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Z
Zarquon42
New Participant
January 28, 2021
Answered

TypeError: f is null

  • January 28, 2021
  • 2 replies
  • 4171 views

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.

This topic has been closed for replies.
Correct answer try67

Works fine for me.


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"

2 replies

Z
Zarquon42Author
New Participant
February 5, 2021

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
try67
Community Expert
February 6, 2021

Can you post your code, or your actual file?

Z
Zarquon42Author
New Participant
February 10, 2021

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"


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

try67
try67
Community Expert
January 28, 2021

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.

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