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Cannot read property 'firstChild' of null

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Solgenia
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Solgenia asked on 27 Nov 2013, 01:16 PM
Hi, I am getting this error in Chrome (it's "unable to get property 'firstchild' of undefined or null reference" in IE) when trying to open a RadWindow as a result of a callback.
Subsequent calls of the same callback throw "Cannot read property 'style' of null".
In the callback there's a RadWindowManager.open(url, "popupwnd") that calls some JQuery which in turn definitely throws this error.

I tried every version from 2013.2.717 to the latest nightly build. It still works fine in version 2013.1.417, but I need to support IE11.

Any idea on how to fix or debug it?

Thanks

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Marin Bratanov
Telerik team
answered on 29 Nov 2013, 09:07 AM
Hi,

Could you share the code you are using so we can examine the case? This is not a known problem, so at this point I could only be guessing what the setup could be. Could you also explain what you mean with callback - a client callback or a partial postback?

In case you are using postbacks it is possible that the Sys.Application.Load event needs to be used, as shown here: http://www.telerik.com/community/forums/aspnet-ajax/window/opening-radwindow-from-the-server.aspx. The alternative is to make sure the RadWindowManager is not disposed with the postback.


Regards,
Marin Bratanov
Telerik
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Solgenia
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answered on 03 Dec 2013, 10:08 AM
Hi Marin,
thanks for your answer.
I was assembling a test project, when I discovered the problem: an old Telerik script we changed to have IE10 compatibility before the official support.
Regards
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Solgenia
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