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jspsych.js
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/**
* jspsych.js
* Josh de Leeuw
*
* documentation: docs.jspsych.org
*
**/
var jsPsych = (function() {
var core = {};
//
// private variables
//
// options
var opts = {};
// experiment timeline
var timeline;
// flow control
var global_trial_index = 0;
var current_trial = {};
var current_trial_finished = false;
// target DOM element
var DOM_target;
// time that the experiment began
var exp_start_time;
// is the experiment paused?
var paused = false;
var waiting = false;
// done loading?
var loaded = false;
// enumerated variables for special parameter types
core.ALL_KEYS = 'allkeys';
core.NO_KEYS = 'none';
//
// public methods
//
core.init = function(options) {
// reset variables
timeline = null;
global_trial_index = 0;
current_trial = {};
current_trial_finished = false;
paused = false;
waiting = false;
loaded = false;
var defaults = {
'display_element': undefined,
'on_finish': function(data) {
return undefined;
},
'on_trial_start': function() {
return undefined;
},
'on_trial_finish': function() {
return undefined;
},
'on_data_update': function(data) {
return undefined;
},
'on_interaction_data_update': function(data){
return undefined;
},
'exclusions': {},
'show_progress_bar': false,
'auto_preload': true,
'max_load_time': 60000,
'fullscreen': false,
'default_iti': 1000
};
// override default options if user specifies an option
opts = $.extend({}, defaults, options);
// set DOM element where jsPsych will render content
// if undefined, then jsPsych will use the <body> tag and the entire page
if(typeof opts.display_element == 'undefined'){
// check if there is a body element on the page
var body = $('body');
if (body.length === 0) {
$(document.documentElement).append($('<body>'));
}
// using the full page, so we need the HTML document to
// have 100% height, and body to have no margin
$('html').css('height','100%');
$('body').css('margin', '0px');
opts.display_element = $('body');
} else {
// make sure that the display element exists on the page
if(opts.display_element.length == 0) {
console.error('The display_element specified in jsPsych.init() does not exist in the DOM.');
}
}
opts.display_element.append('<div class="jspsych-content-wrapper"><div id="jspsych-content"></div></div>')
DOM_target = $('#jspsych-content');
// add CSS class to DOM_target
opts.display_element.addClass('jspsych-display-element')
DOM_target.addClass('jspsych-content');
// create experiment timeline
timeline = new TimelineNode({
timeline: opts.timeline
});
// create listeners for user browser interaction
jsPsych.data.createInteractionListeners();
// check exclusions before continuing
checkExclusions(opts.exclusions,
function(){
// success! user can continue...
// start experiment, with or without preloading
if(opts.auto_preload){
jsPsych.pluginAPI.autoPreload(timeline, startExperiment);
if(opts.max_load_time > 0){
setTimeout(function(){
if(!loaded){
loadFail();
}
}, opts.max_load_time);
}
} else {
startExperiment();
}
},
function(){
// fail. incompatible user.
}
);
};
core.progress = function() {
var percent_complete = typeof timeline == 'undefined' ? 0 : timeline.percentComplete();
var obj = {
"total_trials": typeof timeline == 'undefined' ? undefined : timeline.length(),
"current_trial_global": global_trial_index,
"percent_complete": percent_complete
};
return obj;
};
core.startTime = function() {
return exp_start_time;
};
core.totalTime = function() {
if(typeof exp_start_time == 'undefined'){ return 0; }
return (new Date()).getTime() - exp_start_time.getTime();
};
core.getDisplayElement = function() {
return DOM_target;
};
core.finishTrial = function(data) {
if(current_trial_finished){ return; }
current_trial_finished = true;
// write the data from the trial
data = typeof data == 'undefined' ? {} : data;
jsPsych.data.write(data);
// get back the data with all of the defaults in
var trial_data = jsPsych.data.getData({trial_index: global_trial_index})[0];
// handle callback at plugin level
if (typeof current_trial.on_finish === 'function') {
current_trial.on_finish(trial_data);
}
// handle callback at whole-experiment level
opts.on_trial_finish(trial_data);
// wait for iti
if (typeof current_trial.timing_post_trial == 'undefined') {
if (opts.default_iti > 0) {
setTimeout(nextTrial, opts.default_iti);
