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The OnPopupOpening client-side event handler is called immediately before a popup time view is displayed.

The event handler receives two arguments:

  1. the object that fired the event.

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

Name Return Type Arguments Description
get_popupControl() Time view client object Returns the client object for the time view that is about to be displayed.
set_cancelCalendarSynchronization(value) bool Lets you prevent the popup control from synchronizing its value to the value in the input area.
set_cancel(value) bool Lets you prevent the popup from appearing.

The following example uses the OnPopupOpening event to initialize the selection if the input area is empty:

<telerik:RadTimePicker RenderMode="Lightweight" ID="RadTimePicker1" runat="server">
    <ClientEvents OnPopupOpening="popupOpening" />
function popupOpening(sender, eventArgs) {
    var popup = eventArgs.get_popupControl();
    var time = popup.getTime();;

    if (!time) {
        time = new Date();

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