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The OnClientResponseEnding client-side event replaces the existing OnClientResponseEnd client-side event . Please note that although the OnClientResponseEnding should be used from now on, the OnClientResponseEnd is still present in the control’s API so that any existing applications are not broken after an upgrade to a newer version of the control.

The OnClientResponseEnding occurs before the data (content) is pasted into the RadXmlHttpPanel, after a partial update request has been initiated by the RadXmlHttpPanel set_value method.

The event handler receives two parameters:

  1. The instance of the RadXmlHttpPanel control firing the event.

  2. An eventArgs parameter containing the following properties and methods:

    1. set_cancel lets you prevent from loading the content inside the RadXmlHttpPanel and raising the OnClientResponseEnded client-side event.

    2. get_cancel returns a boolean value indicating whether the RadXmlHttpPanel’s content update was canceled.

    3. get_content gets the HTML content rendered inside the RadXmlHttpPanel.

The following example demonstrates how you can cancel the loading of the content inside the RadXmlHttpPanel. An event handler should be provided for the OnClientResponseEnding client-side event where the action can be canceled by using the cancel property of the eventArgs passed to the handler

function SetValue()
    var panel = $find("<%= RadXmlHttpPanel1.ClientID %>");
    var value = "some_value";
function OnClientResponseEnding(panel, args)
    var result = confirm("Do not load the content in the XmlPanel?");
<input type="button" value="Refresh RadXmlHttpPanel1" onclick="SetValue()" />
<telerik:RadXmlHttpPanel ID="RadXmlHttpPanel1" runat="server" OnServiceRequest=" RadXmlHttpPanel1_ServiceRequest"
    <telerik:RadGrid RenderMode="Lightweight" ID="RadGrid1" RegisterWithScriptManager="false" ID="RadGridTeamPlayer"
        runat="server" AllowSorting="False" AutoGenerateColumns="True" GridLines="Both"
        Height="100%" ShowFooter="false" Style="border: solid 1px black; outline: 0">
                <telerik:GridBoundColumn DataField="username" HeaderText="Player" SortExpression="username">
                    <ItemStyle HorizontalAlign="center" />
                    <HeaderStyle HorizontalAlign="center" />
protected void RadXmlHttpPanel1_ServiceRequest(object sender, Telerik.Web.UI.RadXmlHttpPanelEventArgs e)
    string val = e.Value; BindGrid(val);
void BindGrid(string parametervalue)
    RadGrid1.DataSource = new string[] { "1", "2", DateTime.Now.ToLongTimeString() };
Protected Sub RadXmlHttpPanel1_ServiceRequest(ByVal sender As Object, ByVal e As RadXmlHttpPanelEventArgs)
    Dim val As String = e.Value
End Sub

Sub BindGrid(ByVal parametervalue As String)
    RadGrid1.DataSource = New String() {"1", "2", DateTime.Now.ToLongTimeString()}
End Sub
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