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238 lines
7.6 KiB
JavaScript
238 lines
7.6 KiB
JavaScript
/**
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* jspsych-image-slider-response
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* a jspsych plugin for free response survey questions
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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['image-slider-response'] = (function() {
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var plugin = {};
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jsPsych.pluginAPI.registerPreload('image-slider-response', 'stimulus', 'image');
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plugin.info = {
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name: 'image-slider-response',
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description: '',
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parameters: {
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stimulus: {
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type: jsPsych.plugins.parameterType.IMAGE,
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pretty_name: 'Stimulus',
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default: undefined,
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description: 'The image to be displayed'
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},
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stimulus_height: {
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type: jsPsych.plugins.parameterType.INT,
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pretty_name: 'Image height',
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default: null,
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description: 'Set the image height in pixels'
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},
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stimulus_width: {
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type: jsPsych.plugins.parameterType.INT,
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pretty_name: 'Image width',
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default: null,
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description: 'Set the image width in pixels'
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},
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maintain_aspect_ratio: {
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type: jsPsych.plugins.parameterType.BOOL,
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pretty_name: 'Maintain aspect ratio',
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default: true,
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description: 'Maintain the aspect ratio after setting width or height'
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},
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min: {
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type: jsPsych.plugins.parameterType.INT,
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pretty_name: 'Min slider',
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default: 0,
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description: 'Sets the minimum value of the slider.'
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},
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max: {
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type: jsPsych.plugins.parameterType.INT,
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pretty_name: 'Max slider',
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default: 100,
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description: 'Sets the maximum value of the slider',
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},
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slider_start: {
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type: jsPsych.plugins.parameterType.INT,
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pretty_name: 'Slider starting value',
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default: 50,
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description: 'Sets the starting value of the slider',
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},
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step: {
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type: jsPsych.plugins.parameterType.INT,
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pretty_name: 'Step',
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default: 1,
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description: 'Sets the step of the slider'
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},
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labels: {
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type: jsPsych.plugins.parameterType.HTML_STRING,
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pretty_name:'Labels',
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default: [],
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array: true,
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description: 'Labels of the slider.',
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},
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slider_width: {
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type: jsPsych.plugins.parameterType.INT,
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pretty_name:'Slider width',
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default: null,
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description: 'Width of the slider in pixels.'
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},
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button_label: {
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type: jsPsych.plugins.parameterType.STRING,
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pretty_name: 'Button label',
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default: 'Continue',
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array: false,
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description: 'Label of the button to advance.'
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},
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require_movement: {
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type: jsPsych.plugins.parameterType.BOOL,
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pretty_name: 'Require movement',
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default: false,
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description: 'If true, the participant will have to move the slider before continuing.'
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},
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prompt: {
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type: jsPsych.plugins.parameterType.STRING,
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pretty_name: 'Prompt',
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default: null,
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description: 'Any content here will be displayed below the slider.'
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},
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stimulus_duration: {
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type: jsPsych.plugins.parameterType.INT,
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pretty_name: 'Stimulus duration',
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default: null,
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description: 'How long to hide the stimulus.'
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},
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trial_duration: {
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type: jsPsych.plugins.parameterType.INT,
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pretty_name: 'Trial duration',
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default: null,
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description: 'How long to show the trial.'
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},
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response_ends_trial: {
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type: jsPsych.plugins.parameterType.BOOL,
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pretty_name: 'Response ends trial',
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default: true,
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description: 'If true, trial will end when user makes a response.'
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},
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}
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}
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plugin.trial = function(display_element, trial) {
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// half of the thumb width value from jspsych.css, used to adjust the label positions
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var half_thumb_width = 7.5;
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var html = '<div id="jspsych-image-slider-response-wrapper" style="margin: 100px 0px;">';
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html += '<div id="jspsych-image-slider-response-stimulus">';
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html += '<img src="'+trial.stimulus+'" style="';
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if(trial.stimulus_height !== null){
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html += 'height:'+trial.stimulus_height+'px; '
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if(trial.stimulus_width == null && trial.maintain_aspect_ratio){
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html += 'width: auto; ';
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}
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}
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if(trial.stimulus_width !== null){
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html += 'width:'+trial.stimulus_width+'px; '
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if(trial.stimulus_height == null && trial.maintain_aspect_ratio){
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html += 'height: auto; ';
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}
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}
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html += '"></img>';
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html += '</div>';
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html += '<div class="jspsych-image-slider-response-container" style="position:relative; margin: 0 auto 3em auto; width:';
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if (trial.slider_width !== null) {
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html += trial.slider_width+'px;';
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} else {
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html += 'auto;';
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}
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html += '">';
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html += '<input type="range" class="jspsych-slider" value="'+trial.slider_start+'" min="'+trial.min+'" max="'+trial.max+'" step="'+trial.step+'" id="jspsych-image-slider-response-response"></input>';
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html += '<div>'
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for(var j=0; j < trial.labels.length; j++){
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var label_width_perc = 100/(trial.labels.length-1);
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var percent_of_range = j * (100/(trial.labels.length - 1));
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var percent_dist_from_center = ((percent_of_range-50)/50)*100;
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var offset = (percent_dist_from_center * half_thumb_width)/100;
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html += '<div style="border: 1px solid transparent; display: inline-block; position: absolute; '+
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'left:calc('+percent_of_range+'% - ('+label_width_perc+'% / 2) - '+offset+'px); text-align: center; width: '+label_width_perc+'%;">';
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html += '<span style="text-align: center; font-size: 80%;">'+trial.labels[j]+'</span>';
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html += '</div>'
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}
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html += '</div>';
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html += '</div>';
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html += '</div>';
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if (trial.prompt !== null){
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html += trial.prompt;
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}
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// add submit button
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html += '<button id="jspsych-image-slider-response-next" class="jspsych-btn" '+ (trial.require_movement ? "disabled" : "") + '>'+trial.button_label+'</button>';
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display_element.innerHTML = html;
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var response = {
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rt: null,
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response: null
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};
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if(trial.require_movement){
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display_element.querySelector('#jspsych-image-slider-response-response').addEventListener('click', function(){
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display_element.querySelector('#jspsych-image-slider-response-next').disabled = false;
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});
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}
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display_element.querySelector('#jspsych-image-slider-response-next').addEventListener('click', function() {
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// measure response time
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var endTime = performance.now();
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response.rt = endTime - startTime;
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response.response = display_element.querySelector('#jspsych-image-slider-response-response').valueAsNumber;
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if(trial.response_ends_trial){
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end_trial();
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} else {
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display_element.querySelector('#jspsych-image-slider-response-next').disabled = true;
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}
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});
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function end_trial(){
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jsPsych.pluginAPI.clearAllTimeouts();
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// save data
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var trialdata = {
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"rt": response.rt,
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"stimulus": trial.stimulus,
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"slider_start": trial.slider_start,
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"response": response.response
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};
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display_element.innerHTML = '';
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// next trial
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jsPsych.finishTrial(trialdata);
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}
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if (trial.stimulus_duration !== null) {
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jsPsych.pluginAPI.setTimeout(function() {
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display_element.querySelector('#jspsych-image-slider-response-stimulus').style.visibility = 'hidden';
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}, trial.stimulus_duration);
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}
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// end trial if trial_duration is set
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if (trial.trial_duration !== null) {
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jsPsych.pluginAPI.setTimeout(function() {
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end_trial();
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}, trial.trial_duration);
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}
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var startTime = performance.now();
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};
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return plugin;
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})();
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