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

• Not Applicable option
• Allocations other than percentage
• Item randomization
• Mobile devices

Here is a quick video demonstration:

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

dualSidedSlider requires two questions, a Slider question followed immediately by a Form Field question that will be hidden from the respondent.

Requirements for the Slider question:

• One row - the row label can be any text and won't be displayed
• Two labels - the two items being compared
• Scale must start at zero
• Show value on
• Mobile friendly off (dualSidedSlider is still mobile compatible even though Mobile friendly is turned off)
• Start position at midpoint

Requirements for the Form Field question:

• Must immediately follow Slider question
• Two fields
• First field must match left label in Slider question
• Second field must match right label in Slider question

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 slider 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 slider question as follows:

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

To change the default options, specify the desired options in the second function argument as an object. For example:

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

after specifies the character(s) to show after the value.

Default: "%"

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

Default: false

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

Default: 100

random turns on randomization, which randomly flips the left and right items.

Default: false

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