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Using RadXmlHttpPanel with RadAjaxPanel

Customers by Countries
Order IDOrder DateShip NameShip CityShip Country
...74757677787980818283
 Page 82 of 83, items 811 to 820 of 830.
110584/29/1998 12:00:00 AMBlauer See DelikatessenMannheimGermany
110594/29/1998 12:00:00 AMRicardo AdocicadosRio de JaneiroBrazil
110604/30/1998 12:00:00 AMFranchi S.p.A.TorinoItaly
110614/30/1998 12:00:00 AMGreat Lakes Food MarketEugeneUSA
110624/30/1998 12:00:00 AMReggiani CaseificiReggio EmiliaItaly
110634/30/1998 12:00:00 AMHungry Owl All-Night GrocersCorkIreland
110645/1/1998 12:00:00 AMSave-a-lot MarketsBoiseUSA
110655/1/1998 12:00:00 AMLILA-SupermercadoBarquisimetoVenezuela
110665/1/1998 12:00:00 AMWhite Clover MarketsSeattleUSA
110675/4/1998 12:00:00 AMDrachenblut DelikatessenAachenGermany

The following example demonstrates how to benefit by using the RadAjaxPanel combined with the RadXmlHttpPanel.

A RadGrid is hosted in a RadXmlHttpPanel, and the RadXmlHttpPanel itself is wrapped by a RadAjaxPanel. The RadXmlHttpPanel populates the RadGrid by loading on-demand content, while the RadAjaxPanel ensures that all of the (RadGrid's) events are fired correctly and trigger Ajax partial updates. This way we have optimum performance and take full advantage of what each panel does best.

Note: RadGrid's Insert/Update/Delete operations are not supported in this scenario (RadXmlHttpPanel in RadAjaxPanel), because they rely heavily on the ViewState. Since the ViewState is not updated on ASP.NET client callbacks, on the next row Insert/Update/Delete the incorrect row will be affected, and this will cause data inconsistency. That's why this setup should be used in simpler scenarios, where the ViewState is not that important.

  • DefaultCS.aspx
  • DefaultCS.aspx.cs
  • scripts.js
<%@ Page Language="c#" AutoEventWireup="true" Inherits="Telerik.Web.Examples.XmlHttpPanel.GridInXmlHttpPanel.DefaultCS"CodeFile="DefaultCS.aspx.cs"  %>

<!DOCTYPE html>
<html xmlns='http://www.w3.org/1999/xhtml'>
<head runat="server">
    <title>Telerik ASP.NET Example</title>
</head>
<body>
    <form id="form1" runat="server">
    <telerik:RadScriptManager runat="server" ID="RadScriptManager1" />
    <telerik:RadSkinManager ID="RadSkinManager1" runat="server" ShowChooser="true" />
    <div class="demo-container">
        <div style="margin-bottom: 10px;">
            <span style="margin-right: 15px;">Customers by Countries</span>
            <telerik:RadComboBox RenderMode="Lightweight" ID="RadComboBox1" runat="server" OnClientSelectedIndexChanged="telerikDemo.setValue"
                AllowCustomText="true" Filter="Contains" DataSourceID="SqlDataSource1" DataTextField="Country" EmptyMessage="Choose a country..."
                Style="">
            </telerik:RadComboBox>
        </div>
        <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>"
            SelectCommand="SELECT DISTINCT [Country] FROM [Customers] Order By [Country]"></asp:SqlDataSource>
        <telerik:RadAjaxPanel ID="RadAjaxPanel1" runat="server">
            <telerik:RadXmlHttpPanel ID="RadXmlHttpPanel1" runat="server" EnableClientScriptEvaluation="true"
                OnServiceRequest="XmlHttpPanel1_ServiceRequest" RenderMode="Block">
                <telerik:RadGrid RenderMode="Lightweight" ID="RadGrid1" runat="server" OnNeedDataSource="RadGrid1_NeedDataSource"
                    Width="100%" AllowSorting="True" PageSize="10" AllowPaging="True" AllowMultiRowSelection="True"
                    GridLines="None">
                    <PagerStyle Mode="NumericPages"></PagerStyle>
                </telerik:RadGrid>
            </telerik:RadXmlHttpPanel>
        </telerik:RadAjaxPanel>
    </div>
    <script src="scripts.js" type="text/javascript"></script>
    <telerik:RadScriptBlock ID="RadScriptBlock1" runat="server">
        <script type="text/javascript">
            Sys.Application.add_load(function() {
                telerikDemo.radXmlHttpPanel = $find("<%=RadXmlHttpPanel1.ClientID %>");
            });
        </script>
    </telerik:RadScriptBlock>
    </form>
</body>
</html>

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