OnCalendarViewChanging

The OnCalendarViewChanging client-side event handler of the ASP NET AJAX Calendar is called when the calendar navigates to a new view, before the viewable area rendered by the calendar is changed.

The event handler receives two arguments:

1. the RadCalendar object that fired the event.

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

Name	Return Type	Arguments	Description
get_step()	int		Returns the number of views by which the calendar is about to change.
set_cancel(value)		bool	Lets you prevent the view from changing.

This event can be used to pre-process some conditions or visual styles and content before the final rendering of the calendar. The following example uses the OnCalendarViewChanging event to prevent the view from changing unless a date in the current month is selected:

ASPNET

<telerik:RadCalendar RenderMode="Lightweight" ID="RadCalendar1" runat="server" ShowOtherMonthsDays="False" >
	<ClientEvents OnCalendarViewChanging="checkSelections" />
</telerik:RadCalendar>

JavaScript

function checkSelections(sender, eventArgs) {
    var selDates = sender.get_selectedDates();
    var focus = sender.get_focusedDate();
    var viewHasSelection = false;
	
    for (var i = 0; i < selDates.length; i++) {
        if ((selDates[i][0] == focus[0]) && (selDates[i][1] == focus[1])) {
			viewHasSelection = true;
		}
    }
	
    eventArgs.set_cancel(!viewHasSelection);
	
    if (eventArgs.get_cancel()) {
    	alert("You must select a value before moving " + (eventArgs.get_step() > 0 ? "forward " : "back ") + "to another month.");
	}
}

See Also

• OnCalendarViewChanged

• DefaultViewChanged