} else {
nextTrial();
}
} else {
if (current_trial.timing_post_trial > 0) {
setTimeout(nextTrial, current_trial.timing_post_trial);
} else {
nextTrial();
}
}
}
core.endExperiment = function(end_message) {
timeline.end_message = end_message;
timeline.end();
jsPsych.pluginAPI.cancelAllKeyboardResponses();
jsPsych.pluginAPI.clearAllTimeouts();
core.finishTrial();
}
core.endCurrentTimeline = function() {
timeline.endActiveNode();
}
core.currentTrial = function() {
return current_trial;
};
core.initSettings = function() {
return opts;
};
core.currentTimelineNodeID = function() {
return timeline.activeID();
};
core.timelineVariable = function(varname){
return timeline.timelineVariable(varname);
}
core.addNodeToEndOfTimeline = function(new_timeline, preload_callback){
timeline.insert(new_timeline);
if(opts.auto_preload){
jsPsych.pluginAPI.autoPreload(timeline, preload_callback);
} else {
preload_callback();
}
}
core.pauseExperiment = function(){
paused = true;
}
core.resumeExperiment = function(){
paused = false;
if(waiting){
waiting = false;
nextTrial();
}
}
function TimelineNode(parameters, parent, relativeID) {
// a unique ID for this node, relative to the parent
var relative_id;
// store the parent for this node
var parent_node;
// parameters for the trial if the node contains a trial
var trial_parameters;
// parameters for nodes that contain timelines
var timeline_parameters;
// stores trial information on a node that contains a timeline
// used for adding new trials
var node_trial_data;
// track progress through the node
var progress = {
current_location: -1, // where on the timeline (which timelinenode)
current_variable_set: 0, // which set of variables to use from timeline_variables
current_repetition: 0, // how many times through the variable set on this run of the node
current_iteration: 0, // how many times this node has been revisited
done: false
}
// reference to self
var self = this;
// recursively get the next trial to run.
// if this node is a leaf (trial), then return the trial.
// otherwise, recursively find the next trial in the child timeline.
this.trial = function() {
if (typeof timeline_parameters == 'undefined') {
// returns a clone of the trial_parameters to
// protect functions.
return $.extend(true, {}, trial_parameters);
} else {
if (progress.current_location >= timeline_parameters.timeline.length) {
return null;
} else {
return timeline_parameters.timeline[progress.current_location].trial();
}
}
}
this.markCurrentTrialComplete = function() {
if(typeof timeline_parameters == 'undefined'){
progress.done = true;
} else {
timeline_parameters.timeline[progress.current_location].markCurrentTrialComplete();
}
}
this.nextRepetiton = function() {
this.setTimelineVariablesOrder();
progress.current_location = -1;
progress.current_variable_set = 0;
progress.current_repetition++;
for (var i = 0; i < timeline_parameters.timeline.length; i++) {
timeline_parameters.timeline[i].reset();
}
}
// set the order for going through the timeline variables array
// TODO: this is where all the sampling options can be implemented
this.setTimelineVariablesOrder = function() {
var order = [];
for(var i=0; i<timeline_parameters.timeline_variables.length; i++){
order.push(i);
}
if(typeof timeline_parameters.sample !== 'undefined'){
if(timeline_parameters.sample.type == 'custom'){
order = timeline_parameters.sample.fn(order);
} else if(timeline_parameters.sample.type == 'with-replacement'){
order = jsPsych.randomization.sample(order, timeline_parameters.sample.size, true);
} else if(timeline_parameters.sample.type == 'without-replacement'){
order = jsPsych.randomization.sample(order, timeline_parameters.sample.size, false);
}
}
if(timeline_parameters.randomize_order) {
order = jsPsych.randomization.shuffle(order);
}
progress.order = order;
}
// next variable set
this.nextSet = function() {
progress.current_location = -1;
progress.current_variable_set++;
for (var i = 0; i < timeline_parameters.timeline.length; i++) {
timeline_parameters.timeline[i].reset();
}
}
// update the current trial node to be completed
// returns true if the node is complete after advance (all subnodes are also complete)
// returns false otherwise
this.advance = function() {
// first check to see if done
if (progress.done) {
return true;
}
// if node has not started yet (progress.current_location == -1),
// then try to start the node.
