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Client-side Events Overview

The RadCalendar controls support a number of client-side events that let you respond to user actions without a postback. The following table lists the various client events, and which controls they apply to:

Event Description
OnDateSelected Occurs immediately after the value of the control's selection has been changed.
OnPopupOpening Occurs immediately before a popup is displayed, before the selection in the popup is synchronized with the input area.
OnPopupClosing Occurs immediately before the a popup is closed.

The embedded RadDateInput object that is used by RadDateTimePicker also has a number of client events. See the RadInput documentation for details.

To use these events, simply write a JavaScript function that can be called when the event occurs. Then assign the name of the JavaScript function as the value of the the corresponding property.

<telerik:RadDateTimePicker RenderMode="Lightweight" ID="RadDateTimePicker1" runat="server">
    <ClientEvents OnPopupOpening="popupOpening" />
function popupOpening(sender, args) {
    alert("popup is opening");

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