Set focus to textbox after postback

In my web application which is developed using ajax, I had a problem. My textbox lost its focus after a postback, so I supposed to solve this issue with the textbox. Then I came with a solution using javascript. This may be helpful to some one

Put this javascript on your updatepanel page. You may have to change controls id strings.

<script type="text/javascript">

  var postbackElement;

  Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(beginRequest);

  Sys.WebForms.PageRequestManager.getInstance().add_pageLoaded(pageLoaded);

 

  function beginRequest(sender, args) {

      postbackElement = args.get_postBackElement();

  }

        

  function pageLoaded(sender, args) 

    {

      var updatedPanels = args.get_panelsUpdated();

      if (typeof(postbackElement) === "undefined") 

     {

          return;

      }

      else if (postbackElement.id.toLowerCase().indexOf('button1') > -1) 

       {

          for (i=0; i < updatedPanels.length; i++) { 

              alert('here');         

              document.getElementById('<%= TextBox1.ClientID %>').focus();

          }

      }

 

  }

</script>