ActionScript 3: using hasEventListener

Published by Grace | Filed under Flash

I’m currently building out an interactive home page for Aviatech in Flash, and came across an issue when one movie clip controls the opacity of others on its roll over Mouse Event, while these “others” also have Mouse Events. Rolling over the “master” movie clip prevents the “others” from having their Mouse Events assigned, so implementing hasEventListener() has saved my project. Here’s a snippet of how I’ve implemented it:

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public function masterSquareRollOver(e:MouseEvent) {
    var s = e.currentTarget;
    //array of related square movieclips
    var parr = s.arr;
    //loop through array and only highlight if 
    //Mouse Events have already been assigned
    if ( parr.length > 0 ) {
        for ( var p in parr ) {
            var proj = _stage.getChildByName(parr[p].name);
            if (proj.hasEventListener(MouseEvent.ROLL_OVER) ) {
                TweenLite.to(proj, .25, {alpha: 1});
            } else { 
            	trace(proj.name+": No event listener, ROLL_OVER disabled");
            }
        }
    }
}

I also came upon this community site where you can post your code and have others review it, or you can look up methods to see how others are implementing it into their code. Take a look at the query results for hasEventListener(). Happy coding!