AS3 function running before variables are defined!

Question

I am trying to add an init() function to a MovieClip, but when I run the function from scene1 the variables that were set in the MovieClip are not defined yet... The MovieClip was dragged to the stage from the library.

scene1:

mc.init(null);

MovieClip:

var _default = 5;

function init(num) {
     if(num == null) {
          trace(_default);
     } else {
          trace(num);
     }
}

This is tracing "undefined" instead of "5"; Is there a way of fixing this problem?

Max Dohme · Accepted Answer · 2011-03-06 16:58:51Z

1

The problem is that any code thats placed directly in the main timeline will always run before the code thats directly in the MovieClip.

The way to get around this would be to let flash finish running that code in both timeline and the MovieClip first, and then call the function from the timeline after its done.

The easiest way to do this would be to use an event listener:

Timeline:

addEventListener( Event.ENTER_FRAME, onEnterFrame );

function onEnterFrame( e:Event ):void {
    myObject.init(null);
    removeEventListener( Event.ENTER_FRAME, onEnterFrame );
}

That way the timeline will wait until the first frame has started to call the init function of your MovieClip.

answered Mar 6, 2011 at 16:58

Max Dohme

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