Hi all,I have a constant sum question where respondents are required to allocate 100 “tokens” to different categories -- each category being a slider. The idea is that the sum of all sliders should be exactly 100, but I also wanted to allow my respondents to skip this question.My problem is very similar to this one, with a few caveats. First, the author of the original post was using a constant sum question with answer type “Choices”. I’m using answer type “Sliders”, which required a slightly different syntax. I managed to maneuver this difference using Javascript, and as of now, the validation condition with JS successfully requires the sum of the sliders to be either 100 or zero. However (and this is the second caveat and my problem here) there is a very annoying aspect with this workaround: if the sliders don’t sum EXACTLY TO 100, the answer is not valid. In other words, if my user moves the sliders to values that sum to slightly more -- or less -- than that (say, 97 or 102), they are not allowed to continue the survey: they have to millimetrically move the slider to meet the validation condition (which I find very annoying). The native validation condition in Qualtrics has an interesting feature: in addition to the validation condition requiring the sum of sliders to be 100, it puts a cap on the sliders. In other words, once the sum of the sliders’ values reach 100, you can’t move them up (you can only move them down). However, the big problem with this native validation condition is that it doesn’t allow the question to be skipped (i.e., to have sum = 0) -- as joshkahn21 originally pointed in that post .I tried inspecting the Qualtrics elements of a web survey including the native validation condition, but couldn’t find a way to replicate this feature (AND allow for skipping/sum = 0 using Javascript). Does anyone have any insights on how to solve for this? I don’t want to switch to a different type of answer type, since, in my context, sliders are useful/intuitive for respondents. Also, very frustrating that it’s been four years since joshkahn21 made that post and product developers haven’t added this feature yet.

I did the same thing as vgayraud. To give it a try, create 4 sliders where the 4th one will be hidden, and set the validation to Must Total = 100. Then, update the question’s JavaScript with the below:Qualtrics.SurveyEngine.addOnload(function(){/*Place your JavaScript here to run when the page loads*/var that = this;var qid = this.questionId;// Get value of the 4th slidervar val4 = parseInt(document.getElementById(qid+"~4~true-result").value) || 0;//if 4th slider = 100 on page load, set value to 0if (val4 === 100) {that.setChoiceValue(4, 0)}});Qualtrics.SurveyEngine.addOnReady(function(){/*Place your JavaScript here to run when the page is fully displayed*/// hide 4th slidervar qid = this.questionIddocument.getElementById(qid).querySelector('tr[choiceid="4"]').style.display = "none";});Qualtrics.SurveyEngine.addOnUnload(function(){/*Place your JavaScript here to run when the page is unloaded*/});Qualtrics.SurveyEngine.addOnPageSubmit(function() {var that = this;var qid = this.questionId;// Get values of the first 3 slidersvar val1 = parseInt(document.getElementById(qid+"~1~true-result").value) || 0;var val2 = parseInt(document.getElementById(qid+"~2~true-result").value) || 0;var val3 = parseInt(document.getElementById(qid+"~3~true-result").value) || 0;// If all three are zero, set the 4th/hidden slider to 100if (val1 === 0 && val2 === 0 && val3 === 0) {that.setChoiceValue(4, 100)document.getElementById(qid+"~total").style.visibility = "hidden";}});

I tried inspecting the Qualtrics elements of a web survey including the native validation condition, but couldn’t find a way to replicate this feature (AND allow for skipping/sum = 0 using Javascript). Does anyone have any insights on how to solve for this? I don’t want to switch to a different type of answer type, since, in my context, sliders are useful/intuitive for respondents.Hi,I tackled this by adding a last hidden slider statement to the constant sum question and setting its value to the wanted total value with the question API on page submit if the sum of all the previous sliders’ values was equal to 0.Also had to add a function to reset all sliders to 0 on page ready to allow the use of the previous button, and a function to change the validation text to the actual condition.

Allowing respondents to skip constant sum questions despite 'Must Total' validation WITH SLIDERS and KEEPING THE SLIDER CAP

Allowing respondents to skip constant sum questions despite 'Must Total' validation WITH SLIDERS and KEEPING THE SLIDER CAP | Experience Community

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