if (progress.current_location == -1) {
// check for conditonal function on nodes with timelines
if (typeof timeline_parameters != 'undefined') {
if (typeof timeline_parameters.conditional_function !== 'undefined') {
var conditional_result = timeline_parameters.conditional_function();
// if the conditional_function() returns false, then the timeline
// doesn't run and is marked as complete.
if (conditional_result == false) {
progress.done = true;
return true;
}
// if the conditonal_function() returns true, then the node can start
else {
progress.current_location = 0;
}
}
// if there is no conditional_function, then the node can start
else {
progress.current_location = 0;
}
}
// if the node does not have a timeline, then it can start
progress.current_location = 0;
// call advance again on this node now that it is pointing to a new location
return this.advance();
}
// if this node has a timeline, propogate down to the current trial.
if (typeof timeline_parameters !== 'undefined') {
var have_node_to_run = false;
// keep incrementing the location in the timeline until one of the nodes reached is incomplete
while (progress.current_location < timeline_parameters.timeline.length && have_node_to_run == false) {
// check to see if the node currently pointed at is done
var target_complete = timeline_parameters.timeline[progress.current_location].advance();
if (!target_complete) {
have_node_to_run = true;
return false;
} else {
progress.current_location++;
}
}
// if we've reached the end of the timeline (which, if the code is here, we have)
// there are a few steps to see what to do next...
// first, check the timeline_variables to see if we need to loop through again
// with a new set of variables
if (progress.current_variable_set < progress.order.length - 1) {
// reset the progress of the node to be with the new set
this.nextSet();
// then try to advance this node again.
return this.advance();
}
// if we're all done with the timeline_variables, then check to see if there are more repetitions
else if (progress.current_repetition < timeline_parameters.repetitions - 1) {
this.nextRepetiton();
return this.advance();
}
// if we're all done with the repetitions, check if there is a loop function.
else if (typeof timeline_parameters.loop_function !== 'undefined') {
if (timeline_parameters.loop_function(this.generatedData())) {
this.reset(); // TODO: fix this probably...
return parent_node.advance();
} else {
progress.done = true;
return true;
}
}
// no more loops on this timeline, we're done!
else {
progress.done = true;
return true;
}
}
}
// check the status of the done flag
this.isComplete = function() {
return progress.done;
}
// getter method for timeline variables
this.getTimelineVariableValue = function(variable_name){
if(typeof timeline_parameters == 'undefined'){
return undefined;
}
var v = timeline_parameters.timeline_variables[progress.order[progress.current_variable_set]][variable_name];
return v;
}
// recursive upward search for timeline variables
this.findTimelineVariable = function(variable_name){
var v = this.getTimelineVariableValue(variable_name);
if(typeof v == 'undefined'){
if(typeof parent_node !== 'undefined'){
return parent_node.findTimelineVariable(variable_name);
} else {
return undefined;
}
} else {
return v;
}
}
// recursive downward search for active trial to extract timeline variable
this.timelineVariable = function(variable_name){
if(typeof timeline_parameters == 'undefined'){
return this.findTimelineVariable(variable_name);
} else {
return timeline_parameters.timeline[progress.current_location].timelineVariable(variable_name);
}
}
// recursively get the number of **trials** contained in the timeline
// assuming that while loops execute exactly once and if conditionals
// always run
this.length = function() {
var length = 0;
if (typeof timeline_parameters !== 'undefined') {
for (var i = 0; i < timeline_parameters.timeline.length; i++) {
length += timeline_parameters.timeline[i].length();
}
} else {
return 1;
}
return length;
}
// return the percentage of trials completed, grouped at the first child level
// counts a set of trials as complete when the child node is done
this.percentComplete = function() {
var total_trials = this.length();
var completed_trials = 0;
for (var i = 0; i < timeline_parameters.timeline.length; i++) {
if (timeline_parameters.timeline[i].isComplete()) {
completed_trials += timeline_parameters.timeline[i].length();
}
}
return (completed_trials / total_trials * 100)
}
// resets the node and all subnodes to original state
// but increments the current_iteration counter
this.reset = function() {
progress.current_location = -1;
progress.current_repetition = 0;
progress.current_variable_set = 0;
progress.current_iteration++;
progress.done = false;
if (typeof timeline_parameters != 'undefined') {
for (var i = 0; i < timeline_parameters.timeline.length; i++) {
timeline_parameters.timeline[i].reset();
}
}
}
// mark this node as finished
this.end = function() {
progress.done = true;
}
// recursively end whatever sub-node is running the current trial
this.endActiveNode = function() {
if (typeof timeline_parameters == 'undefined') {
this.end();
parent_node.end();
} else {
timeline_parameters.timeline[progress.current_location].endActiveNode();
}
}
// get a unique ID associated with this node
// the ID reflects the current iteration through this node.
