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90 lines
2.8 KiB
JavaScript
90 lines
2.8 KiB
JavaScript
/**
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* jspsych-survey-likert
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* a jspsych plugin for measuring items on a likert scale
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*
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* Josh de Leeuw
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*
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* documentation: docs.jspsych.org
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*
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*/
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jsPsych.plugins['survey-likert'] = (function() {
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var plugin = {};
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plugin.trial = function(display_element, trial) {
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// default parameters for the trial
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trial.preamble = typeof trial.preamble === 'undefined' ? "" : trial.preamble;
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// if any trial variables are functions
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// this evaluates the function and replaces
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// it with the output of the function
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trial = jsPsych.pluginAPI.evaluateFunctionParameters(trial);
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// show preamble text
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display_element.append($('<div>', {
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"id": 'jspsych-survey-likert-preamble',
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"class": 'jspsych-survey-likert-preamble'
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}));
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$('#jspsych-survey-likert-preamble').html(trial.preamble);
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display_element.append('<form id="jspsych-survey-likert-form">');
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// add likert scale questions
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for (var i = 0; i < trial.questions.length; i++) {
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form_element = $('#jspsych-survey-likert-form');
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// add question
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form_element.append('<label class="jspsych-survey-likert-statement">' + trial.questions[i] + '</label>');
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// add options
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var width = 100 / trial.labels[i].length;
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options_string = '<ul class="jspsych-survey-likert-opts" data-radio-group="Q' + i + '">';
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for (var j = 0; j < trial.labels[i].length; j++) {
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options_string += '<li style="width:' + width + '%"><input type="radio" name="Q' + i + '" value="' + j + '"><label class="jspsych-survey-likert-opt-label">' + trial.labels[i][j] + '</label></li>';
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}
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options_string += '</ul>';
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form_element.append(options_string);
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}
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// add submit button
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display_element.append($('<button>', {
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'id': 'jspsych-survey-likert-next',
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'class': 'jspsych-survey-likert jspsych-btn'
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}));
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$("#jspsych-survey-likert-next").html('Submit Answers');
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$("#jspsych-survey-likert-next").click(function() {
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// measure response time
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var endTime = (new Date()).getTime();
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var response_time = endTime - startTime;
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// create object to hold responses
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var question_data = {};
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$("#jspsych-survey-likert-form .jspsych-survey-likert-opts").each(function(index) {
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var id = $(this).data('radio-group');
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var response = $('input[name="' + id + '"]:checked').val();
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if (typeof response == 'undefined') {
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response = -1;
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}
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var obje = {};
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obje[id] = response;
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$.extend(question_data, obje);
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});
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// save data
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var trial_data = {
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"rt": response_time,
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"responses": JSON.stringify(question_data)
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};
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display_element.html('');
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// next trial
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jsPsych.finishTrial(trial_data);
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});
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var startTime = (new Date()).getTime();
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};
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return plugin;
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})();
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