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[Solved] PageRequestManagerParserError exception

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Ajax

This is a migrated thread and some comments may be shown as answers.

PaulMrozowski asked on 02 May 2008, 01:27 PM

I've got a user control which has a number of controls on it (one of which is a RadGrid). I have a client-side event handler hooked up to it to cause a postback when you double-click on a row. My user control implements IPostBackEventHandler and processes the request. This is currently working.

Now I'd like to add a RadAjaxManager (v2007.3.1425.35) to the page, but can't seem to get it to work correctly (and I also have a few questions about it). I added RadAjaxManager to the page, set the various properties based on what to update when, and then ran my test page. When a postback occurs, it keeps failing back on the client side with,

"Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed."

Since this is a user control, it occurred to me that I'll have problems using RadAjaxManager in the UC if I happen to have more than one of these controls on a form (or my form is already using RadAjaxManager). So I pulled the RadAjaxManager code out and moved it into my ASPX page, and adjusted the AjaxSettings control for the user control as the source and as the updated control. I re-ran the page and I still receive the "Sys.WebForms.PageRequestManagerParserErrorException" error.

Any thoughts on what I'm missing/what is causing the error? Also, it appears like I can't have as fine-grained control of the Ajax updating process in user controls because I can only have RadAjaxManager appear once on a page. Or am I missing something?

6 Answers, 1 is accepted

answered on 02 May 2008, 01:53 PM

Hi PaulMrozowski,

This is correct -- you can have a single RadAjaxManager per application. If you need some design-time configuration within the user controls, you can add there a RadAjaxManagerProxy control:

http://www.telerik.com/demos/aspnet/prometheus/Ajax/Examples/Manager/UserControl/DefaultCS.aspx

In case of some setting, which would require relations (ajaxify/update) between different naming containers, you can add the necessary settings dynamically. You will find more info here.

Let us know if you need further assistance.

All the best,
Konstantin Petkov
the Telerik team

Instantly find answers to your questions at the new Telerik Support Center

answered on 07 May 2008, 05:05 PM

I don't think the output caching is the cause (or the only cause) of this issue. I'm getting the same error and I don't have output caching anywhere in my application.

In my scenario, I have an AjaxManager that I'm using with a RadToolbar and some labels. I also have a RadTreeView wrapped in an AjaxPanel on the same page. Whenever I have the RadTreeView postback, I get that error message. But if I take away the AjaxManager on the page, then it works fine. Can you have an AjaxManager and an AjaxPanel on the same page?

Thanks,
Matt