Split off from http://forums.asp.net/t/1334120.aspx/1?AutoCompleteExtender+OnClientItemSelected+gridview#

    <script type="text/javascript">      

   function IAmSelected(source, eventArgs)

{            

 if (source)

 {               

  // Get the HiddenField ID.           

      var hiddenfieldID = source.get_id().replace("AutoCompleteExtender1", "HiddenField1");        

         $get(hiddenfieldID).value = eventArgs.get_value();            

}            

 alert("HiddenFieldID :" + hiddenfieldID + " HiddenFieldValue : " + $get(hiddenfieldID).value);       

      alert(" Key : " + eventArgs.get_text() + "  Value :  " + eventArgs.get_value());       

  }   

  </script>

This will help me but the problem is that how to call this function before the target control text change event...

Thanks in advanced