8 responses to “AS3 - how to do eval() the right way”

1. 

   testor April 30th, 2009 at 06:37

   Hey great !!! after 20 min searching on google, you are the only one giving a REAL solution to this problem(solution 2 is the best yeah :))

   Thanks a lot !

2. 

   whodeee April 30th, 2009 at 07:20

   Glad I could help!

3. 

   davidesieb July 28th, 2009 at 03:13

   Hello, but how make AS3 “evaluate” a variable value?

   Say I have a variable:

   var vMyExampleVar_X:Number = 100;
   var vMyExampleVarTwo_X:Number = 50;

   and I want to dynamically access to it :

   function fReturnVarValue (vVarName) {
   var vValue = this["v"+vVarName+"_X"];
   return vValue;
   }
   //
   fReturnVarValue (”MyExampleVar”);
   fReturnVarValue (”MyExampleVarTwo”);

   -> this doesn’t work… See what I mean?
   Thanks for your help

4. 

   whodeee July 28th, 2009 at 08:21

   I tested your code that you wrote and it seems to work just fine that way. created variables from your function and traced them and they are returning correctly - see the updated code below
   var vMyExampleVar_X:Number = 100;
var vMyExampleVarTwo_X:Number = 50;
//
function fReturnVarValue (vVarName) {
var vValue = this["v"+vVarName+"_X"];
return(vValue);
}
//
var newVar1:Number = fReturnVarValue (”MyExampleVar”);
var newVar2:Number = fReturnVarValue (”MyExampleVarTwo”);
trace (newVar1)
trace (newVar2)

   Hope this helps you - let me know if you have any other troubles.

5. 

   Vinay July 30th, 2009 at 02:06

   Hi Thanks a lot for wonderfull solution

6. 

   bruno December 3rd, 2009 at 11:58

   Thanks!, this helps so much…but i have a new question. Im trying to create a new instance dinamicaly, like this:
   ———————————-
   ….
   var slidesNum:int = 1;
   var mcString = “mc”+1;
   var oMc1:MovieClip = new[mcString]();
   ….
   ———————————-

   and it returns this:
   TypeError: Error #1007: Instantiation attempted on a non-constructor.

   should this works?

   Im really stuck… can u give-me a little hand?..(or a entire arm?)

7. 

   bruno December 3rd, 2009 at 12:01

   i try this too
   ———————————-
   ….
   var slidesNum:int = 1;
   var mcString = “mc”+1;
   var oMc1:MovieClip = new this[mcString]();
   ….
   ———————————-

   the result is the same!

8. 

   whodeee December 3rd, 2009 at 12:48

   Try this out:
   var slidesNum:int = 1;
   var mcString:String = “mc”+1;

   var oMc1:MovieClip = new MovieClip();
   oMc1.name = mcString;

   Let me know if that is what you are trying to do. Without seeing more of your code I am not sure if that is what you will need.