jsPsych/docs/plugins/jspsych-survey-multi-choice.md

jspsych-survey-multi-choice plugin

The survey-multi-choice plugin displays a set of questions with multiple choice response fields. The subject selects a single answer.

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
questions	array	undefined	An array of objects, each object represents a question that appears on the screen. Each object contains a prompt, options, required, and horizontal parameter that will be applied to the question. See examples below for further clarification.prompt: Type string, default value is undefined. The string is prompt/question that will be associated with a group of options (radio buttons). All questions will get presented on the same page (trial).options: Type array, defualt value is undefined. An array of strings. The array contains a set of options to display for an individual question.required: Type boolean, default value is null. The boolean value indicates if a question is required('true') or not ('false'), using the HTML5 required attribute. If this parameter is undefined, the question will be optional. Note: The HTML5 required attribute is not currently supported by the Safari browser.horizontal:Type boolean, default value is false. If true, then the question is centered and the options are displayed horizontally.
preamble	string	empty string	HTML formatted string to display at the top of the page above all the questions.
button_label	string	'Continue'	Label of the button.

Data Generated

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

Name	Type	Value
responses	JSON string	A string in JSON format containing the response for each question. The encoded object will have a separate variable for the response to each question, with the first question in the trial being recorded in Q0, the second in Q1, and so on. The responses are recorded as the name of the option label.
rt	numeric	The response time in milliseconds for the subject to make a response. The time is measured from when the questions first appear on the screen until the subject's response.

Examples

Basic example with multiple questions on a page.

    // defining groups of questions that will go together.
    var page_1_questions = ["I like vegetables.", "I like fruit."];

    // definiting two different response scales that can be used.
    var page_1_options = ["Strongly Disagree", "Disagree", "Neutral", "Agree", "Strongly Agree"];
    var page_2_options = ["Strongly Disagree", "Disagree", "Somewhat Disagree", "Neural", "Somewhat Agree", "Agree", "Strongly Agree"];

    var multi_choice_block = {
      type: 'survey-multi-choice',
      questions: [{prompt: "I like vegetables", options: page_1_options, required:true,}, {prompt: "I like fruit", options: page_2_options, required: false}],
    };

    var multi_choice_block_horizontal = {
      type: 'survey-multi-choice',
      questions: [{prompt: "I like vegetables", options: page_1_options, required: true, horizontal: true,}, {prompt: "I like fruit", options: page_2_options, required: false, horizontal: false}],
    };

    jsPsych.init({
      timeline: [multi_choice_block, multi_choice_block_horizontal],
      on_finish: function() {
        jsPsych.data.displayData();
      }
    });