The OnPopupClosing client-side event handler is called just before a popup calendar is closed.

The OnPopupClosing event is supported by: RadDatePicker , RadTimePicker , and RadDateTimePicker .

The event handler receives two arguments:

  1. the object that fired the event.

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

Name Return Type Arguments Description
get_popupControl() Calendar client-side object Returns the client object for the time view or calendar that is about to close.
set_cancel(value) bool Lets you prevent the popup from closing.

The following example uses the OnPopupClosing event to prevent the popup from closing if nothing is selected:

<telerik:RadDatePicker RenderMode="Lightweight" ID="RadDatePicker1" runat="server">
    <Calendar DayNameFormat="FirstLetter"
    <ClientEvents OnPopupClosing="popupClosing" />
function popupClosing(sender, eventArgs) {
    var popup = eventArgs.get_popupControl();

    if (popup.get_selectedDates().length == 0) {
        alert("You must select a date!");

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