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OnClientCheckedChanged (checkedChanged client-side event)

The checkedChanged event is fired after the Checked property of the RadButton is changed, and is subsequent to the checkedChanging event(OnClientCheckedChanging). The event is triggered only if the ToggleType property is set to [Telerik.Web.UI].ButtonToggleType.CheckBox or ButtonToggleType.Radio i.e. when the control is used as a RadioButton or CheckBox. The user cannot cancel the event.

The event handler receives two parameters:

  1. The instance of the clicked RadButton control

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

    • get_checked() - returns a bool value that indicates whether the button is checked.
    • get_toggleType () - returns the ButtonToggleType of the RadButton. It can be either ButtonToggleType.CheckBox or ButtonToggleType.Radio.
    • 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 is useful when the user wants to execute custom client code when the button changes its checked state. For example, the following code shows a RadWindow control when the button is checked, and hides it when unchecked.

<script type="text/javascript">
    function ShowHideWindow(sender, args)
        var oWnd = $find("<%=RadWindow1.ClientID %>");
        if (args.get_checked())

<telerik:RadButton RenderMode="Lightweight" ID="RadButton1" runat="server" Text="Show/Hide Window" ToggleType="CheckBox"
    ButtonType="ToggleButton" OnClientCheckedChanged="ShowHideWindow" AutoPostBack="false">

<telerik:RadWindow RenderMode="Lightweight" ID="RadWindow1" runat="server" NavigateUrl="">
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