setInterval scope

[emsee]

Hello!

I'm trying to get to grips with as2, but I'm having problems with setInterval. Anyone know what I'm doing wrong?

//Class
class Test {
     
     private var intervalID:Number;
     
     function Test() {
          loadFile();
     }
     
     private function loadFile():Void {
          intervalID = setInterval(this, "readTrack", 1000, "foo");
     }
     
     private function readTrack(sString:String):Void {
          trace(sString);
          var myThing:String = "bar";
          displayThing(myThing);
     }
     
     private function displayThing(vThing:String):Void {     
          trace(vThing);
     }
     
}


//Code in movie
stop();
function init() {
     var thing:Test = new Test();
}
init();

Any help you can give me is appreciated - thanks!

[senocular]

dont make your class instance a local (i.e. temporary) variable.

stop();
var thing:Test;
function init() {
     thing = new Test();
}
init();

[deQue]

You have an error in your interval deffinision:

PHP Code:

intervalID = setInterval(this, "readTrack", 1000, "foo"); 


Should be:

PHP Code:

intervalID = setInterval(readTrack, 1000, "foo"); 


[emsee]

var emsee:Dumbness;
function init() {
  emsee = new Dumbness();
}
init()

Thanks senocular, I think I must be going blind!

[emsee]

deQue: actually, that's to provide the readTrack function with scope. Otherwise it can't call the displayThing method.

[senocular]

Originally Posted by emsee

var emsee:Dumbness;
function init() {
  emsee = new Dumbness();
}
init()

Thanks senocular, I think I must be going blind!

Its actually a very common problem. Whether you meant to make it a local variable or not, its not too intuitive that an interval in such a situation will fizzle as a result of the containing objects destruction in memory. Used to get similar questions a bit, but I haven't seen one in a while

[deQue]

Yeah, I got that. thx.