AJAX Support Overview
This is a legacy report viewer and for new projects our recommendation is to use the latest WebForms Report Viewer - HTML5 Web Forms Report Viewer
The main idea of Ajax requests is the elimination of full-page postbacks. In contrast, only the relevant parts of the page are updated, without a disturbing refresh. The markup that is transferred between the client machine and the server is reduced dramatically, which results in a significant performance improvement.
The Web ReportViewer can work both Telerik RadAjax and the native ASP.NET AJAX frameworks. Generally, you do not have to apply ajax for the Web ReportViewer itself as all its commands are issued through an http handler and update only the report/report parameters areas and not the entire page.
So when might you need to use ajax in conjunction with the web report viewer? A valid case is when you want to change the Report on another control action e.g. button click.
Issue Ajax Request through Telerik RadAjaxManager
Add the instance of the ReportViewer to a RadAjaxManager control. You can optionally provide it with a loading panel, as shown below:
<asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />
<telerik:ReportViewer ID="ReportViewer1" runat="server"></telerik:ReportViewer>
<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">
<AjaxSettings>
<telerik:AjaxSetting AjaxControlID="Button1">
<UpdatedControls>
<telerik:AjaxUpdatedControl ControlID="ReportViewer1"/>
</UpdatedControls>
</telerik:AjaxSetting>
</AjaxSettings>
</telerik:RadAjaxManager>
protected void Button1_Click(object sender, EventArgs e)
{
var typeReportSource = new Telerik.Reporting.TypeReportSource();
typeReportSource.TypeName = "Telerik.Reporting.Examples.CSharp.ListBoundReport, CSharp.ReportLibrary";
this.ReportViewer1.ReportSource = typeReportSource;
}
Protected Sub Button1_Click(sender As Object, e As EventArgs)
Dim typeReportSource As New Telerik.Reporting.TypeReportSource()
typeReportSource.TypeName = "ListBoundReport, VB.ReportLibrary"
ReportViewer1.ReportSource = typeReportSource
End Sub
Issue Ajax Request through ASP.NET AJAX UpdatePanel
Wrap the instance of the ReportViewer into an UpdatePanel ContentTemplate:
<asp:ScriptManager ID="ScriptManager1" runat="server" />
<asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Button1" />
</Triggers>
<ContentTemplate>
<telerik:ReportViewer ID="ReportViewer1" runat="server">
</telerik:ReportViewer>
</ContentTemplate>
</asp:UpdatePanel>
protected void Button1_Click(object sender, EventArgs e)
{
var typeReportSource = new Telerik.Reporting.TypeReportSource();
typeReportSource.TypeName = "Telerik.Reporting.Examples.CSharp.ListBoundReport, CSharp.ReportLibrary";
this.ReportViewer1.ReportSource = typeReportSource;
}
Protected Sub Button1_Click(sender As Object, e As EventArgs)
Dim typeReportSource As New Telerik.Reporting.TypeReportSource()
typeReportSource.TypeName = "ListBoundReport, VB.ReportLibrary"
ReportViewer1.ReportSource = typeReportSource
End Sub