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jspsych.js
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/**
* jspsych.js
* Josh de Leeuw
*
* documentation: https://github.com/jodeleeuw/jsPsych/wiki
*
**/
(function($) {
jsPsych = (function() {
var core = {};
//
// private variables
//
// options
var opts = {};
// exp structure
var root_chunk;
// flow control
var curr_chunk = 0;
var global_trial_index = 0;
var current_trial = {};
// target DOM element
var DOM_target;
// time that the experiment began
var exp_start_time;
//
// public methods
//
core.init = function(options) {
// reset variables
root_chunk = {};
opts = {};
curr_chunk = 0;
// check if there is a body element on the page
var default_display_element = $('body');
if (default_display_element.length === 0) {
$(document.documentElement).append($('<body>'));
default_display_element = $('body');
}
var defaults = {
'display_element': default_display_element,
'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;
},
'show_progress_bar': false
};
// override default options if user specifies an option
opts = $.extend({}, defaults, options);
// set target
DOM_target = opts.display_element;
// add CSS class to DOM_target
DOM_target.addClass('jspsych-display-element');
// create experiment structure
root_chunk = parseExpStructure(opts.experiment_structure);
startExperiment();
};
core.progress = function() {
var obj = {
"total_trials": root_chunk.length(),
"current_trial_global": global_trial_index,
"current_trial_local": root_chunk.currentTrialLocalIndex(),
"total_chunks": root_chunk.timeline.length,
"current_chunk": root_chunk.currentTimelineLocation
};
return obj;
};
core.startTime = function() {
return exp_start_time;
};
core.totalTime = function() {
return (new Date()).getTime() - exp_start_time.getTime();
};
core.preloadImages = function(images, callback_complete, callback_load) {
// flatten the images array
images = flatten(images);
var n_loaded = 0;
var loadfn = (typeof callback_load === 'undefined') ? function() {} : callback_load;
var finishfn = (typeof callback_complete === 'undefined') ? function() {} : callback_complete;
for (var i = 0; i < images.length; i++) {
var img = new Image();
img.onload = function() {
n_loaded++;
loadfn(n_loaded);
if (n_loaded == images.length) {
finishfn();
}
};
img.src = images[i];
}
};
core.getDisplayElement = function() {
return DOM_target;
};
core.finishTrial = function(){
// logic to advance to next trial?
// handle callback at plugin level
if (typeof current_trial.on_finish === 'function') {
current_trial.on_finish(); // TODO: pass in data
}
// handle callback at whole-experiment level
opts.on_trial_finish();
global_trial_index++;
// advance chunk
root_chunk.advance();
// update progress bar if shown
if (opts.show_progress_bar === true) {
updateProgressBar();
}
// check if experiment is over
if(root_chunk.isComplete()){
finishExperiment();
return;
}
doTrial(root_chunk.next());
};
core.currentTrial = function(){
return current_trial;
};
core.initSettings = function(){
return opts;
};
core.currentChunkID = function(){
return root_chunk.activeChunkID();
};
function parseExpStructure(experiment_structure) {
return createExperimentChunk({
chunk_type: 'root',
timeline: experiment_structure
});
}
function createExperimentChunk(chunk_definition, parent_chunk, relative_id){
var chunk = {};
chunk.timeline = parseChunkDefinition(chunk_definition.timeline);
chunk.parentChunk = parent_chunk;
chunk.relID = relative_id;
chunk.type = chunk_definition.chunk_type; // root, linear, while, if
chunk.currentTimelineLocation = 0;
// this is the current trial since the last time the chunk was reset
chunk.currentTrialInTimeline = 0;
// this is the current trial since the chunk started (incl. resets)
chunk.currentTrialInChunk = 0;
chunk.iteration = 0;
chunk.length = function(){
// this will recursively get the number of trials on this chunk's timeline
var n = 0;
for(var i=0; i<this.timeline.length; i++){
n += this.timeline[i].length;
}
return n;
};
chunk.activeChunkID = function(){
if(this.timeline[this.currentTimelineLocation].type === 'block'){
return this.chunkID();
} else {
return this.timeline[this.currentTimelineLocation].activeChunkID();
}
};
chunk.chunkID = function() {
if(typeof this.parentChunk === 'undefined') {
return 0 + "-" + this.iteration;
} else {
return this.parentChunk.chunkID() + "." + this.relID + "-" + this.iteration;
}
};
chunk.next = function() {
