How to get Id update panel that initial a request in javascript

Question

I want to know Id update panel that initial a request in JavaScript .I write this script but it return undefined.

var prm = Sys.WebForms.PageRe         


        

Answer 1

You can use the get_updatePanelsToUpdate that return an array with the Ids of the UpdatePanels that will be going to updated.

<script>
    window.onload = function() {
        var prm = Sys.WebForms.PageRequestManager.getInstance();

        prm.add_initializeRequest(InitializeRequest);
        prm.add_endRequest(EndRequest);
    };

      function InitializeRequest(sender, args) 
      {     
         // get the array of update panels id
         var UpdPanelsIds = args.get_updatePanelsToUpdate();
         // get the Post ID
         args.get_postBackElement().id;
      }

      function EndRequest(sender, args) {
      }
</script>

http://msdn.microsoft.com/en-us/library/ee224805.aspx