this.ID = function() {
var id = "";
if (typeof parent_node == 'undefined') {
return "0." + progress.current_iteration;
} else {
id += parent_node.ID() + "-";
id += relative_id + "." + progress.current_iteration;
return id;
}
}
// get the ID of the active trial
this.activeID = function() {
if (typeof timeline_parameters == 'undefined') {
return this.ID();
} else {
return timeline_parameters.timeline[progress.current_location].activeID();
}
}
// get all the data generated within this node
this.generatedData = function() {
return jsPsych.data.getDataByTimelineNode(this.ID());
}
// get all the trials of a particular type
this.trialsOfType = function(type) {
if (typeof timeline_parameters == 'undefined'){
if (trial_parameters.type == type) {
return trial_parameters;
} else {
return [];
}
} else {
var trials = [];
for (var i = 0; i < timeline_parameters.timeline.length; i++) {
var t = timeline_parameters.timeline[i].trialsOfType(type);
trials = trials.concat(t);
}
return trials;
}
}
// add new trials to end of this timeline
this.insert = function(parameters){
if(typeof timeline_parameters == 'undefined'){
console.error('Cannot add new trials to a trial-level node.');
} else {
timeline_parameters.timeline.push(
new TimelineNode($.extend(true, {}, node_trial_data, parameters), self, timeline_parameters.timeline.length)
);
}
}
// constructor
var _construct = function() {
// store a link to the parent of this node
parent_node = parent;
// create the ID for this node
if (typeof parent == 'undefined') {
relative_id = 0;
} else {
relative_id = relativeID;
}
// check if there is a timeline parameter
// if there is, then this node has its own timeline
if (typeof parameters.timeline !== 'undefined') {
// create timeline properties
timeline_parameters = {
timeline: [],
loop_function: parameters.loop_function,
conditional_function: parameters.conditional_function,
sample: parameters.sample,
randomize_order: typeof parameters.randomize_order == 'undefined' ? false : parameters.randomize_order,
repetitions: typeof parameters.repetitions == 'undefined' ? 1 : parameters.repetitions,
timeline_variables: typeof parameters.timeline_variables == 'undefined' ? [{}] : parameters.timeline_variables
};
self.setTimelineVariablesOrder();
// extract all of the node level data and parameters
var node_data = $.extend(true, {}, parameters);
delete node_data.timeline;
delete node_data.conditional_function;
delete node_data.loop_function;
delete node_data.randomize_order;
delete node_data.repetitions;
delete node_data.timeline_variables;
delete node_data.sample;
node_trial_data = node_data; // store for later...