// return the next trial in the block to be run
if(this.isComplete()){
throw new Error('Tried to get completed trial from chunk that is finished.');
} else {
return this.timeline[this.currentTimelineLocation].next();
}
};
chunk.advance = function(){
// increment the current trial in the chunk
this.timeline[this.currentTimelineLocation].advance();
while(this.currentTimelineLocation < this.timeline.length &&
this.timeline[this.currentTimelineLocation].isComplete()){
this.currentTimelineLocation++;
}
this.currentTrialInTimeline++;
this.currentTrialInChunk++;
};
chunk.isComplete = function() {
// return true if the chunk is done running trials
// return false otherwise
// linear chunks just go through the timeline in order and are
// done when each trial has been completed once
// the root chunk is a special case of the linear chunk
if(this.type == 'linear' || this.type == 'root'){
if (this.currentTimelineLocation >= this.timeline.length) { return true; }
else { return false; }
}
// while chunks play the block again as long as the continue_function
// returns true
else if(this.type == 'while'){
if (this.currentTimelineLocation >= this.timeline.length) {
if(chunk_definition.continue_function(this.generatedData())){
this.reset();
return false;
} else {
return true;
}
} else {
return false;
}
}
else if(this.type == 'if'){
if(this.currentTimelineLocation >= this.timeline.length){
return true;
}
if(this.currentTimelineLocation == 0){
if(chunk_definition.conditional_function()){
return false;
} else {
return true;
}
} else {
return false;
}
}
};
chunk.currentTrialLocalIndex = function() {
if(this.currentTimelineLocation >= this.timeline.length) {
return -1;
}
if(this.timeline[this.currentTimelineLocation].type == 'block'){
return this.timeline[this.currentTimelineLocation].trial_idx;
} else {
return this.timeline[this.currentTimelineLocation].currentTrialLocalIndex();
}
};
chunk.generatedData = function() {
// return an array containing all of the data generated by this chunk for this iteration
var d = jsPsych.data.getTrialsFromChunk(this.chunkID());
return d;
};
chunk.reset = function() {
this.currentTimelineLocation = 0;
this.currentTrialInTimeline = 0;
this.iteration++;
for(var i = 0; i < this.timeline.length; i++){
this.timeline[i].reset();
}
};
function parseChunkDefinition(chunk_timeline){
var timeline = [];
for (var i = 0; i < chunk_timeline.length; i++) {
var ct = chunk_timeline[i].chunk_type;
if(typeof ct !== 'undefined') {
if($.inArray(ct, ["linear", "while", "if"]) > -1){
timeline.push(createExperimentChunk(chunk_timeline[i], chunk, i));
} else {
throw new Error('Invalid experiment structure definition. Element of the experiment_structure array has an invalid chunk_type property');
}
} else {
// create a terminal block ...
// check to make sure plugin is loaded
var plugin_name = chunk_timeline[i].type;
if (typeof jsPsych[plugin_name] === 'undefined') {
throw new Error("Failed attempt to create trials using plugin type " + plugin_name + ". Is the plugin loaded?");
}
var trials = jsPsych[plugin_name].create(chunk_timeline[i]);
// add options that are generic to all plugins
trials = addGenericTrialOptions(trials, chunk_timeline[i]);
// setting default values for repetitions and randomize_order
var randomize_order = (typeof chunk_timeline[i].randomize_order === 'undefined') ? false : chunk_timeline[i].randomize_order;
var repetitions = (typeof chunk_timeline[i].repetitions === 'undefined') ? 1 : chunk_timeline[i].repetitions;
for(var j = 0; j < repetitions; j++) {
timeline.push(createBlock(trials, randomize_order));
}
}
}
return timeline;
}
return chunk;
}
function createBlock(trial_list, randomize_order) {
var block = {
trial_idx: 0,
trials: trial_list,
type: 'block',
randomize_order: randomize_order,
next: function() {
// stuff that happens when the block is running from the start
if(this.trial_idx === 0){
if(this.randomize_order){
this.trials = jsPsych.randomization.repeat(this.trials, 1, false);
}
}
var curr_trial = this.trials[this.trial_idx];
return curr_trial;
},
isComplete: function() {
if(this.trial_idx >= this.trials.length){
return true;
} else {
return false;
}
},
advance: function() {
this.trial_idx++;
},
reset: function() {
this.trial_idx = 0;
},
length: trial_list.length
};
return block;
}
function startExperiment() {
// show progress bar if requested
if (opts.show_progress_bar === true) {
drawProgressBar();
}
// record the start time
exp_start_time = new Date();
// begin!
