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Using RadXmlHttpPanel with RadAjaxPanel

Customers by Countries
Order IDOrder DateShip NameShip CityShip Country
...51525354555657585960...
 Page 57 of 83, items 561 to 570 of 830.
108081/1/1998 12:00:00 AMOld World DelicatessenAnchorageUSA
108091/1/1998 12:00:00 AMWellington ImportadoraResendeBrazil
108101/1/1998 12:00:00 AMLaughing Bacchus Wine CellarsVancouverCanada
108111/2/1998 12:00:00 AMLINO-DelicatesesI. de MargaritaVenezuela
108121/2/1998 12:00:00 AMReggiani CaseificiReggio EmiliaItaly
108131/5/1998 12:00:00 AMRicardo AdocicadosRio de JaneiroBrazil
108141/5/1998 12:00:00 AMVictuailles en stockLyonFrance
108151/5/1998 12:00:00 AMSave-a-lot MarketsBoiseUSA
108161/6/1998 12:00:00 AMGreat Lakes Food MarketEugeneUSA
108171/6/1998 12:00:00 AMKöniglich EssenBrandenburgGermany

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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