// create a TimelineNode for each element in the timeline
for (var i = 0; i < parameters.timeline.length; i++) {
timeline_parameters.timeline.push(new TimelineNode($.extend(true, {}, node_data, parameters.timeline[i]), self, i));
}
}
// if there is no timeline parameter, then this node is a trial node
else {
// check to see if a valid trial type is defined
var trial_type = parameters.type;
if (typeof trial_type == 'undefined') {
console.error('Trial level node is missing the "type" parameter. The parameters for the node are: ' + JSON.stringify(parameters));
} else if (typeof jsPsych.plugins[trial_type] == 'undefined') {
console.error('No plugin loaded for trials of type "' + trial_type + '"');
}
// create a deep copy of the parameters for the trial
trial_parameters = $.extend(true, {}, parameters);
}
}();
}
function startExperiment() {
loaded = true;
var fullscreen = opts.fullscreen;
// fullscreen setup
if (fullscreen) {
// check if keys are allowed in fullscreen mode
var keyboardNotAllowed = typeof Element !== 'undefined' && 'ALLOW_KEYBOARD_INPUT' in Element;
if (keyboardNotAllowed) {
go();
} else {
DOM_target.append('<div style=""><p>The experiment will launch in fullscreen mode when you click the button below.</p><button id="jspsych-fullscreen-btn" class="jspsych-btn">Launch Experiment</button></div>');
$('#jspsych-fullscreen-btn').on('click', function() {
var element = document.documentElement;
if (element.requestFullscreen) {
element.requestFullscreen();
} else if (element.mozRequestFullScreen) {
element.mozRequestFullScreen();
} else if (element.webkitRequestFullscreen) {
element.webkitRequestFullscreen();
} else if (element.msRequestFullscreen) {
element.msRequestFullscreen();
}
$('#jspsych-fullscreen-btn').off('click');
DOM_target.html('');
setTimeout(go, 1000);
});
}
} else {
go();
}
function go() {
// show progress bar if requested
if (opts.show_progress_bar === true) {
drawProgressBar();
}
// record the start time
exp_start_time = new Date();
// begin!
timeline.advance();
doTrial(timeline.trial());
}
}
function finishExperiment() {
opts.on_finish(jsPsych.data.getData());
if(typeof timeline.end_message !== 'undefined'){
DOM_target.html(timeline.end_message);
}
if (document.exitFullscreen) {
document.exitFullscreen();
} else if (document.msExitFullscreen) {
document.msExitFullscreen();
} else if (document.mozCancelFullScreen) {
document.mozCancelFullScreen();
} else if (document.webkitExitFullscreen) {
document.webkitExitFullscreen();
}
}
function nextTrial() {
// if experiment is paused, don't do anything.
if(paused) {
waiting = true;
return;
}
global_trial_index++;
current_trial_finished = false;
// advance timeline
timeline.markCurrentTrialComplete();
var complete = timeline.advance();
// update progress bar if shown
if (opts.show_progress_bar === true) {
updateProgressBar();
}
// check if experiment is over
if (complete) {
finishExperiment();
return;
}
doTrial(timeline.trial());
}
function doTrial(trial) {
current_trial = trial;
// call experiment wide callback
opts.on_trial_start();
// check if trial has it's own display element
var display_element = DOM_target;
if(typeof trial.display_element !== 'undefined'){
display_element = trial.display_element;
}
// execute trial method
jsPsych.plugins[trial.type].trial(display_element, trial);
}
function loadFail(){
DOM_target.html('<p>The experiment failed to load.</p>');
}
function checkExclusions(exclusions, success, fail){
var clear = true;
// MINIMUM SIZE
if(typeof exclusions.min_width !== 'undefined' || typeof exclusions.min_height !== 'undefined'){
var mw = typeof exclusions.min_width !== 'undefined' ? exclusions.min_width : 0;
var mh = typeof exclusions.min_height !== 'undefined' ? exclusions.min_height : 0;
var w = window.innerWidth;
var h = window.innerHeight;
if(w < mw || h < mh){
clear = false;
var interval = setInterval(function(){
var w = window.innerWidth;
var h = window.innerHeight;
if(w < mw || h < mh){
var msg = '<p>Your browser window is too small to complete this experiment. '+
'Please maximize the size of your browser window. If your browser window is already maximized, '+
'you will not be able to complete this experiment.</p>'+
'<p>The minimum width is '+mw+'px. Your current width is '+w+'px.</p>'+
'<p>The minimum height is '+mh+'px. Your current height is '+h+'px.</p>';
core.getDisplayElement().html(msg);
} else {
clearInterval(interval);
core.getDisplayElement().empty();
checkExclusions(exclusions, success, fail);
}
}, 100);
return; // prevents checking other exclusions while this is being fixed
}
}
// WEB AUDIO API
if(typeof exclusions.audio !== 'undefined' && exclusions.audio) {
if(window.hasOwnProperty('AudioContext') || window.hasOwnProperty('webkitAudioContext')){
// clear
} else {
clear = false;
var msg = '<p>Your browser does not support the WebAudio API, which means that you will not '+
'be able to complete the experiment.</p><p>Browsers that support the WebAudio API include '+
'Chrome, Firefox, Safari, and Edge.</p>';
core.getDisplayElement().html(msg);
fail();
return;
}
}
// GO?
