Randomly flip/rotate response option order in Qualtrics

rotate_order_qualtrics.js

// Set an embedded data element called "response_order" in survey flow to randomly have value of "reversed" half the time 
// Add the following JavaScript to the questions for which you want to flip the ordering (see here: https://www.qualtrics.com/support/survey-platform/edit-survey/question-options/add-javascript/). 
// This is a (very) minor variation on: http://stackoverflow.com/a/30766022
// It allows all response scales to increase/decrease in the same direction for a given respondent, but avoids response order bias. 

Qualtrics.SurveyEngine.addOnload(function() {
	var r_order = "${e://Field/response_order}"
    if(r_order == "reversed") {
        var qid = this.questionId;
        var choices = $(qid).select('li.Selection');
        var lastChoice = choices.last();
        for(i=0;i<choices.length-1;i++) {
            $(lastChoice).insert({
                after: choices[i]
            });
        }   
    }
});

A similar process can be used to flip the order of answer choices of matrix style questions:

Qualtrics.SurveyEngine.addOnload(function() {
    var r_order = "${e://Field/response_order}"
    if(r_order == "reversed") {
        var qid = this.questionId;
        var headers = $(qid).select('tr.Answers > th');
        var lastHeader = headers.last();
        for(i=0;i<headers.length-1;i++) {
            $(lastHeader).insert({
                after: headers[i]
            });
        }
        var choiceRows = $(qid).select('tr.ChoiceRow');
        for(i=0;i<choiceRows.length;i++) {
            var choices = $(choiceRows[i]).select("td:not(.BorderColor)");
            var lastChoice = choices.last();
            for(c=0;c<choices.length-1;c++) {
                $(lastChoice).insert({
                   after: choices[c]
                });
            }
        }
    }
});