ansaurus

Question

Help - Null Object error when using stage.addEventListener (ScrollBar)

Answer 1

+3 A:

I think your problem is that stage=null. The reason can by only one: you trying to get to stage, when the MC is not added to it (then the reference is null).

Konrad 2009-10-07 17:21:41

Where am I going wrong here?:scroll1 = new ScrollBar(roller1, track1, tab1); container.addChild(sc1); container.addChild(scroll1); container.addChild(bg); container.addChild(nv); addChild(container);

Leon 2009-10-07 17:29:48

Try add event listeners not in constructor but on Event.INIT

Konrad 2009-10-07 17:31:19

I got it! :D thx guys, was scratching my head with where code lines should be placed at...

Leon 2009-10-07 17:58:30

Answer 2

+2 A:

I agree with Konrad, also.. it is better practice to initiate the MOUSE_UP event when the MOUSE_DOWN event is captured.

so move the

stage.addEventListener(MouseEvent.MOUSE_UP, rollerUp);

inside of the rollerDown function.

Preston 2009-10-07 17:29:05

w00t! Yeah that fixed it right up ;)

Leon 2009-10-07 17:59:02

Answer 3

+4 A:

Your stage is null because the newly created object is not yet on the stage. To get around this, use an ADDED_TO_STAGE listener in the constructor which then adds your stage events.

Sean 2009-10-07 17:30:43

Answer 4

A:

thanks,

this fixes the Problem for me.

So add Listener for Mouse_up inside the Mouse_down function and it works.

thanks a lot

AndreasK 2010-04-27 17:43:37

ansaurus

tags:

views:

answers:

Help - Null Object error when using stage.addEventListener (ScrollBar)

related questions