If I have 5 check boxes, how can I make it so only 2 of the 5 can be selected at the same time

Community Beginner ,
Jan 24, 2019 Jan 24, 2019

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I want to create a quiz that contains a question with 5 possible answers. To do this I use check boxes. Out of those 5 answers, only 2 are correct.

I know how to restrict a set of check boxes so only 1 can be ticked at a time. However, is there any way to make it so that only 2 can be ticked st a time?

Thom Parker​ - I’ve seen your name all over other threads so I’m hoping you know the answer

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PDF forms, Windows

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correct answers 1 Correct Answer

Adobe Community Professional , Jan 24, 2019 Jan 24, 2019
If the checkbox names are all grouped with a prefix, i.e. "Group1.check1", then here is a script for counting checksPut this code into a calculation script, in a hidden text field.var aFlds = this.getField("Group1").getArray();var nCnt = 0;aFlds.forEach(function(a){if(a.value!="Off") nCnt++;});// next, test the current valueif((event.source.value != "Off")&& (nCnt > 2))  this.Set = "Off";else  this.Set = null;Then add this code to the mouseUp Action of every checkboxif(this.Set)   event.target.v...

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Adobe Community Professional ,
Jan 24, 2019 Jan 24, 2019

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There's no built-in methodology for this. It has to be done with a script. And it's complicated because you have to both count the number of checks and then disable the latest mouse click. These scripts go to different locations.

Do you have any experience scripting?

Thom Parker - Software Developer at PDFScripting
Use the Acrobat JavaScript Reference early and often

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Community Beginner ,
Jan 24, 2019 Jan 24, 2019

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Hi Thom,

Thanks for replying so quickly.

I don’t really have any experience with scripting. I tend to search online and find the piece of code I need. However, I don’t understand why Code is written the way it is.

I guess if this particular scripting is complex then I’ll opt not to do it, because I will need to rely on other designers being able to amend the documents on future...and they will have even less experience than me

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Adobe Community Professional ,
Jan 24, 2019 Jan 24, 2019

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If the checkbox names are all grouped with a prefix, i.e. "Group1.check1", then here is a script for counting checks

Put this code into a calculation script, in a hidden text field.

var aFlds = this.getField("Group1").getArray();

var nCnt = 0;

aFlds.forEach(function(a){if(a.value!="Off") nCnt++;});

// next, test the current value

if((event.source.value != "Off")&& (nCnt > 2))

  this.Set = "Off";

else

  this.Set = null;

Then add this code to the mouseUp Action of every checkbox

if(this.Set)

   event.target.value = this.Set;

Thom Parker - Software Developer at PDFScripting
Use the Acrobat JavaScript Reference early and often

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Community Beginner ,
Feb 03, 2019 Feb 03, 2019

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Thanks for this Thom, and sorry for the delay in replying. I’ll give it a go!

Seb

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New Here ,
Mar 01, 2021 Mar 01, 2021

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Greeting Thom and everyone, I have something similar that would like to have your advice. Actually i have 100 plus question with 3 choices: Yes, No, NA. The default No is check (cross). What i want is if I check Yes or NA, the cross check in check box of No is removed. Thanks for your kindly support as I have no idea how to write a script. 

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