RadCombobox JavaScript Error

[vina]

Hi ,
I have an old version (2.7.2.0) of telerik combo box dll. This DLL works well with .Net framework 2.0. But When i am using with .Net 4.0 it gives javascript error.

function

RadComboBox(_11,_12,_13){

var

_14=window[_12];

if

(_14!=null&&!_14.tagName){

 

_14.Dispose();

}

I am getting error on _14.Dispose() method. "Microsoft JScript runtime error: Object doesn't support this property or method". Please let me know why this error i am getting with .net framework 4.0 and how i can fix it.

Thanks in advance. 

[Ivana]

Hello Vina,

I assume you are using the ASP.NET Classic RadControls. The following help article contains an information how to migrate form ASP.NET Classic to ASP.NET AJAX RadControls: http://www.telerik.com/help/aspnet-ajax/combobox-overview-migrating.html.

I hope it helps.

Regards,
Ivana
the Telerik team

[Xafir]

Hi Vina,

I had the excact same problem. The reason is that ASP.NET 4.0 by default uses static client ID's for Server Controls. You can configure your site to render "legacy" client ID's by setting this entry under the system.web node in web.config:

<pages clientIDMode="AutoID" />

See this article:
http://weblogs.asp.net/scottgu/archive/2010/03/30/cleaner-html-markup-with-asp-net-4-web-forms-client-ids-vs-2010-and-net-4-0-series.aspx