jQuery Forum

// Assign handlers immediately after making the request,
// and remember the jqXHR object for this request
var jqxhr = $.ajax( "example.php" )
  .done(function() {
    alert( "success" );
  })
  .fail(function() {
    alert( "error" );
  })  .MyCustom(function() {
    alert( "Item Already Exists In the List" );
  })
  .always(function() {
    alert( "complete" );
  });
}

1.  <!--This is where I filter the ListBox (select) >> (option) elements via keystrokes -->
   <!--Via jQuery on my Listbox control I add a css class so I can work with it here - class ".srcItem" -->
   <script type="text/javascript">
       $(document).ready(
           function () {
               var elemSrc = document.getElementById("<%=srcBox.ClientID%>");
               $(elemSrc).find("option").addClass("srcItem");
           }
           );
   </script>
   
   <script type="text/javascript">
       $(document).ready(
        function () {
            var $users = $('.srcItem');
            $('#usrSearch').keyup(function () {
                $users.show(); //THis is regular jQuery that works only in Chrome
   
                    return;
                }
                var val = $.trim($(this).val()).replace(/ +/g, ' ').toLowerCase();
   
                //Below is regular jQuery that works only in Chrome
   
                $users.show().filter(function () {
                    var text = $(this).text().replace(/\s+/g, ' ').toLowerCase();
                    return !~text.indexOf(val);
   
                }).hide();
   
            });
        }
      );
   
   </script>