Events are actions that occur usually as a result of something the user does.
For example, clicking a button is an event, as is changing a text field or moving the mouse over a link. For your script to react to an event, you define event handlers , such as onChange and onClick . Event handling changed significantly between Navigator 3.0 and Navigator 4.0. 1.2 Events in the online View Source magazine. In addition, the JavaScript technical notes contain information on programming events.