ASP.NET UpdatePanel Javascript Callback

I came across this issue recently and thought it was really helpful. My question was, how would you call a piece of javascript after an updatepanel loads via AJAX in ASP.NET?

I needed to reinitialize a jQuery datepicker after the panel had loaded.


<script type=”text/javascript”>

var prm = Sys.WebForms.PageRequestManager.getInstance();

function panelLoaded(sender, args){

    // Your code here



Essentially this is creating an instance of the PageRequestManager which handles all the UpdatePanel loading. Then ties the panelLoaded function to the pageLoaded event.

I also found this article which explains this is much more detail:

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