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OnClientClicking (clicking client-side event)

The clicking event occurs when the RadButton 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 RadButton control

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

    • IsSplitButtonClick() - returns a bool value that indicates whether the split button or the main button is clicked. True means the split button was clicked.

    • 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 RadButton's CommandName property

    • get_commandArgument() - returns the value assigned to the RadButton'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:

<script type="text/javascript">
    function Clicking(sender, args)
        args.set_cancel(!window.confirm("Are you sure you want to submit the page?"));
<telerik:RadButton RenderMode="Lightweight" ID="RadButton1" runat="server" Text="Submit"    OnClientClicking="Clicking" OnClick="RadButton1_Click">
protected void RadButton1_Click(object sender, System.EventArgs e)
    RadButton1.Text = "RadButton was clicked at: " + DateTime.Now.ToString();
Protected Sub RadButton1_Click(ByVal sender As Object, ByVal e As System.EventArgs)
    RadButton1.Text = "RadButton was clicked at: " + DateTime.Now.ToString
End Sub

Since Q2 2012 the event OnClientClicking is raised after the ASP.NET client-side validation on the page takes place. This will handle the problem described in the help article RadButton Validation And Client-side Event Handlers.

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