Matrix Constant Sum Don't know / None

Question

I want to add Don't know/None button in a multiple column constant sum matrix question.I have the following code but it only works with a single column. I'm unable to make it work for 3 columns, with each column with their independent don't know button.Qualtrics.SurveyEngine.addOnReady(function() {    /* SETTINGS */    var row = 6; /* what row is the "don't know" row? */    /* END OF SETTINGS */    var qid = this.questionId;    var dk = document.getElementsByName("QR~" + qid + "~" + row);     for (i = 0; i < dk.length; i++) {        dk[i].type = "radio";    }    var inputs = $(this.getQuestionContainer()).select('input[type="text"]');    dk[0].onclick = function() {         for (var i = 0; i < inputs.length; i++) {            inputs[i].value = "0";        }        dk[0].value = "1";     }    for (var i = 0; i < inputs.length; i++) {        var input = inputs[i];        $(input).insert({after: ' %'});        inputs[i].onclick = function() {            dk[0].value = "0";             dk[0].checked = false;        }    }});

jbk · Answer

Instead of having Dont know as a row in constant sum question type.You can add Dont know/none as a new question(mutli choiice with just 1 option and set as multiple asnwer) without any question text or page break.Then you can add JS to make sure validation works.

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