Asp.Net: UpdatePanel Javascript on EndRequest

Question:

I want to trigger some javascript function after a postback of my Asp.Net UpdatePanel. How do I do this?
How to execute js after UpdatePanel postback?

Answer:

This is simple and standard.
You register a function with the PageRequestManager EndRequest trigger.

The EndRequest is evidently called on each and every ajax request.

Here is an example

<script type="text/javascript">

Sys.WebForms.PageRequestManager.getInstance().add_endRequest(endRequest);

function endRequest(sender, args)
{
  // your code goes here
  // you could handle your error here
  if (args.get_error() != undefined) {
    //$get('Error').style.visibility = "visible";
    // Let the framework know that the error is handled,
    // so it doesn't throw the JavaScript alert.
    args.set_errorHandled(true);
  }

}

</script>