How to make an ASP.NET TextBox fire it’s onTextChanged event fire in an AJAX UpdatePanel?

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  • You need to call the _postback() function for your textbox control when the onkeyup is raised using javascript.
  • However, since your textbox is inside your update panel, the textbox will get re-rendered everytime the user hits a key, causing the cursor to loose focus.
  • This will not be usable unless you get your textbox out of the the updatepanel. That may work out for you, as update panels tend to be a bit slow, you may still have usability issues. – I would suggest using an autocomplete component.

P.S : there is one in the asp.net control toolkit or you could use the jquery autocomplete plugin which I have found to be a bit better.

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