Question

I’m making a game in AS3. When I add an enemy to the game screen, later on I have to remove it when it dies. But I keep getting this:

[Fault] exception, information=ArgumentError: Error #2025: The supplied DisplayObject must be a child of the caller.

But I clearly add the enemy to the gamescreen. Could this be from passing the enemy through a bunch of functions or something?

Answer 1

When dealing with the timeline, it’s difficult sometimes to keep track of an object’s scope , in which case you can always call the method from the object’s parent property.

     child.parent.removeChild( child );

if you’re coding in FlashDevelop & for some reason , don’t wish to or can’t keep track of the parent , you could implement a couple of methods to add and remove your object from the display list, practically delegating adding & removing to the object…

in your object class , you could do the following…

    private var container:DisplayObjectContainer;

    public function addToDisplayList( container:DisplayObjectContainer ):void
    {
         this.container = container;
         container.addChild( this );
     }

    public function remove():void
    {
         if( container != null )
             container.removeChild( this );
     }

Then you can simply do this:

   var child:MovieClip = new MyObject();
   child.addToDisplayList( whatever );

   //later...
   child.remove();