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HomeHomeArchived Discus...Archived Discus...Developing Under Previous Versions of .NETDeveloping Under Previous Versions of .NETASP.Net 2.0ASP.Net 2.0Handling exceptions during AJAX callsHandling exceptions during AJAX calls
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8/20/2009 2:07 PM
 
Vivek Athalye

Joined: 12/26/2008
Posts: 9

Hello,

Basic requirement: In our project we want to show a friendly error message in a modal popup when some exception occures during AJAX calls.

I tried the example given @ http://www.asp.net/AJAX/documentation/live/Tutorials/CustomizingErrorHandlingforUpdatePanel.aspx

When I create a separate ASPX page and follow the steps mentioned in that tutorial, it works well.

But when I try to follow the same steps in a DNN module, it doesn't work. Ofcourse I'm NOT adding any ScriptManager explicitly in the module. Instead I'm using the ScriptManager returned by DotNetNuke.Framework.AJAX.ScriptManagerControl(Page). Using this script manager I'm registering my ScriptManager1_AsyncPostBackError() method for the AsyncPostBackError event. But this method never gets executed. This is because whenever any exception occurs PageBase.Page_Error() method gets executed first [we are using DNN 4.9.0], which redirects the user to error page. As this method is declared private I can't even override it in Default.aspx.vb.

If I override OnError() method in Default.aspx.vb then it stops redirecting to error page. But in this case it doesn't cause the AsyncPostBackError event and I don't get the expected behaviour. In this case I'm able to show a modal popup on client side, but the error message received is always:

Sys.Webforms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server.
The status code returned from the server was: 500

Instead what I want is to see the message that I set to ScriptManager1.AsyncPostBackErrorMessage inside ScriptManager1_AsyncPostBackError().

Is there any way to do it?

 

Thanks & Regards,
- Vivek Athalye

 
 
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8/21/2009 7:42 AM
 
Vivek Athalye

Joined: 12/26/2008
Posts: 9

Hello,

Now I've removed the Page_Error event handler using RemoveHandler inside Page_Load method of Default.aspx.vb. This resolves my problem of Response.Redirect. I can see the actual exception message in modal popup. Or whatever string I set to ScriptManager.AsyncPostBackErrorMessage. But I've to set the message in Page_Load method of my module. The ScriptManager.AsyncPostBackError is not getting fired. I don't know why!!

Here is the Page_Load method of my module:

        protected void Page_Load(System.Object sender, System.EventArgs e)
        {
            try
            {
                AJAX.AddScriptManager(Page);
                using (ScriptManager manager = AJAX.ScriptManagerControl(Page) as ScriptManager)
                {
                    manager.AsyncPostBackErrorMessage = "ERRRRRRRRRR";
                    manager.AsyncPostBackError += this.ScriptManager1_AsyncPostBackError;
                }
            }
            catch (Exception exc) //Module failed to load
            {
                Exceptions.ProcessModuleLoadException(this, exc);
            }
        }
 

 Can some one tell me what could be stopping AsyncPostBackError event from firing?

Now I'm trying to fire this event explicitly inside OnError() method of Default.aspx.vb, but I'm not able to do it. Can this be done?

        Protected Overrides Sub OnError(ByVal e As System.EventArgs)

            ' RaiseEvent AsyncPostBackError <<< how??
            MyBase.OnError(e)

        End Sub

 

Thanks & Regards,
- Vivek Athalye

 
 
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