Radalert popup issue

[Joe]

Just having an issue using the radalert popup functionality...

I'm using the approach from one of the help items like this:

Label1.Text = "<script language='javascript'> window.onload = function(){radalert('<b>Please enter quantity!</b>','', 150, 100);}</script>";

Having RadWindowManager control on the page so that should not be a problem.

However, it gives out an error on this line:
return d.radalert(e,c,a,b);
Microsoft JScript runtime error: 'undefined' is null or not an object

And then:
Microsoft JScript runtime error: Object doesn't support this property or method

Which doesn't seem to make sense, I thought that that was the parameters it was expecting!

[Shinu]

Hello Joe,

Checkout the following KB Article which shows how to show RadAlert from code using RegisterStartupScript() server method of the ScriptManager.
Calling radalert from codebehind (all versions of RadWindow)

Hope this will help,
Shinu.

[Joe]

Shinu, thanks a lot!!

[Georgi Tunev]

Hi Joe,

This is happening because in ASP.NET AJAX, all AJAX controls (including ours) are created on the page after window.onload() (when the script is called). Basically what is happening is that when you try to access the RadWindowManager, it is still not fully rendered on the page, which leads to this error.

More information on the subject is available in the KB that Shinu posted and in this blog post:
http://blogs.telerik.com/supportdept/posts/09-05-05/executing_javascript_function_from_server-side_code.aspx


Regards,
Georgi Tunev
the Telerik team

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[Joe]

Thanks Georgi!