using addEventListener for Enter and Exit frame

[Arioman]

hi , sometimes i want to set some function in specific frame in start and exit this frame

for example i have Flv player in frame 20 , i have background sound ( mp3 player ) so i want when swf goes to this frame my sound goes Off and when Exit from it and go to another frames the sound played again ...

i put these script in frame 20 :

addEventListener(Event.ENTER_FRAME,enterfunc);
 
function enterfunc(e:Event):void {
    trace("I started");
}
 
 
addEventListener(Event.EXIT_FRAME,exitfunc);
 
function exitfunc(e:Event):void {
    trace("will Exit");
}

but after test movie i see I started and will Exit runs Repeatly without stoping !!

Notice : first i put my sndChannel = soundClip.play; and sndChannel = soundClip.stop;  but my music runs over and over and finally my system Hanged and need to Restart so i use trace to see

so whats a problem ?  thanks for spending time and help me

[kglad]

those probably aren't going to do what you want but, if you wanted each to execute once, remove the event listener.

but again, i doubt that will do what you want.

you probaby want to use an Event.ADDED_TO_STAGE listener and Event.REMOVED_FROM_STAGE listener appied to your flvplayback component to trigger your background music to stop and play:

flv_pb.addEventListener(Event.ADDED_TO_STAGE, addedF);

flv_pb.addEventListener(Event.REMOVED_FROM_STAGE, removedF);

function addedF(e:Event):void{

sndChannel.stop();

}

function removedF(e:Event):void{

sndChannel=soundClip.play();

}

[Arioman]

thanks Kglad .

i will test your tips tomorrow and as i know you i know it will help me as always ...

but just for know can you tell me why addEventListener and Event.EXIT_FRAME or Event.ENTER_FRAME runs repeatly and what script i must use if i want to add function in start or Exit frame at Once ?

cause maybe i want to use this in frames that have not Flv player or any Movieclip with instance name ...

am i forced to put some movieclip in frame and then use Event.ADDED_TO_STAGE and Event.REMOVED_FROM_STAGE script to them always ?!

[kglad · Accepted solution]

because their names are misleading.  Event.EXIT_FRAME doesn't execute once when the playhead exits a frame.  it executes repeatedly.

likewise, Event.ENTER_FRAME doesn't execute once when the playhead enters a frame.  it executes repeatedly.

you can execute a function when the playhead enters a a frame by adding a function call to the frame:

f();  // attached to a frame will call the function f when the playhead enters this frame.  and there are other ways to do this.

you can execute a function when a playhead exists a frame by invalidating the stage and using a render event when a goto is executed:

stage.invalidate();

this.addEventListener(Event.RENDER,exitingF);

this.gotoAndPlay('whatever');

function exitingF(e:Event):void{

// this code executes when this frame is exited and 'whatever' is rendered (=displayed);

}

[Arioman]

thanks Dear Kglad for spending Time for me

your script works well in Enter Frame

but how i must use this for Exit Frame ?  am i must use removeEventListener for this ?

[kglad]

depending on exactly what you want and what's going on in the swf there are better and worse ways to detect what you want.

[Arioman]

sorry , i never wants to bother you , after your Help and Guide i search around Web and maybe for my weak English i cant get what i want ...

i dont need any compilcated fuction or code , i just want to set a simple function ( sound pause ) or Goto Run , rigt after Exit frame ...

[kglad]

after exiting which frame?

and what causes the playhead to exit that frame?

[Arioman]

After Exiting Current Frame

for example i want to :

when Enter Frame No.2 or Frame with Lable "two"

some function run

and when i exit this frame some another Function Runs

i have Stop(); script in frame 2 and i want to use exit script to run function cause i want this script runs with every menus and categories that goes to another Frames

[kglad]

again, for your enter frame question:

you can execute a function when the playhead enters a a frame by adding a function call to the frame:

f();  // attached to a frame will call the function f when the playhead enters this frame.  and there are other ways to do this.

and again, for your exit frame question:

and what causes the playhead to exit that frame?

[Arioman]

so sorry i cant get your Get your point about :  adding a function call to the frame

how can i f();  // attached to a frame will call the function f when the playhead enters this frame ??  

can you explain it simple or with a example script ?

about causes the playhead to exit that frame well there is not only one button to cause exit frame , i have about 5 menus ( about , contact , products , ...  )  and some other buttons and on click on every of them the swf goes to specific Frame and , so i cant set function on every of them ...

For example my frame No2 .

have some Sound Or MOvies and i want when enter this frame Background Sounds Goes off and when i exit This frame ( it may happends with every Menu or Buttons and not only one ) the Background sound Play again

[kglad]

// in frame 1:

function f():void{

trace("function f is executing when the playhead is in frame:", this.currentFrame);

}

// in frame 2:

f();

[Arioman]

kglad wrote:

// in frame 1:

function f():void{

trace("function f is executing when the playhead is in frame:", this.currentFrame);

}

// in frame 2:

f();

This works well For Excute Function on entering Frame Once !! thanks ...

but Only 1 More Question :

as You told me in your No.2 Replay :

I try to add some movieclip with instance name Or FLv playback with instance name and then Try to use this codes :

mymc.addEventListener(Event.ADDED_TO_STAGE, addedF);

function addedF(e:Event):void{

trace("I Start");

}

mymc.addEventListener(Event.REMOVED_FROM_STAGE, removedF);

function removedF(e:Event):void{

trace("I exit");

}

why The removedF function Works well and the addedF function not work ?!?   in fact nothing Happend on Enter This Frame but on exit i see my I exit Trace !!

[kglad]

because your object was added before your code executed.

[Arioman]

So what can I do about this ??

as i test i cant move

mymc.addEventListener(Event.ADDED_TO_STAGE, addedF);

function addedF(e:Event):void{

trace("I Start");

}

to Previous Frames cause the error Cannot access a property or method of a null object reference. comes !!  and sort of Layers not help too

it seems ADDED_TO_STAGE is not Opposite of Event.REMOVED_FROM_STAGE !!   or in this situation i must use another Script ?!?

and I need some Another Event Script to Realize my object and run a function , isn't it ?

[kglad]

it doesn't make any sense to use that code on a timeline.  that event is used in class files to guarantee access to the display list.

attached to that frame, just call addedF().

[Arioman]

thank you so much , now i have all thing needed by your Help

[kglad]

you're welcome.