Code Problem or Bug?

Question

I have a problem that seems simple to the core.  I can easily duplicate it and I am not sure why it's happening.  Here's the steps:
1. Drag a button to the stage and give it an instance name (btnHello).
2. Create a new layer (for Actions).
3. On frame 1 (of the Actions layer), put in the following code:
     btnHello.addEventListener(MouseEvent.MOUSE_UP, goHello);
     function goHello(event:MouseEvent):void{
     gotoAndPlay(5);
     stop();
4. On frame 5, put in the following code:
     trace("Frame 5");
     stop();
5. On frame 10, put in the following code:
     trace("Frame 10");
     stop();
Pretty straight-forward.  It is a button that is hard coded to go to Frame 5 when clicked, which it does do.  However, if I am already on Frame 5 when I click it, it jumps to Frame 10.  If I click it again, it junmps back to Frame 5, click again, Frame 10.
This is causing some serious issues with my navigation / flow.  Does anyone know why it's happening and what I can do to preevent it?
Thanks.
Dave

Answer 1

I tested this to know for sure my inclination was correct.
When you are on frame 5, and you call a gotoAndPlay(5); - you are essentially just telling the playhead to play, since its already on that frame.  So, what happens is it goes to frame 6, where there are no stop actions, plays through to 10, and fires that trace and stop().
You can do one of two things.
1. Use gotoAndStop(5) instead of gotoAndPlay - which will only fire the trace once, since the playhead won't leave the frame if you are already on it.  But it will fix your jumping issue.
2. Check the current frame and only call the gotoAndPlay if you are not on that frame.
     function goHello(event:MouseEvent):void{
          if(currentFrame != 5){
               gotoAndPlay(5);
          }else{
               trace("Frame 5 again");