doTrial(root_chunk.next());
}
function addGenericTrialOptions(trials_arr, opts) {
// modify this list to add new generic parameters
var genericParameters = ['type', 'data', 'timing_post_trial', 'on_finish'];
// default values for generics above
var defaultValues = [, , 1000, ];
for (var i = 0; i < genericParameters.length; i++) {
trials_arr = addParamToTrialsArr(trials_arr, opts[genericParameters[i]], genericParameters[i], defaultValues[i]);
}
return trials_arr;
}
function addParamToTrialsArr(trials_arr, param, param_name, default_value) {
if (typeof default_value !== 'undefined') {
param = (typeof param === 'undefined') ? default_value : param;
}
if (typeof param !== 'undefined') {
if (Array.isArray(param)) {
// check if data object array is the same length as the number of trials
if (param.length != trials_arr.length) {
throw new Error('Invalid specification of parameter ' + param_name + ' in plugin type ' + trials_arr[i].type + '. Length of parameter array does not match the number of trials in the block.');
} else {
for (var i = 0; i < trials_arr.length; i++) {
trials_arr[i][param_name] = param[i];
}
}
} else {
// use the same data object for each trial
for (var i = 0; i < trials_arr.length; i++) {
trials_arr[i][param_name] = param;
}
}
}
return trials_arr;
}
function finishExperiment() {
opts.on_finish(jsPsych.data.getData());
}
function doTrial(trial) {
current_trial = trial;
// call experiment wide callback
opts.on_trial_start();
// execute trial method
jsPsych[trial.type].trial(DOM_target, trial);
}
function drawProgressBar() {
$('body').prepend($('<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();
var percentComplete = 100 * ((progress.current_chunk) / progress.total_chunks);
$('#jspsych-progressbar-inner').css('width', percentComplete + "%");
}
return core;
})();
jsPsych.data = (function() {
var module = {};
// data storage object
var allData = [];
module.getData = function() {
return $.extend(true, [], allData); // deep clone
};
module.write = function(data_object) {
var progress = jsPsych.progress();
var trial = jsPsych.currentTrial();
var default_data = {
'trial_type': trial.type,
'trial_index': progress.current_trial_local,
'trial_index_global': progress.current_trial_global,
'time_elapsed': jsPsych.totalTime(),
'internal_chunk_id': jsPsych.currentChunkID()
};
var ext_data_object = $.extend({}, data_object, default_data);
allData.push(ext_data_object);
var initSettings = jsPsych.initSettings();
initSettings.on_data_update(ext_data_object); //TODO: FIX callback?
};
module.dataAsCSV = function(append_data) {
var dataObj = module.getData();
return JSON2CSV(flattenData(dataObj, append_data));
};
module.localSave = function(filename, format, append_data) {
var data_string;
if (format == 'JSON' || format == 'json') {
data_string = JSON.stringify(flattenData(module.getData(), append_data));
} else if (format == 'CSV' || format == 'csv') {
data_string = module.dataAsCSV(append_data);
} else {
throw new Error('invalid format specified for jsPsych.data.localSave');
}
saveTextToFile(data_string, filename);
};
module.getTrialsOfType = function(trial_type) {
var data = module.getData();
data = flatten(data);
var trials = [];
for (var i = 0; i < data.length; i++) {
if (data[i].trial_type == trial_type) {
trials.push(data[i]);
}
}
return trials;
};
module.getTrialsFromChunk = function(chunk_id) {
var data = module.getData();
data = flatten(data);
var trials = [];
for (var i = 0; i < data.length; i++) {
if (data[i].internal_chunk_id.slice(0, chunk_id.length) === chunk_id) {
trials.push(data[i]);
}
}
return trials;
};
module.getLastTrialData = function() {
if(allData.length == 0){
return {};
}
return allData[allData.length-1];
};
module.getLastChunkData = function() {
var lasttrial = module.getLastTrialData();
var chunk_id = lasttrial.internal_chunk_id;
if(typeof chunk_id === 'undefined') {
return [];
} else {
var lastchunkdata = module.getTrialsFromChunk(chunk_id);
return lastchunkdata;
}
}
module.displayData = function(format) {
format = (typeof format === 'undefined') ? "json" : format.toLowerCase();
if (format != "json" && format != "csv") {
console.log('Invalid format declared for displayData function. Using json as default.');