if(clear){ success(); }
}
function drawProgressBar() {
$('.jspsych-display-element').prepend(
'<div id="jspsych-progressbar-container">'+
'<span>Completion Progress</span>'+
'<div id="jspsych-progressbar-outer">'+
'<div id="jspsych-progressbar-inner"></div>'+
'</div></div>'
);
}
function updateProgressBar() {
var progress = jsPsych.progress();
$('#jspsych-progressbar-inner').css('width', progress.percent_complete + "%");
}
return core;
})();
jsPsych.plugins = {
// enumerate possible parameter types for plugins
parameterType: {
BOOL: 0,
STRING: 1,
INT: 2,
FLOAT: 3,
FUNCTION: 4,
KEYCODE: 5,
SELECT: 6
}
};
jsPsych.data = (function() {
var module = {};
// data storage object
var allData = [];
// browser interaction event data
var interactionData = [];
// data properties for all trials
var dataProperties = {};
// ignored data fields
var ignoredProperties = [];
// cache the query_string
var query_string;
module.getData = function(filters) {
var data_clone = $.extend(true, [], allData); // deep clone
if(typeof filters == 'undefined'){
return data_clone;
}
// [{p1: v1, p2:v2}, {p1:v2}]
// {p1: v1}
if(!Array.isArray(filters)){
var f = $.extend(true, [], [filters]);
} else {
var f = $.extend(true, [], filters);
}
var filtered_data = [];
for(var x=0; x < data_clone.length; x++){
var keep = false;
for(var i=0; i<f.length; i++){
var match = true;
var keys = Object.keys(f[i]);
for(var k=0; k<keys.length; k++){
if(typeof data_clone[x][keys[k]] !== 'undefined' && data_clone[x][keys[k]] == f[i][keys[k]]){
// matches on this key!
} else {
match = false;
}
}
if(match) { keep = true; break; } // can break because each filter is OR.
}
if(keep){
filtered_data.push(data_clone[x]);
}
}
return filtered_data;
};
module.getInteractionData = function() {
return $.extend(true, [], interactionData);
}
module.write = function(data_object) {
var progress = jsPsych.progress();
var trial = jsPsych.currentTrial();
//var trial_opt_data = typeof trial.data == 'function' ? trial.data() : trial.data;
var default_data = {
'trial_type': trial.type,
'trial_index': progress.current_trial_global,
'time_elapsed': jsPsych.totalTime(),
'internal_node_id': jsPsych.currentTimelineNodeID()
};
var ext_data_object = $.extend({}, data_object, trial.data, default_data, dataProperties);
for(var i in ignoredProperties){
delete ext_data_object[ignoredProperties[i]];
}
allData.push(ext_data_object);
var initSettings = jsPsych.initSettings();
initSettings.on_data_update(ext_data_object);
};
module.addProperties = function(properties) {
// first, add the properties to all data that's already stored
for (var i = 0; i < allData.length; i++) {
for (var key in properties) {
allData[i][key] = properties[key];
}
}
// now add to list so that it gets appended to all future data
dataProperties = $.extend({}, dataProperties, properties);
};
module.ignore = function(properties) {
// first, remove the properties from all data that's already stored
for (var i = 0; i < allData.length; i++) {
for (var j in properties) {
delete allData[i][properties[j]];
}
}
// now add to list so that it gets appended to all future data
ignoredProperties = ignoredProperties.concat(properties);
};
module.addDataToLastTrial = function(data) {
if (allData.length == 0) {
throw new Error("Cannot add data to last trial - no data recorded so far");
}
allData[allData.length - 1] = $.extend({}, allData[allData.length - 1], data);
}
module.getDataAsCSV = function(filters) {
var dataObj = module.getData(filters);
return JSON2CSV(dataObj);
};
module.getDataAsJSON = function(filters) {
var dataObj = module.getData(filters);
return JSON.stringify(dataObj);
};
module.localSave = function(filename, format, filters) {
var data_string;
if (format == 'JSON' || format == 'json') {
data_string = module.getDataAsJSON(filters)
} else if (format == 'CSV' || format == 'csv') {
data_string = module.getDataAsCSV(filters);
} else {