Changing a text value based on a drop down in Acrobat

I'm sorry if this has been discussed before but I'm new and have tried searching but all of the results I find are in the LiveCycle forum and I have Acrobat Pro.
 
I want to simply change a text field based on a drop down. This sample code was suggested in the LiveCycle forum, but doesn't work in my change action tab. Can it be modified to work in Acrobat? If so, how?
 
My text field that I want to set is called TextField1. The following code is in the selection change script for my drop-down list. The drop down has exported values of 24 or 36.
 
Thanks very much for any help.
 
Beth
  
var sNewSel = this.boundItem(xfa.event.newText);
 
switch (sNewSel)
 
{
 
case "24": // 24 inch fixture
 
TextField1.rawValue = "40 watts";
 
break;
   
case "36": // inch fixture
 
TextField1.rawValue = "60 watts"
 
break;
   
default: // unknown value -- do nothing
 
break;
 
}