ajax update panel Microsoft JScript runtime error: Sys.InvalidOperationException: Handler was not added through the Sys.UI.DomEvent.addHandler method.

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I have grid view that is inside the update panel i thave to cascade drop down that filters the grid content.
i am getting this error when i am closing my page Microsoft JScript runtime error: Sys.InvalidOperationException: Handler was not added through the Sys.UI.DomEvent.addHandler method.

When i remove update panel then it works fine

Thanks in advance

Please replay fast

Posted 7-Nov-11 2:07am

pawantiwari52

Updated 5-Oct-16 16:50pm

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suryakant4it · Answer 1 · 2012-07-06T00:58:00

Solution 3

set ScriptMode="Release" for script manager

Posted 6-Jul-12 0:58am

suryakant4it

Comments

Venkateshan.P 16-Aug-12 7:24am

This is great , and working fine

Bhargava Katta 13-Mar-13 1:44am

i too got resolved that issue, bt its effecting other events.

i have update panel and a ajax modelpopup. i m getting Sys.InvalidOperationException: Handler was not added through the Sys.UI.DomEvent.addHandler method. i got resolved this by ScriptMode="Release". but my modal popup close button event which i am handling in code behind is not firing, and its giving javascript error as click event not found.

thatraja · Answer 2 · 2011-11-07T02:14:00

Solution 1

Fix links

Dealing with "Sys.InvalidOperationException: Handler was not added through the Sys.UI.DomEvent.addHandler method."[^]
Ajax Controls Toolkit: ModalPopup extender with UpdatePanel[^]

Posted 7-Nov-11 2:14am

thatraja

Ngo Thanh Tung - Softech · Answer 3 · 2015-10-15T01:46:00

Solution 4

Update to latest version of AJAX Toolkit will be OK

Posted 15-Oct-15 1:46am

Ngo Thanh Tung - Softech