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Using RadXmlHttpPanel with RadAjaxPanel

Customers by Countries
Order IDOrder DateShip NameShip CityShip Country
...51525354555657585960...
 Page 54 of 83, items 531 to 540 of 830.
1077812/16/1997 12:00:00 AMBerglunds snabbköpLuleåSweden
1077912/16/1997 12:00:00 AMMorgenstern GesundkostLeipzigGermany
1078012/16/1997 12:00:00 AMLILA-SupermercadoBarquisimetoVenezuela
1078112/17/1997 12:00:00 AMWartian HerkkuOuluFinland
1078212/17/1997 12:00:00 AMCactus Comidas para llevarBuenos AiresArgentina
1078312/18/1997 12:00:00 AMHanari CarnesRio de JaneiroBrazil
1078412/18/1997 12:00:00 AMMagazzini Alimentari RiunitiBergamoItaly
1078512/18/1997 12:00:00 AMGROSELLA-RestauranteCaracasVenezuela
1078612/19/1997 12:00:00 AMQueen CozinhaSao PauloBrazil
1078712/19/1997 12:00:00 AMLa maison d'AsieToulouseFrance

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.

  • DefaultVB.aspx
  • DefaultVB.aspx.vb
  • scripts.js
<%@ Page Language="vb" AutoEventWireup="true" Inherits="Telerik.Web.Examples.XmlHttpPanel.GridInXmlHttpPanel.DefaultVB"CodeFile="DefaultVB.aspx.vb"  %>

<!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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