Baffling Problem with Acrobat Javascript

Question

I'm hoping someone can help me. I've tried for hours and hours to find what the trouble is but just can't find a solution.
The following code works, however, this is the baffling part. I need to edit / update the code but the problem occurs when I make ANY changes to the code - even indenting a line. You will notice that the code is not indented and poorly formatted - that's because when I had the code indented, I repeatedly got a "SyntaxError: missing } in compound statement"
I am completely baffled as to why sometimes I get the SyntaxError and sometimes not. I swear there are instances where the code worked one time and then another time causes a SyntaxError.
Tried using Adobe Javascript Debugger, tried running code through jslint.com, tried creating a new PDF file and placing this code in that file - still getting SyntaxError if I change or indent the code. The only thing I haven't tried yet is trying it out on the Windows version.
I'm using Acrobat Pro 10.1.3 (Creative cloud) on a Mac OS X Lion 10.7.4
Any help would be really appreciated!
var trackErrors = 0;
var errorMessage = 'Please complete all of the required fields';
if (this.getField('1A').value.length === 0) { errorMessage += ' A Wall Height '; trackErrors++; }
if (this.getField('1B').value.length === 0) { if (trackErrors === 1) { errorMessage += ', B Wall Length '; } else { errorMessage += ' B: Wall Length '; trackErrors++; } }
if (this.getField('1C').value.length === 0) { if (trackErrors === 1) { errorMessage += ', C Spacing '; } else { errorMessage += ' C: Spacing '; trackErrors++; } }
if (this.getField('1-4-radio').value === 'Off') { if (trackErrors === 1) { errorMessage += ' and Material Type - Fabric or Laminate.'; } else { errorMessage += ' Mat type'; trackErrors++; } }
if (trackErrors === 0) {
var x, y, v, z, kits = '';
var flag = 0;
this.getField('1D').value = this.getField('1B').value / 2;
this.getField('1E').value = this.getField('1D').value / this.getField('1C').value;
this.getField('1F').value = Math.floor(this.getField('1E').value);
this.getField('1G').value = this.getField('1F').value + (this.getField('1F').value - 1);
this.getField('1H').value = this.getField('1A').value * this.getField('1G').value;
var materialType = this.getField('1-4-radio').value;
switch (materialType)
case 'F':
x = this.getField('1H').value / 32;
y = Math.ceil(x);
this.getField('bw-kits-required').value = y + " Kit Required";
break;
case 'L':
x = this.getField('1H').value / 128;
y = this.getField('1H').value / 32;
if (flag === 0) {
if (x === Math.round(x)) { kits += x + ' kit '; flag++; }
if (y === Math.round(y)) { kits += y + ' kit '; flag++; }
v = Math.floor(x);
x -= v;
if (v > 0) { if (x < 0.75) { kits += v + ' kit'; v = Math.ceil((x * 128) / 32); kits += ' and ' + v + ' kit'; } else if (x >= 0.75) { kits += (v + 1) + ' kit '; } } else { kits += Math.ceil(y) + ' kit'; }
this.getField('bw-kits-required').value = kits;
break;
} else { app.alert(errorMessage); }

Answer 1

I don't get the same thing in Acrobat 9 on Windows XP. It would be interesting to see what happens if you copy what you posted here on the forum and use it.
I would suggest changing code like:
if (this.getField('1A').value.length === 0)
To something like this:
if (this.getField('1A').valueAsString.length === 0)
If you use the value property and the field value is numeric (or "true" or "false"), it won't have a length property because the type of the value isn't "string", so it will be undefined. Since the special value of undefined is not equal to zero the code works, but it's a bit misleading. It could be further refined to just:
if (!getField('1A').valueAsString)