as3 quick q 77 Responses

Last post: 7 months, 1 week ago | Thread started: Mar 6, 08, 7:09 a.m.

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• scpgt

  How can I check to see if a particular instance name exists in my movie?

  Something like:

  if(box1.stage) {
  trace("exists");
  }

  but this particular example produces a compiler error if box1 doesn't exist.. Is there a better way to go about it?

  Mar 6, 08, 7:09 a.m. – Permalink

• ephix

  if (this.parent.instancename) ?

  not really sure. just an idea.

  • you can just use the target button thingo, usually helps– ephix

  

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  Dog-earMar 6, 08, 7:11 a.m. – Permalink

• scpgt

  if only twere that easy..

  basically, there's several dozen dynamically generated movieclips and at a given point i need to check if a particular one exists on the stage..

  you'd think it'd be straightforward but apparently not..

  • fair enough– ephix

  

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  Dog-earMar 6, 08, 7:14 a.m. – Permalink

• forbes

  try
  if(box1 =! null) {
  trace("exists")'
  }

  

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  Dog-earMar 6, 08, 7:19 a.m. – Permalink

• scpgt

  ahhh... nice try.. but same error:

  1120: Access of undefined property box1.

  • only seems to affect AS3 as well..
    feckin thing– scpgt

  

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  Dog-earMar 6, 08, 7:22 a.m. – Permalink

• enjine

  there is a method to do this on every subclass of DisplayObjectContainer (i.e. Sprite, MovieClip, ...). From the language reference:

  Determines whether the specified display object is a child of the DisplayObjectContainer instance or the instance itself. The search includes the entire display list including this DisplayObjectContainer instance. Grandchildren, great-grandchildren, and so on each return true.
  Parameters
  child:DisplayObject — The child object to test.

  Returns
  Boolean — true if the child object is a child of the DisplayObjectContainer or the container itself; otherwise false.

  Example
  The following example sets up a number of Sprite objects and adds some to the child list of others. (A Sprite object is a type of display object container.) The relationship between various objects is shown by calling the contains() method:

  import flash.display.Sprite;

  var sprite1:Sprite = new Sprite();
  var sprite2:Sprite = new Sprite();
  var sprite3:Sprite = new Sprite();
  var sprite4:Sprite = new Sprite();

  sprite1.addChild(sprite2);
  sprite2.addChild(sprite3);

  trace(sprite1.contains(sprite1… // true
  trace(sprite1.contains(sprite2… // true
  trace(sprite1.contains(sprite3… // true
  trace(sprite1.contains(sprite4… // false

  

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  Dog-earMar 6, 08, 7:25 a.m. – Permalink

• forbes

  var box1:BOX1 = new BOX1;
  addChild(box1);

  if (box1 =! null) {
  trace("exists");
  }

  ok ive defined the box1 and added it to the stage.. try that

  

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  Dog-earMar 6, 08, 7:57 a.m. – Permalink

• scpgt

  Ta for the tips... by process of looking at those and then experimenting a bit, best option turned out to be

  if (Boolean(getChildByName('box1… {
  trace("exists");
  } else {
  trace("doesn't!");
  }

  in case anyone's bothered :)

  Ta again!

  

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  Dog-earMar 6, 08, 8:18 a.m. – Permalink