Learning about Events and Handlers

Events and Event Handlers The terms events and event handlers often come up in ActionScript, in fact we have being using

both methods in most of the previous exercises. An ‘‘event’’ is an occurrence that triggers an

action. An event handler is the thing that can handle the event. Events occur independently of the

occurrence of a handler. You need an event to trigger the handler. Events can be grouped into

two categories: time-based and user-based. The most common time-based example is that of the

playhead entering a frame. Every time the playhead moves to a new frame then an event is

generated. All mouse and keyboard activities are described as user events.