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AjaxManager Client-side APIs Overview

Overview of the Client-side APIs exposed by the Telerik Web Forms AjaxManager component.

Check out the online demo at Client-side API demo.

Get client-side reference

Depending on the JS coding style and libraries you use, there are different ways to get reference to the Telerik.Web.UI.RadAjaxManager Object.


function myFunction(arguments) {
    // Using the $find() method
    var ajaxManager1 = $find("<%= RadAjaxManager1.ClientID %>");

    // Using the $telerik.findControl() method
    var ajaxManager2 = $telerik.fondControl(document, 'RadAjaxManager1');
    // OR 
    var ajaxManager3 = $telerik.fondControl(document, '<%= RadAjaxManager.UniqueID %>');

    // Using jQuery
    var ajaxManager4 = $('[id$=RadAjaxManager1]')[0].control;

    // Using document.querySelector()
    var ajaxManager5 = document.querySelector('[id$=RadAjaxManager1]').control;

    // Using document.getElementById()
    var ajaxManager6 = document.getElementById('<%= RadAjaxManager.ClientID %>').control;


Name Parameters Return Type Description
get_ajaxSettings() none array of objects Returns an array of settings where each object has properties for the InitControlID and another array of UpdatedControls.
set_ajaxSettings() array of objects none Sets the array of objects representing the AjaxSettings.
get_defaultLoadingPanelID() none string Returns the DefaultLoadingPanelID.
set_defaultLoadingPanelID() string none Sets the DefaultLoadingPanelID.
get_enableAJAX() none boolean true if AJAX is enabled.
set_enableAJAX() boolean none Enables or disable AJAX for the AJAX initiator. Pass true to enable AJAX, or false to have the subsequent requests performed as standard postbacks.
get_enableHistory() none boolean true if the browser history is enabled during AJAX requests.
set_enableHistory() boolean none Allows the browser history during AJAX requests. Pass true to allow browser history during AJAX requests.


Name Parameters Return Type Description
ajaxRequest() string none Initiates an AJAX request that fires the AjaxRequest event on the server.
ajaxRequestWithTarget() string, string none Simulates a PostBack/AJAX request initiated from a control with a specified UniqueID.


The AjaxManager and the AjaxPanel both descend from the RadAjaxControl instance.

The RadAjaxControl introduces the AjaxClientEvents property that contains the following events

Name Description
RequestStart The RequestStart client-side event handler is called when a request to the server is started.
ResponseEnd The ResponseEnd client-side event handler is called when a request is received from the server. The event can not be cancelled.

To use these events, write a JavaScript function that can be called when the event occurs. Then, assign the name of the JavaScript function as the value for the corresponding event.


<script type="text/javascript">
    function requestStart(sender, eventArgs) {
        alert('Request start');
    function responseEnd(sender, eventArgs) {
        alert('Response complete');
<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">
    <ClientEvents OnRequestStart="requestStart" OnResponseEnd="responseEnd" />


The AjaxManager and AjaxPanel requires all <script> elements that contain ASP.NET inline expressions to be wrapped inside RadCodeBlock or RadScriptBlock containers.


<telerik:RadScriptBlock ID="RadScriptBlock1" runat="server">
        function InitiateAjaxRequest(arguments) {
            // ASP.NET Inline expression referencing the AjaxManager
            var ajaxManager = $find("<%= RadAjaxManager1.ClientID %>");

            // ASP.NET Inline expression getting the current date from the server
            var currentDate = "<%= DateTime.Now.ToString() %>";

When an AJAX request is triggered using ajaxRequest() method, the event initiator is the AjaxManager itself and it has to be set as the AjaxControl updating the corresponding control.


<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server" OnAjaxRequest="RadAjaxManager1_AjaxRequest">
        <telerik:AjaxSetting AjaxControlID="RadAjaxManager1">
                <telerik:AjaxUpdatedControl ControlID="Label1" />

<telerik:RadTextBox ID="RadTextBox1" runat="server"></telerik:RadTextBox>
<telerik:RadButton runat="server" ID="RadButton1" Text="Update Label With TextBox Value" AutoPostBack="false" OnClientClicked="makeAjaxRequest" />
<asp:Label ID="Label1" runat="server"></asp:Label>

<telerik:RadScriptBlock ID="RadScriptBlock1" runat="server">
        function makeAjaxRequest(sender, args) {
            // Access the textbox
            var radTextBox = $find("<%= RadTextBox1.ClientID %>");

            // Get the Textbox text
            var text = radTextBox.get_value();

            // Access the AjaxManager
            var ajaxManager = $find("<%= RadAjaxManager1.ClientID %>");

            // Make an AJAX request and pass along the text as argument
protected void RadAjaxManager1_AjaxRequest(object sender, Telerik.Web.UI.AjaxRequestEventArgs e)
    if (string.IsNullOrEmpty(e.Argument)) return;

    Label1.Text += string.Format("RadTextBox Value: {0}</br>", e.Argument);
Protected Sub RadAjaxManager1_AjaxRequest(ByVal sender As Object, ByVal e As Telerik.Web.UI.AjaxRequestEventArgs)
    If String.IsNullOrEmpty(e.Argument) Then Return

    Label1.Text &= String.Format("RadTextBox Value: {0}</br>", e.Argument)
End Sub

See Also

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