format = "json";
}
var data_string;
if (format == 'json') {
data_string = JSON.stringify(flattenData(module.getData()), undefined, 1);
} else {
data_string = module.dataAsCSV();
}
var display_element = jsPsych.getDisplayElement();
display_element.append($('<pre>', {
html: data_string
}));
};
// private function to save text file on local drive
function saveTextToFile(textstr, filename) {
var blobToSave = new Blob([textstr], {
type: 'text/plain'
});
var blobURL = "";
if (typeof window.webkitURL !== 'undefined') {
blobURL = window.webkitURL.createObjectURL(blobToSave);
} else {
blobURL = window.URL.createObjectURL(blobToSave);
}
var display_element = jsPsych.getDisplayElement();
display_element.append($('<a>', {
id: 'jspsych-download-as-text-link',
href: blobURL,
css: {
display: 'none'
},
download: filename,
html: 'download file'
}));
$('#jspsych-download-as-text-link')[0].click();
}
//
// A few helper functions to handle data format conversion
//
function flattenData(data_object, append_data) {
append_data = (typeof append_data === undefined) ? {} : append_data;
var trials = [];
// loop through data_object
for (var i = 0; i < data_object.length; i++) {
for (var j = 0; j < data_object[i].length; j++) {
var data = $.extend({}, data_object[i][j], append_data);
trials.push(data);
}
}
return trials;
}
// this function based on code suggested by StackOverflow users:
// http://stackoverflow.com/users/64741/zachary
// http://stackoverflow.com/users/317/joseph-sturtevant
function JSON2CSV(objArray) {
var array = typeof objArray != 'object' ? JSON.parse(objArray) : objArray;
var line = '';
var result = '';
var columns = [];
var i = 0;
for (var j = 0; j < array.length; j++) {
for (var key in array[j]) {
var keyString = key + "";
keyString = '"' + keyString.replace(/"/g, '""') + '",';
if ($.inArray(key, columns) == -1) {
columns[i] = key;
line += keyString;
i++;
}
}
}
line = line.slice(0, -1);
result += line + '\r\n';
for (var i = 0; i < array.length; i++) {
var line = '';
for (var j = 0; j < columns.length; j++) {
var value = (typeof array[i][columns[j]] === 'undefined') ? '' : array[i][columns[j]];
var valueString = value + "";
line += '"' + valueString.replace(/"/g, '""') + '",';
}
line = line.slice(0, -1);
result += line + '\r\n';
}
return result;
}
return module;
})();
jsPsych.turk = (function() {
var module = {};
// core.turkInfo gets information relevant to mechanical turk experiments. returns an object
// containing the workerID, assignmentID, and hitID, and whether or not the HIT is in
// preview mode, meaning that they haven't accepted the HIT yet.
module.turkInfo = function() {
var turk = {};
var param = function(url, name) {
name = name.replace(/[\[]/, "\\\[").replace(/[\]]/, "\\\]");
var regexS = "[\\?&]" + name + "=([^&#]*)";
var regex = new RegExp(regexS);
var results = regex.exec(url);
return (results == null) ? "" : results[1];
};
var src = param(window.location.href, "assignmentId") ? window.location.href : document.referrer;
var keys = ["assignmentId", "hitId", "workerId", "turkSubmitTo"];
keys.map(
function(key) {
turk[key] = unescape(param(src, key));
});
turk.previewMode = (turk.assignmentId == "ASSIGNMENT_ID_NOT_AVAILABLE");
turk.outsideTurk = (!turk.previewMode && turk.hitId === "" && turk.assignmentId == "" && turk.workerId == "")
turk_info = turk;
return turk;
};
// core.submitToTurk will submit a MechanicalTurk ExternalHIT type
module.submitToTurk = function(data) {
var turkInfo = jsPsych.turk.turkInfo();
var assignmentId = turkInfo.assignmentId;
var turkSubmitTo = turkInfo.turkSubmitTo;
if (!assignmentId || !turkSubmitTo) return;
var dataString = [];
for (var key in data) {
if (data.hasOwnProperty(key)) {
dataString.push(key + "=" + escape(data[key]));
}
}
dataString.push("assignmentId=" + assignmentId);
var url = turkSubmitTo + "/mturk/externalSubmit?" + dataString.join("&");
window.location.href = url;
};
return module;
})();
jsPsych.randomization = (function() {
var module = {};
module.repeat = function(array, repetitions, unpack) {
var arr_isArray = Array.isArray(array);
var rep_isArray = Array.isArray(repetitions);
// if array is not an array, then we just repeat the item
if (!arr_isArray) {
