Adds an in-process callback function to an existing EventListener.
this |
The EventListener to register against an event type. |
event_type |
a character string indicating the type of events for which notification is requested. See register for a description of the format and legal event types. |
properties |
a list of properties that should be sent along with the event. The properties are valued for the duration of the event callback. TODO: Document. |
|