Very basic variable question

Question

I can get my way around Javascript and PHP, but simple things in AS3 stump me.

The following code works fine:

slideIn();
                              function slideIn():void
                              {
                        var myTween:Tween = new Tween(_root.content_txt1,"y",Strong.easeOut,-150,5,3,true);
                              }

I want to reuse the function for different items by inserting an argument (num) in the function. The trace function shows me that the variable has the correct value. However, the Tween doesn't parse the variable "item". It looks for an item named "item", resulting in an error.

slideIn(1);
                              function slideIn(num):void
                              {
                                        var item = "_root.content_txt" + num;
                                        trace(item);
                                        var myTween:Tween = new Tween(item,"y",Strong.easeOut,-150,5,3,true);
                              }

Thanks.

Rothrock · Accepted Answer

To reitterate the question without the misleading "_root" variable:

The first code works fine. The second code generates Error #1056: Cannot create property y on String.

var eric:MovieClip = MovieClip(this.root);
               xml = new XML(e.target.data);
               eric.content_txt1.htmlText = getContent(1);
          slideIn();
               function slideIn():void
               {
var myTween:Tween = new Tween(eric.content_txt1,"y",Strong.easeOut,-150,5,3,true);
               }

var eric:MovieClip = MovieClip(this.root);
xml = new XML(e.target.data);
eric.content_txt1.htmlText = getContent(1);
slideIn(1);
function slideIn(num):void
{
var item = "eric.content_txt" + num;
//trace(item);
var myTween:Tween = new Tween(item,"y",Strong.easeOut,-150,5,3,true);
}

Right, because item is a string and strings don't have a y property. Just because you didn't type the variable item doesn't mean that Flash doesn't know it is a string.

You need to use array notation to get the object inside of the eric movieclip.

var item:TextField=eric["content_txt"+num];

You might also have to actually cast it like this:

var item:TextField=TextField(eric["content_txt"+num]);

Or if you plan to use it on various different display objects:

var item:DisplayObject=DisplayObject(eric["content_txt"+num]);

sinious · Answer

You're no longer in AS2 land, there is no _root.

Try this:

slideIn(1);

function slideIn(num):void

{

var item:MovieClip = MovieClip(getChildByName("content_txt" + num));

trace(item);

var myTween:Tween = new Tween(item,"y",Strong.easeOut,-150,5,3,true);

}

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