if (!rep_isArray) {
array = [array];
repetitions = [repetitions];
} else {
repetitions = [repetitions[0]];
console.log('Unclear parameters given to randomizeSimpleSample. Multiple set sizes specified, but only one item exists to sample. Proceeding using the first set size.');
}
} else {
if (!rep_isArray) {
var reps = [];
for (var i = 0; i < array.length; i++) {
reps.push(repetitions);
}
repetitions = reps;
} else {
if (array.length != repetitions.length) {
// throw warning if repetitions is too short,
// throw warning if too long, and then use the first N
}
}
}
// should be clear at this point to assume that array and repetitions are arrays with == length
var allsamples = [];
for (var i = 0; i < array.length; i++) {
for (var j = 0; j < repetitions[i]; j++) {
allsamples.push(array[i]);
}
}
var out = shuffle(allsamples);
if (unpack) {
out = unpackArray(out);
}
return shuffle(out);
}
module.factorial = function(factors, repetitions, unpack) {
var factorNames = Object.keys(factors);
var factor_combinations = [];
for (var i = 0; i < factors[factorNames[0]].length; i++) {
factor_combinations.push({});
factor_combinations[i][factorNames[0]] = factors[factorNames[0]][i];
}
for (var i = 1; i < factorNames.length; i++) {
var toAdd = factors[factorNames[i]];
var n = factor_combinations.length;
for (var j = 0; j < n; j++) {
var base = factor_combinations[j];
for (var k = 0; k < toAdd.length; k++) {
var newpiece = {};
newpiece[factorNames[i]] = toAdd[k];
factor_combinations.push($.extend({}, base, newpiece));
}
}
factor_combinations.splice(0, n);
}
repetitions = (typeof repetitions === 'undefined') ? 1 : repetitions;
var with_repetitions = module.repeat(factor_combinations, repetitions, unpack);
return with_repetitions;
}
function unpackArray(array) {
var out = {};
for (var i = 0; i < array.length; i++) {
var keys = Object.keys(array[i]);
for (var k = 0; k < keys.length; k++) {
if (typeof out[keys[k]] === 'undefined') {
out[keys[k]] = [];
}
out[keys[k]].push(array[i][keys[k]]);
}
}
return out;
}
function shuffle(array) {
var m = array.length,
t, i;
// While there remain elements to shuffle…
while (m) {
// Pick a remaining element…
i = Math.floor(Math.random() * m--);
// And swap it with the current element.
t = array[m];
array[m] = array[i];
array[i] = t;
}
return array;
}
return module;
})();
jsPsych.pluginAPI = (function() {
// keyboard listeners
var keyboard_listeners = [];
var module = {};
module.getKeyboardResponse = function(callback_function, valid_responses, rt_method, persist) {
rt_method = (typeof rt_method === 'undefined') ? 'date' : rt_method;
if (rt_method != 'date' && rt_method != 'performance') {
console.log('Invalid RT method specified in getKeyboardResponse. Defaulting to "date" method.');
rt_method = 'date';
}
var start_time;
if (rt_method == 'date') {
start_time = (new Date()).getTime();
}
if (rt_method == 'performance') {
start_time = performance.now();
}
var listener_id;
var listener_function = function(e) {
var key_time;
if (rt_method == 'date') {
key_time = (new Date()).getTime();
}
if (rt_method == 'performance') {
key_time = performance.now();
}
var valid_response = false;
if (typeof valid_responses === 'undefined' || valid_responses.length === 0) {
valid_response = true;
}
for (var i = 0; i < valid_responses.length; i++) {
if (typeof valid_responses[i] == 'string') {
if (typeof keylookup[valid_responses[i]] !== 'undefined') {
if (e.which == keylookup[valid_responses[i]]) {
valid_response = true;
}
} else {
throw new Error('Invalid key string specified for getKeyboardResponse');
}
} else if (e.which == valid_responses[i]) {
valid_response = true;
}
}
if (valid_response) {
var after_up = function(up) {
if (up.which == e.which) {
$(document).off('keyup', after_up);
if ($.inArray(listener_id, keyboard_listeners) > -1) {
if (!persist) {
// remove keyboard listener
module.cancelKeyboardResponse(listener_id);
}
callback_function({
key: e.which,
rt: key_time - start_time
});
}
}
};
$(document).keyup(after_up);
}
};
$(document).keydown(listener_function);
// create listener id object
listener_id = {
type: 'keydown',
fn: listener_function
};
// add this keyboard listener to the list of listeners
keyboard_listeners.push(listener_id);