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The OnClientClose event fires when the RadWindow closes. You can use the event to pass data from the dialog page.It is subsequent to the OnClientBeforeClose event.The close operation can be initiated from the user by clicking or tapping on the manual close button (X) in the top right-hand side corner of the title bar, or by the developer via calling the close(optionalArguments) client-side method of the control(e.g., through a custom Close button in the content (Example 2)).

You can use this event to return data from the dialog page and to create parent-child relationships with other RadWindow instances.

The event handler receives the following arguments:

  1. The RadWindow object that fired the event.

  2. An event arguments object that exposes the following methods:

Name Parameters Return Type Description
get_argument object This is the argument passed to the close() method of the RadWindow by the developer.

To see how to get a reference to the RadWindow client-side object, examine the Client-side Basics help article.

Example 1: Getting data passed from the dialog page (Example 2).

<asp:Button ID="Button2" Text="show the dialog" runat="server" />
<telerik:RadWindow RenderMode="Lightweight" runat="server" ID="RadWindow1" OnClientClose="OnClientCloseHandler" NavigateUrl="dialog-page.aspx" VisibleOnPageLoad="true"></telerik:RadWindow>
<script type="text/javascript">
    function OnClientCloseHandler(sender, args) {
        var data = args.get_argument();
        if (data) {

Example 2: Passing data that can be consumed by the parent page (Example 1).

<asp:Button ID="Button3" Text="clpse the dialog" OnClientClick="closeAndPassData(); return false;" runat="server" />
<script type="text/javascript">
    function closeAndPassData() {
        var data = "some information"; //this can be a complex object obtained according to the project logic
        var wnd = GetRadWindow();
        if (wnd) {

    function GetRadWindow() {
        var oWindow = null;
        if (window.radWindow) oWindow = window.radWindow;
        else if (window.frameElement.radWindow) oWindow = window.frameElement.radWindow;
        return oWindow;

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