AJAX :: Javasript Error 'this.get_element() Is Null Or Not An Object'?

Jun 23, 2010

While testing an AJAX enabled web app I sometimes stumbled upon this script error: 'this.get_element().style' is null or not an object. It was a hard nut to crack this one.This was the actual message

'this.get_element() is null or not an object'

The situation:AJAX Enabled web app using slider extenders . In some circumstances a script error is generated. In most cases it is not.

The reason:It turned out that the error happens at times when a new Postback is triggered while a previous one hasnt finished yet. That is quickly changing the sliderhandle's position in this scenario. The Postback where triggered because i had set the AutoPostBack property of the extended TextBox to "true".I have some code running inside the event handler

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