I might sound dumb, but how do I achieve the following result:

A question group contains 2 questions - one of them is likert scale and other is a comment field. How can I make comment field mandatory if the participant has selected even one answer option which is highlighted with yellow on screenshot?

Right now the comment question is not mandatory. I tried to follow the instructions here: www.limesurvey.org/es/foro/can-i-do-this...put-if-answer-equals , but when I tried to have the "==" either the lable of the answer option or the code of the answer option the question didn't go mandatory.
I am also reading the manual: www.limesurvey.org/manual/Expression_Man...#Access_to_Variables , but again I am not really understanding how can I make what I need happen :(

That much I know that I can make the comment show or be hidden if a certain answer option is selected, however I do want the comment field always be present so I don't think I can achieve it with conditions.

kohuke wrote: That much I know that I can make the comment show or be hidden if a certain answer option is selected, however I do want the comment field always be present so I don't think I can achieve it with conditions.

You can make the comment field mandatory via the Logic section in the advanced settings of the text/comment field.
A bit ExpressionScript (ExpressionManager) knowhow is needed. You already pointed to a thread where that is shown.

Please create a survey (LSS export) with your the two questions and attach that here. And what LimeSurvey version is used?

I did an export of one of the survey groups (I have more with the same option needed). Hopefully this is enough.


Version 3.17.3+190429 should be the version.

Sadly this is the first time I am asked to have that kind of check in place and hopefully someone can dumb it down so I can do what is asked.

Always export LSS (complete example). If you export a LSQ, other will need to create a new survey, check for the correct language to be able to import the LSQ and it still differ from your survey.

Thank you for the explanation and sorry. Here's the full survey.

I have been experimenting with some strings: where K2Kom = comment question itself, K2_SK2Q001 = question and "Ei ole nõus" = answer option. But when I select just the 1st answer to have the "ei ole nõus" option and rest with something else it still jumps to next question when everything else is selected.
When I tried to add all of the subquestion to make comment mandatory if the answer option is shown I get told that invalid code Can anyone assist? Cause I am really lost

When providing sample surveys, please only include the relevant questions. The volunteers giving help here do not have time to go threw a bunch of survey questions only to find that they have nothing to do with the problem.

Expression Manager uses question/sub-question/answer codes, not the labels.

You can test whether any row in the array is answered with one of the first two items with an equation like this:


This effectively says return a sum of all of the K2 sub-questions having an answer equaling "K2K01" or "K2K02".

Please refer to the Expression Manager documentation for available functions - www.limesurvey.org/manual/Expression_Man...#Access_to_Functions

So, the Question validation equation for the comment question could be like this (line-breaks inserted for clarity):


And, the Question validation tip could be like this (line-breaks inserted for clarity):


Sample survey attached:

Thank you very much for the assistance and the explanations. I didn't think that those things should be placed under "Logic" section, furthermore to use a "mathematical" function.
I got to modify all of my question I needed as well as gotten a decent idea on how to accommodate this function to other things if needed.