# Events Overview

**RadScheduler** has a number of properties which value is the name of a JavaScript function that executes when specific client-side events occur. These events are listed below:

* **[OnClientAppointmentClick](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientappointmentclick)** - occurs when the user clicks an appointment.

* **[OnClientAppointmentDoubleClick](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientappointmentdoubleclick)** - occurs when the user double-clicks an appointment.

* **[OnClientAppointmentDeleting](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientappointmentdeleting)** - occurs when the user tries to delete an appointment.

* **[OnClientAppointmentEditing](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientappointmentediting)** - occurs immediately before an appointment is edited.

* **[OnClientAppointmentInserting](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientappointmentinserting)** - occurs before an appointment is inserted.

* [OnClientAppointmentMoveStart](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientappointmentmovestart) - occurs when the user starts to move an appointment.

* [OnClientAppointmentMoving](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientappointmentmoving) - occurs as the user is moving an appointment.

* [OnClientAppointmentMoveEnd](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientappointmentmoveend) - occurs when the user stops moving an appointment.

* **[OnClientAppointmentResizeStart](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientappointmentresizestart)** - occurs when the user starts resizing an appointment.

* **[OnClientAppointmentResizing](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientappointmentresizing)** - occurs when the user moves the mouse while resizing an appointment.

* **[OnClientAppointmentResizeEnd](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientappointmentresizeend)** - occurs when the user releases the mouse after resizing an appointment.

* **[OnClientAppointmentContextMenu](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientappointmentcontextmenu)** - occurs when the user right-clicks on an appointment.

* [OnClientNavigationCommand](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientnavigationcommand) - occurs when the scheduler is about to execute a navigation command.

* [OnClientNavigationComplete](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientnavigationcomplete) - occurs when a navigation command has been completed.

* [OnClientRecurrenceActionDialogShowing](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientrecurrenceactiondialogshowing) - occurs just before the dialog appears to ask whether the change the user just started on a recurring appointment is to affect the appointment itself or the entire series.

* **[OnClientRecurrenceActionDialogClosed](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientrecurrenceactiondialogclosed)** - occurs when the dialog that asks whether a change affects a single occurrence or an entire series closes.

* **[OnClientTimeSlotClick](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclienttimeslotclick)** - occurs when the user clicks on a time slot in the scheduler.

* **[OnClientTimeSlotContextMenu](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclienttimeslotcontextmenu)** - occurs when the user right-clicks on a time slot in the scheduler.

* **[OnClientFormCreated](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientformcreated)** - occurs when an in-line editor or edit form is about to appear.

Web Service binding specific events:

* **[OnClientAppointmentsPopulating](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientappointmentspopulating)** - occurs when the scheduler is about to request appointments.

* **[OnClientAppointmentsPopulated](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientappointmentspopulated)** - occurs when the scheduler has received appointments from the Web Service.

* **[OnClientAppointmentDataBound](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientappointmentdatabound)** - occurs when an appointment is received and is about to be rendered.

* [OnClientAppointmentSerialized](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientappointmentserialized) - allows you to populate appointments with custom data before sending them to the Web Service

* **[OnClientAppointmentCreated](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientappointmentcreated)** - occurs when an appointment is received and has been rendered.

* **[OnClientResourcesPopulating](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientresourcespopulating)** - occurs when the scheduler is about to request resources.

* **[OnClientResourcesPopulated](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientresourcespopulated)** - occurs when the scheduler has received resources.

* **[OnClientDataBound](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientdatabound)** - occurs when the scheduler has been populated with data.

* **[OnClientRequestFailed](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientrequestfailed)** - occurs when a request to the Web Service has failed.

* **[OnClientRequestSuccess](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientrequestsuccess)** -occurs when when a request to the Web Service has succeeded.

* **[OnClientAppointmentWebServiceInserting](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientappointmentwebserviceinserting)** - occurs when an appointment is about to be stored via Web Service call.

* **[OnClientAppointmentWebServiceDeleting](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientappointmentwebservicedeleting)** - occurs when an appointment is about to be deleted via Web Service call.

* **[OnClientAppointmentWebServiceUpdating](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientappointmentwebserviceupdating)** - occurs when an appointment is about to be updated via Web Service call.

* **[OnClientRecurrenceExceptionCreating](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientrecurrenceexceptioncreating)** - occurs when a recurrence exception is about to be created via Web Service call.

* **[OnClientRecurrenceExceptionsRemoving](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientrecurrenceexceptionsremoving)** - occurs when recurrence exceptions are about to be removed via Web Service call.

Reminder related events:

* [OnClientReminderTriggering](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientremindertriggering) -occurs when an appointment reminder is due and is about to be triggered.

* [OnClientReminderSnoozing ](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientremindersnoozing-) - occurs when an appointment reminder is due and is about to be snoozed.

* [OnClientReminderDismissing ](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/client-side-programming/events/onclientreminderdismissing-) - occurs when an appointment reminder is due and is about to be dismissed.

