# OnInit

The **OnInit** client-side event handler of the [ASP NET AJAX Calendar](https://www.telerik.com/products/aspnet-ajax/calendar.aspx) is called when the calendar is first constructed.

The event handler receives one argument:

1. the [RadCalendar object](https://www.telerik.com/products/aspnet-ajax/documentation/controls/calendar/client-side-programming/radcalendar-object) that fired the event.

The following example uses the **OnInit** event to initialize the selection to today's date:

```ASPNET
<telerik:RadCalendar RenderMode="Lightweight" ID="RadCalendar1" runat="server" >
    <ClientEvents OnInit="initializeCalendar" />
</telerik:RadCalendar>
```

```JavaScript
function initializeCalendar(sender) {
	var todaysDate = new Date();
	var todayTriplet = [todaysDate.getFullYear(), todaysDate.getMonth() + 1, todaysDate.getDate()];
	
	sender.selectDate(todayTriplet, true);
}
```

## See Also

* [OnLoad](https://www.telerik.com/products/aspnet-ajax/documentation/controls/calendar/client-side-programming/events/onload)