Add a handler to be notified when the event occurs.
"navigationEvent_var" is a variable referencing a NavigationEvent object. |
"navigationEvent_var" is a variable referencing a NavigationEvent object. |
| Type | Description |
| boolean | Returns true if the addition of the handler was successful. |
| Name | Type | Description |
| handler | NavigationEventHandler | The handler object to be called when this event is fired. |