TypeError: f is null

[Zarquon42]

I'm using the script described at Counting formula for checkboxes, but I'm receiving a "TypeError: f is null" error whenever I close the JavaScript Editor.

AFSimple_Calculate reveals that 

var f = this.getField(aFields[i]);

but that doesn't help me figure out what's going wrong. The only thing I've changed in the script is that I've changed "MyChecks" to "Points".

Help please? I'm using Acrobat 9 (yes, 9. Don't judge) on a Mac.

[try67 · Accepted solution]

That means one of the field names you've entered is incorrect. Make sure you re-select the fields in your calculation after renaming or removing one of them, as the list doesn't update automatically when you do.

[Zarquon42]

Alright, I think I figured that part out; thanks. But I'm having another difficulty.  I have three fields named Points.Q1, three named Points.Q2, etc. This is working great for its purpose: You can check one and only one of those fields. However, the counting script discussed here only counts when the first of the three identically-named fields in any set is checked. Is there a way around this problem? 

[try67]

Can you post your code, or your actual file?

[Zarquon42]

Sure. Thanks.

[try67]

Works fine for me.

[try67 · Accepted solution]

Sorry, I was looking at the total points field, not the number of objectives with points.

To fix that one change this part:

aCkFlds[i].isBoxChecked(0)

To:

aCkFlds[i].valueAsString!="Off"

[Zarquon42]

Thanks so much! That worked perfectly. I really need to sit down and learn Javascript.

[Bernd Alheit]

Following

aCkFlds[i].isBoxChecked(0)

tests only the first checkbox of a group.

You must also test

aCkFlds[i].isBoxChecked(1)

and

aCkFlds[i].isBoxChecked(2)