Movie Clip became null after perform drag and drop matching an object game

[zsqrd34964785]

After drag and drop matching an object, the movie clip is not allowed to be used again when user click on "play again" button.

For example, after a user match a MC with an object, if successful will go to next scene and continue playing...

When user matching wrong pattern and back to the main scene and start to play again, the MC will became null property and not able to be used again, result will always return false.

How can i fix this problem? Any suggestion?

[kglad · Accepted solution]

that's usually caused by changing frames and, at some point, that movieclip has been removed from the timeline.  even though it's re-added, it's no longer the same object and therefore no longer continues to have the same reference.

the only way to ensure that's not occurring is to use code to add and remove your object from the display or to add it using the ide and never remove it for as long as you want to continue using the same reference.  it doesn't need to be visible, but it needs to exist.

[zsqrd34964785]

how do i add and remove my object? by using add child and remove child?

[kglad]

addChild() and removeChild() is one way to add an remove display objects.  and because the objects continue to exist (even when removed and not displayed) that will probably eliminate your replay problem.

[zsqrd34964785]

I am doing it this way, but not working also.

var answer:Circle = new Circle();

answer.x = 50;

answer.y=50;

addChild(answer);

answer.addEventListener(MouseEvent.MOUSE_DOWN, fl_ClickToDrag_4);

function fl_ClickToDrag_4(event:MouseEvent):void

{

    answer.startDrag();

}

stage.addEventListener(MouseEvent.MOUSE_UP, fl_ReleaseToDrop_4);

function fl_ReleaseToDrop_4(event:MouseEvent):void

{

    if (answer.hitTestObject(b15)){

            MovieClip(this.root).gotoAndPlay(1, "Scene 7");

        }

    else{

            MovieClip(this.root).gotoAndPlay(1, "Scene 4");

        }

        removeChild(answer);

}

[kglad]

what's b15?

that looks like a potential problem if that frame is replayed.

[zsqrd34964785]

It is a shape which need match/hit by the answer.

[kglad]

is it ever removed from the timeline?

[zsqrd34964785]

how to see whether it is removed from timeline or not?

[kglad]

everytime you return to that frame is b15 defined?  (eg, not null?)

[zsqrd34964785]

yes,

[zsqrd34964785]

Every movie cllip object need to use Add and Remove child method if want to replayable?

If that so, i think i know where the problem is.

[kglad]

not necessarily, but it does prevent a common problem with replays.