ASP.NET AJAX入门系列（6）：使用ScriptManager控件

</ head >

< body  id ="bodytag" >

     < form  id ="form1"  runat ="server" >

         < div >

             < asp:ScriptManager  ID ="ScriptManager1"  runat ="server"  
            OnAsyncPostBackError ="ScriptManager1_AsyncPostBackError" >

             </ asp:ScriptManager >
 
             < script  type ="text/javascript"  language ="javascript" >

                var divElem = 'AlertDiv';

                var messageElem = 'AlertMessage';

                var errorMessageAdditional = 'Please try again.';

                var bodyTag = 'bodytag';
                Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);

                function ToggleAlertDiv(visString)
                {
                     if (visString == 'hidden')

                     {
                         $get(bodyTag).style.backgroundColor = 'white';                         
                     }
                     else
                     {
                         $get(bodyTag).style.backgroundColor = 'gray';                         

                     }

                     var adiv = $get(divElem);

                     adiv.style.visibility = visString;

                }

                function ClearErrorState() {

                     $get(messageElem).innerHTML = '';

                     ToggleAlertDiv('hidden');                     

                }
                function EndRequestHandler(sender, args)

                {
                   if (args.get_error() != undefined && args.get_error().httpStatusCode == '500')
                   {

                       var errorMessage = args.get_error().message

                       args.set_errorHandled(true);

                       ToggleAlertDiv('visible');

                       $get(messageElem).innerHTML = '"' + 

                                errorMessage + '" ' + errorMessageAdditional;

                   }

                }

             </ script >

             < asp:UpdatePanel  runat ="Server"  UpdateMode ="Conditional"  ID ="UpdatePanel1" >

                 < ContentTemplate >

                     < asp:Panel  ID ="Panel1"  runat ="server"  GroupingText ="Update Panel" >

                         < asp:Label  ID ="UpdatePanelMessage"  runat ="server"   />

                         < br  />

                        Last update:

                         <% =  DateTime.Now.ToString()  %>