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Current version: 1.1.3. See version history.

This plugin displays HTML content and allows the participant to respond by dragging a slider.


In addition to the parameters available in all plugins, this plugin accepts the following parameters. Parameters with a default value of undefined must be specified. Other parameters can be left unspecified if the default value is acceptable.

Parameter Type Default Value Description
stimulus HTML string undefined The string to be displayed
labels array of strings [] Labels displayed at equidistant locations on the slider. For example, two labels will be placed at the ends of the slider. Three labels would place two at the ends and one in the middle. Four will place two at the ends, and the other two will be at 33% and 67% of the slider width.
button_label string 'Continue' Label of the button to end the trial.
min integer 0 Sets the minimum value of the slider.
max integer 100 Sets the maximum value of the slider.
slider_start integer 50 Sets the starting value of the slider
step integer 1 Sets the step of the slider. This is the smallest amount by which the slider can change.
slider_width integer null Set the width of the slider in pixels. If left null, then the width will be equal to the widest element in the display.
require_movement boolean false If true, the participant must move the slider before clicking the continue button.
prompt string null This string can contain HTML markup. Any content here will be displayed below the stimulus. The intention is that it can be used to provide a reminder about the action the participant is supposed to take (e.g., which key to press).
stimulus_duration numeric null How long to display the stimulus in milliseconds. The visibility CSS property of the stimulus will be set to hidden after this time has elapsed. If this is null, then the stimulus will remain visible until the trial ends.
trial_duration numeric null How long to wait for the participant to make a response before ending the trial in milliseconds. If the participant fails to make a response before this timer is reached, the participant's response will be recorded as null for the trial and the trial will end. If the value of this parameter is null, then the trial will wait for a response indefinitely.
response_ends_trial boolean true If true, then the trial will end whenever the participant makes a response (assuming they make their response before the cutoff specified by the trial_duration parameter). If false, then the trial will continue until the value for trial_duration is reached. You can set this parameter to false to force the participant to view a stimulus for a fixed amount of time, even if they respond before the time is complete.

Data Generated

In addition to the default data collected by all plugins, this plugin collects the following data for each trial.

Name Type Value
response numeric The numeric value of the slider.
rt numeric The time in milliseconds for the participant to make a response. The time is measured from when the stimulus first appears on the screen until the participant's response.
stimulus string The HTML content that was displayed on the screen.
slider_start numeric The starting value of the slider.


Using the CDN-hosted JavaScript file:

<script src=""></script>

Using the JavaScript file downloaded from a GitHub release dist archive:

<script src="jspsych/plugin-html-slider-response.js"></script>

Using NPM:

npm install @jspsych/plugin-html-slider-response
import htmlSliderResponse from '@jspsych/plugin-html-slider-response';


Displaying question until participant moves the slider
var trial = {
    type: jsPsychHtmlSliderResponse,
    stimulus: `<div style="width:500px;">
        <p>How likely is it that team A will win this match?</p>
        <div style="width:240px; float: left;">
            <p>TEAM A</p>
            <p>10 wins, 5 losses, 6 draws</p>
        <div style="width:240px; float: right;">
            <p>TEAM B</p>
            <p>6 wins, 4 losses, 11 draws</p>
    require_movement: true,
    labels: ['100% chance', '50% chance', '0% chance']

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