I had a problem with a multiple choice question where the respondent HAD to choose their top 3 answers BUT the question had an exclusive option in the list. 

After trying unsuccessfully to do this with the question validation, I still cannot get that to work for me I should look into it more, I came up with the following script that may be helpful to others in this situation

On a mandatory Multiple Choice question I used this...

// Stop the next button submitting the answers
$('#ls-button-submit').bind('click', function () { 

//The answer code for the Exclusive Option
if ( !$("#answer172258X582X2244812").prop('checked')) {

      // The count of required answers
     if  ($("input:checkbox:checked").length ! ) {

                 // The message that comes up on trying to submit the question if the Exclusive option is not selected or the number of answers is not the required count.
                alert("Please select three messages.");
            return false; 
            }
      }
});

Hope this can help someone else

This works on Limesurvey 3.25
 

wrote:

After trying unsuccessfully to do this with the question validation, I still cannot get that to work for me I should look into it more, I came up with the following script that may be helpful to others in this situation


 

Without using included exclude, question code to Q00

(count(self.NAOK==1) and !is_empty(Q00_EXCLUDE.NAOK) )
OR
(count(self.NAOK=) and is_empty(Q00_EXCLUDE.NAOK) )

no ?

[EDIT] and with exclude option
!is_empty(Q00_EXCLUDE.NAOK) or count(self.NAOK) == 3
(sample survey)

Thanks Denis, I will experiment with the question validation some more as this seems simpler.