flash predefined_symbols_definition_code

In previous versions of ActionScript, the following code definition was possible on instances in the following way:

on (release)
{
trace("clicked");
}

Even if this technique was advised against in large projects, it allowed you to simply attach code to objects. In ActionScript 3 the definition of code is impossible on instances, but it is possible to reproduce the same comportment in ActionScript 3.

By placing the following code on the timeline of a MovieClip we find the same behavior:

// listens to the MouseEvent.CLICK event
addEventListener ( MouseEvent.CLICK, click );
// activation of the button behavior
buttonMode = true;
click function ( pEvt:MouseEvent ):void
{
trace("clicked");
}

We will come back to the buttonMode property in the article entitled Interactivity.