The clicking event occurs when the RadCheckBox control is clicked, immediately after the mouse button is released. The event is fired after the client-side validation occurs, and can be canceled.

The event handler receives two parameters:

  1. The instance of the clicked RadCheckBox control.

  2. An eventArgs parameter of type Telerik.Web.UI.ButtonCancelEventArgs, containing the following properties and methods:

    • get_cancel() - returns a bool value that indicates whether the event was canceled. True means the event is canceled.

    • set_cancel(shouldCancel) - sets a bool value that indicates whether the event will be canceled. Setting true means the event will be canceled.

    • get_commandName() - returns the value assigned to the RadCheckBox's CommandName property.

    • get_commandArgument() - returns the value assigned to the RadCheckBox's CommandArgument property.

This event comes handy in scenarios when the user wants to cancel the page submission, or prevent execution of the other client-side events based on a certain condition. One such scenario is confirming the submission of the page to the server. We ask the user if she wants to submit the page, and if a negative answer is received, we cancel the clicking event. Here is the code:

Example 1: Handling OnClientClicking event in RadCheckBox.

<script type="text/javascript">
    function Clicking(sender, args)
        args.set_cancel(!window.confirm("Are you sure?"));
<telerik:RadCheckBox ID="RadCheckBox1" runat="server" OnClientClicking="Clicking" OnClick="RadCheckBox1_Click">
protected void RadCheckBox1_Click(object sender, System.EventArgs e)
    RadCheckBox1.Text = "RadCheckBox was clicked at: " + DateTime.Now.ToString();
Protected Sub RadCheckBox1_Click(ByVal sender As Object, ByVal e As System.EventArgs)
    RadCheckBox1.Text = "RadCheckBox was clicked at: " + DateTime.Now.ToString
End Sub

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