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 **RadScheduler** property.

```JavaScript
	     
<script type="text/javascript">   
  function OnClientAppointmentInserting(sender, eventArgs)
  {
	 var now = new Date();
	 if (eventArgs.get_startTime() < now)
		 eventArgs.set_cancel(true);
  }
</script>
	
	// #region client-side-programming-events_1
	
function onClickHandler1()
{
	alert("First handler occurs");
}
function onClickHandler2()
{
	alert("Second handler occurs");
}
function pageLoad()
{
	 var Scheduler = $find("<%= RadScheduler1.ClientID %>");
	 
	 Scheduler.add_timeSlotClick(OnClickHandler1);
	 Scheduler.add_timeSlotClick(OnClickHandler2);
}      
	
```

You can also assign event handlers in client-side code. When using the client-side API, pass a reference to the event handler rather than its name. One advantage of using the client-side API is that you can attach multiple event handlers to one event using the standard MS AJAX convention:

```JavaScript
	
function onClickHandler1()
{
	alert("First handler occurs");
}
function onClickHandler2()
{
	alert("Second handler occurs");
}
function pageLoad()
{
	 var Scheduler = $find("<%= RadScheduler1.ClientID %>");
	 
	 Scheduler.add_timeSlotClick(OnClickHandler1);
	 Scheduler.add_timeSlotClick(OnClickHandler2);
}      
	
```

Another advantage of the client-side API is that you can detach an event handler dynamically:

```JavaScript
	
function removeOnClick2()
{
	 var Scheduler = $find("<%= RadScheduler1.ClientID %>");
	 Scheduler.remove_timeSlotClick(OnClickHandler2);
}       
	
```

Note that on the client-side, the names of events are slightly different than on the server-side. The following table shows the correspondence between client-side and server-side names:

| Server-Side Name                       | Client-Side Name               | Methods to Add and Remove                                                 |
| -------------------------------------- | ------------------------------ | ------------------------------------------------------------------------- |
| OnClientAppointmentClick               | appointmentClick               | add_appointmentClick, remove_appointmentClick                             |
| OnClientAppointmentDoubleClick         | appointmentDoubleClick         | add_appointmentDoubleClick, remove_appointmentDoubleClick                 |
| OnClientAppointmentDeleteing           | appointmentDeleting            | add_appointmentDeleting, remove_appointmentDeleting                       |
| OnClientAppointmentEditing             | appointmentEditing             | add_appointmentEditing, remove_appointmentEditing                         |
| OnClientAppointmentInserting           | appointmentInserting           | add_appointmentInserting, remove_appointmentInserting                     |
| OnClientAppointmentMoveStart           | appointmentMoveStart           | add_appointmentMoveStart, remove_appointmentMoveStart                     |
| OnClientAppointmentMoving              | appointmentMoving              | add_appointmentMoving, remove_appointmentMoving                           |
| OnClientAppointmentMoveEnd             | appointmentMoveEnd             | add_appointmentMoveEnd, remove_appointmentMoveEnd                         |
| OnClientAppointmentResizeStart         | appointmentResizeStart         | add_appointmentResizeStart, remove_appointmentResizeStart                 |
| OnClientAppointmentResizing            | appointmentResizing            | add_appointmentResizing, remove_appointmentResizing                       |
| OnClientAppointmentResizeEnd           | appointmentResizeEnd           | add_appointmentResizeEnd, remove_appointmentResizeEnd                     |
| OnClientAppointmentContextMenu         | appointmentContextMenu         | add_appointmentContextMenu, remove_appointmentContextMenu                 |
| OnClientTimeSlotClick                  | timeSlotClick                  | add_timeSlotClick, remove_timeSlotClick                                   |
| OnClientTimeSlotContextMenu            | timeSlotContextMenu            | add_timeSlotContextMenu, remove_timeSlotContextMenu                       |
| OnClientRecurrenceActionDialogShowing  | recurrenceActionDialogShowing  | add_recurrenceActionDialogShowing, remove_recurrenceActionDialogShowing   |
| OnClientRecurrenceActionDialogClosed   | recurrenceActionDialogClosed   | add_recurrenceActionDialogClosed, remove_recurrenceActionDialogClosed     |
| OnClientFormCreated                    | formCreated                    | add_formCreated, remove_formCreated                                       |
| OnClientAppointmentsPopulating         | appointmentsPopulating         | add_appointmentsPopulating, remove_appointmentsPopulating                 |
| OnClientAppointmentsPopulated          | appointmentsPopulated          | add_appointmentsPopulated, remove_appointmentsPopulated                   |
| OnClientAppointmentDataBound           | appointmentDataBound           | add_appointmentDataBound, remove_appointmentDataBound                     |
| OnClientAppointmentCreated             | appointmentCreated             | add_appointmentCreated, remove_appointmentCreated                         |
| OnClientResourcesPopulating            | resourcesPopulating            | add_resourcesPopulating, remove_resourcesPopulating                       |
| OnClientResourcesPopulated             | resourcesPopulated             | add_resourcesPopulated, remove_resourcesPopulated                         |
| OnClientDataBound                      | dataBound                      | add_dataBound, remove_dataBound                                           |
| OnClientRequestFailed                  | requestFailed                  | add_requestFailed, remove_requestFailed                                   |
| OnClientAppointmentWebServiceInserting | appointmentWebServiceInserting | add_appointmentWebServiceInserting, remove_appointmentWebServiceInserting |
| OnClientAppointmentWebServiceDeleting  | appointmentWebServiceDeleting  | add_appointmentWebServiceDeleting, remove_appointmentWebServiceDeleting   |
| OnClientAppointmentWebServiceUpdating  | appointmentWebServiceUpdating  | add_appointmentWebServiceUpdating, remove_appointmentWebServiceUpdating   |
| OnClientRecurrenceExceptionCreating    | recurrenceExceptionCreating    | add_recurrenceExceptionCreating, remove_recurrenceExceptionCreating       |
| OnClientRecurrenceExceptionsRemoving   | recurrenceExceptionsRemoving   | add_recurrenceExceptionsRemoving, remove_recurrenceExceptionsRemoving     |

## See Also

* [Overview](https://www.telerik.com/products/aspnet-ajax/documentation/controls/scheduler/server-side-programming/server-events/overview)