Why does this Alert box work perfectly using IE8, but shows nothing using IE9?

 

Also, data.length never shows anything in Alert box!

 

  $("[id$=txtData]").blur(function(event) 
  {               
         var data = $.trim($(this).closest("tr").find("[id$=txtData]").text());

         alert(data);

  });

 

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" Width="900px">

< Columns >

    < asp : TemplateField HeaderText ="Id">

       < ItemTemplate >

          <asp:TextBox ID="txtData" runat="server" Text="" style=" height: 44px; width: 100px"></asp:TextBox>

       </ ItemTemplate >

     </ asp : TemplateField >

</ Columns >

</ asp : GridView >