ASP.NET Tutorial/Ajax/Error Handlers

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Customizing a client-side error message.

   <source lang="csharp">

<%@ Page Language="C#" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server"> 

   protected void btnSubmit_Click(object sender, EventArgs e)
   {
       throw new Exception("Server Error");
   }
   protected void sm1_AsyncPostBackError(object sender, AsyncPostBackErrorEventArgs e)
   {
       sm1.AsyncPostBackErrorMessage = "A server error occurred";
   }

</script> <html xmlns="http://www.w3.org/1999/xhtml"> <head id="Head1" runat="server"> 

   <title>UpdatePanel Error Server</title>
   <style type="text/css">
   .errorMessage
   {
       background-color: Yellow;
       color: Red;
   }
   </style>

</head> <body> 

   <form id="form1" runat="server">
   <asp:ScriptManager
       id="sm1"
       OnAsyncPostBackError="sm1_AsyncPostBackError"
       Runat="server" />
   
   <asp:UpdatePanel
       id="up1"
       runat="server">
       <ContentTemplate>
       <asp:Button
           id="btnSubmit"
           Text="Submit"
           OnClick="btnSubmit_Click"
           Runat="server" />
       </ContentTemplate>
   </asp:UpdatePanel>
   </form>
   <script type="text/javascript">
   var prm = Sys.WebForms.PageRequestManager.getInstance();
   prm.add_endRequest( prm_endRequest );
   function prm_endRequest(sender, args)
   {
       var spanError = $get("spanError");
       if (args.get_error())
       {
           args.set_errorHandled(true);
           spanError.innerHTML = "Could not complete your request";
       }
       else
       {
           spanError.innerHTML = "";
       }
   }
   </script>

</body> </html></source>

Источник — «http://nfex.ru/index.php?title=ASP.NET_Tutorial/Ajax/Error_Handlers&oldid=3032»