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Client Confirmation and AJAX

You may need to provide a confirmation dialog to the user and initiate an AJAX request if accepted. Confirmation using standard postbacks often look like this:

<asp:ImageButton ID="ImageButton1" runat="server" OnClientClick="return confirm('Are you sure?');" />

The OnClientClick should be changed a bit to work with AJAX when the button is AJAX-enabled by added the necessaryAJAX setting to RadAjaxManager or when the button is placed within a RadAjaxPanel control.

<asp:ImageButton ID="ImageButton2" runat="server" OnClientClick="if (!confirm('Are you sure?')) return false;" />

Alternatively, you can use the OnRequestStart client-side event to implement more complex logic.Example 1 shows a sample script.

Example 1: Displays confirmation message by using OnRequestStart client-side event.

<telerik:RadCodeBlock ID="RadCodeBlock1" runat="server">
<script type="text/javascript">
            function OnRequestStart(ajaxControl, eventArgs) {
                var eventTarget = eventArgs.get_eventTarget(); 
                if (eventTarget == "<%= ImageButton1.UniqueID %>") {
                    return confirm('Are you sure?');
                else {
                    return false;

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