timedOut=true;a._xmlHttpRequest.onreadystatechange=Function.emptyMethod;a._xmlHttpRequest.abort();a._webRequest.completed(Sys.EventArgs.Empty);a._xmlHttpRequest=null}}};Sys.Net.XMLHttpExecutor.prototype={get_timedOut:function(){return this._timedOut},get_started:function(){return this._started},get_responseAvailable:function(){return this._responseAvailable},get_aborted:function(){return this._aborted},executeRequest:function(){this._webRequest=this.get_webRequest();var c=this._webRequest.get_body(),a=this._webRequest.get_headers();this._xmlHttpRequest=new XMLHttpRequest;this._xmlHttpRequest.onreadystatechange=this._onReadyStateChange;var e=this._webRequest.get_httpVerb();this._xmlHttpRequest.open(e,this._webRequest.getResolvedUrl(),true);this._xmlHttpRequest.setRequestHeader("X-Requested-With","XMLHttpRequest");if(a)for(var b in a){var f=a[b];if(typeof f!=="function")this._xmlHttpRequest.setRequestHeader(b,f)}if(e.toLowerCase()==="post"){if(a===null||!a["Content-Type"])this._xmlHttpRequest.setRequestHeader("Content-Type","application/x-www-form-urlencoded; charset=utf-8");if(!c)c=""}var d=this._webRequest.get_timeout();if(d>0)this._timer=window.setTimeout(Function.createDelegate(this,this._onTimeout),d);this._xmlHttpRequest.send(c);this._started=true},getResponseHeader:function(b){var a;try{a=this._xmlHttpRequest.getResponseHeader(b)}catch(c){}if(!a)a="";return a},getAllResponseHeaders:function(){return this._xmlHttpRequest.getAllResponseHeaders()},get_responseData:function(){return this._xmlHttpRequest.responseText},get_statusCode:function(){var a=0;try{a=this._xmlHttpRequest.status}catch(b){}return a},get_statusText:function(){return this._xmlHttpRequest.statusText},get_xml:function(){var a=this._xmlHttpRequest.responseXML;if(!a||!a.documentElement){a=Sys.Net.XMLDOM(this._xmlHttpRequest.responseText);if(!a||!a.documentElement)return null}else if(navigator.userAgent.indexOf("MSIE")!==-1)a.setProperty("SelectionLanguage","XPath");if(a.documentElement.namespaceURI==="http://www.mozilla.org/newlayout/xml/parsererror.xml"&&a.documentElement.tagName==="parsererror")return null;if(a.documentElement.firstChild&&a.documentElement.firstChild.tagName==="parsererror")return null;return a},abort:function(){if(this._aborted||this._responseAvailable||this._timedOut)return;this._aborted=true;this._clearTimer();if(this._xmlHttpRequest&&!this._responseAvailable){this._xmlHttpRequest.onreadystatechange=Function.emptyMethod;this._xmlHttpRequest.abort();this._xmlHttpRequest=null;this._webRequest.completed(Sys.EventArgs.Empty)}}};Sys.Net.XMLHttpExecutor.registerClass("Sys.Net.XMLHttpExecutor",Sys.Net.WebRequestExecutor);Sys.Net._WebRequestManager=function(){this._defaultTimeout=0;this._defaultExecutorType="Sys.Net.XMLHttpExecutor"};Sys.Net._WebRequestManager.prototype={add_invokingRequest:function(a){this._get_eventHandlerList().addHandler("invokingRequest",a)},remove_invokingRequest:function(a){this._get_eventHandlerList().removeHandler

I personally have no idea how to use this information... How can the problem be solved? Should the loading call of the first comboBox get cancel or maybe prevent all other comboBox to initiate their items loading while loading is already in progress?

Thank you for your time,
Louis-Philippe Giroux

[Hank]

I get the same response. Did you resolve this issue?

[Dimitar Terziev]

Hi Guys,

This problem might occur if the previous callback to the server hasn't finished and you initiate a new one. In order to overcome this limitation you should subscribe in the client-side OnClientItemsRequesting event and cancel it, if the other comboboxes are not populated.

Best wishes,
Dimitar Terziev
the Telerik team