How to place a certain option at the end of a list with randomized answers at Limesurvey survey

Randomizing answer items is an often used approach at scientific surveys and market research. At Limesurvey this can easily be done. Just go to the advanced question settings of a certain question and then set “Random order” to “Randomize on each page load“.
But often such a list contains an option like “Don’t know” or “None of these” or similar. Such an option may appear in the middle of the list of answers if they are randomized and that looks confusing to the user.

In order to place a certain answer item at the bottom of a randomized list, add the following JavaScript code at your question text, using the source code mode of the editor:

Source code mode:
Source code mode of integrated Limesurvey editor


<script type='text/javascript'> 
/* Place option 5 at the end of the randomized list */
$(document).ready(function() {
var move_element="5";
/* Please do NOT change the lines below */
var move_element="javatbd{SGQ}"+move_element;
$("#"+move_element).insertAfter("#question{QID} .answers-list .answer-item:last-child");

This script snippet will move answer item 5 to the end of the randomized list. “5” is the answer code of the to be moved item.

You want to re-order the “other” option? No problem, we have explained this at How to re-order the “other” option at a Limesurvey survey.

How to randomly show 1 of X questions at a Limesurvey survey

Sometimes you want to show different versions of a question at a Limesurvey survey. To do so, you need to randomly show one of the X question versions to the user so the first step would be to generate a random number between 1-X. For this we can use the powerful Limesurvey Expression Manager which is available since release 1.92.

The new question type “equation” can be used to store the result of the random function. So create an “equation” question with question code “randnumber” and the following content at the question text field, which will generate a random number between 1 and 2:

The whole code basically means that the system should first check if the rand variable was already populated. If it is still empty, a random number between 1 and 2 is created. Else, the already created number is kept and no new random number gets created.

If you want to hide the question from the user, set “Always hide this question” to “yes” at the advanced question settings.
Now we have a question that will be filled with either “1” or “2”, we can use conditions at following questions to show version A or version B of a question. For this you can use the Limesurvey condition manager and set a condition based on a constant value of 1 or 2 for the equation question. Alternatively you can use the “relevance” field to define when a question should be shown. The appropriate relevance reads:

…and for the second question:

Don’t forget to check if you set up everything correctly by having a look at the survey logic file.

…and if this still sounds too tricky, we can set up the survey for you.