OnPopupOpening

The OnPopupOpening client-side event handler is called just before a popup calendar is initialized to the current selection in the input area and then displayed.

The event handler receives two arguments:

1. the object that fired the event.

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

Name	Return Type	Arguments	Description
get_popupControl()	RadCalendar client-side object		Returns the client object for the time view or calendar 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:RadDatePicker RenderMode="Lightweight" ID="RadDatePicker1" runat="server">
    <Calendar DayNameFormat="FirstLetter"
           UseColumnHeadersAsSelectors="False"
           UseRowHeadersAsSelectors="False">
    </Calendar>
    <ClientEvents OnPopupOpening="popupOpening" />
</telerik:RadDatePicker>

function popupOpening(sender, eventArgs) {
    if (sender.isEmpty()) {
        eventArgs.set_cancelCalendarSynchronization(true);

        var popup = eventArgs.get_popupControl();
        var todaysDate;
        var todayTriplet;

        if (popup.get_selectedDates().length == 0) {
            todaysDate = new Date();
            todayTriplet = [todaysDate.getFullYear(), todaysDate.getMonth() + 1, todaysDate.getDate()];
            popup.selectDate(todayTriplet, true);
        }
    }
}

See Also

• Client-side Events Overview

• OnPopupClosing