The dualSidedSlider function allow for the measurement of trade-offs between two items. It automatically allocates percentages (or some other allocation) to two items when the slider is moved and records both values. Functionality includes:

• Supports 'Not Applicable'
• Support allocations other than percentage

Here is a quick video demonstration:

This function is available for a reasonable fee. Contact TomG on the Qualtrics Community to learn more.

Add the dualSidedSlider function to the survey header to make it available to any page/question in the survey. Go to Look & Feel → General → Header edit → and paste the provided freezeTopQ function JS:

<script>/*Paste dualSidedSlider function JS here*/</script>

Alternatively, paste the dualSidedSlider function JS into a question's JS outside the existing Qualtrics functions to make it available to questions on the page.

Add JS to call the dualSidedSlider function to apply it to the first question on a page (the question to be frozen at the top) as follows:

Qualtrics.SurveyEngine.addOnload(function() {
	dualSidedSlider(this);
});

To change the default option (i.e., the scale), specify the desired options in the second function argument as an object. For example:

Qualtrics.SurveyEngine.addOnload(function() {
	dualSidedSlider(this,{max:10,after:" "});
});

after the character(s) to shown after the value.

Default: %

debug turn on debug mode to see the values captured in the hidden question.

Default: false

max the scale maximum (should match the slider scale maximum).

Default: 100