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jspsych.js
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/**
* jspsych.js
* Josh de Leeuw
*
* documentation: docs.jspsych.org
*
**/
window.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_container;
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;
var loadfail = false;
// storing a single webaudio context to prevent problems with multiple inits
// of jsPsych
core.webaudio_context = null;
// temporary patch for Safari
if (typeof window !== 'undefined' && window.hasOwnProperty('webkitAudioContext') && !window.hasOwnProperty('AudioContext')) {
window.AudioContext = webkitAudioContext;
}
// end patch
core.webaudio_context = (typeof window !== 'undefined' && typeof window.AudioContext !== 'undefined') ? new AudioContext() : null;
// enumerated variables for special parameter types
core.ALL_KEYS = 'allkeys';
core.NO_KEYS = 'none';
//
// public methods
//
core.init = function(options) {
if(typeof options.timeline === 'undefined'){
console.error('No timeline declared in jsPsych.init. Cannot start experiment.')
}
// reset variables
timeline = null;
global_trial_index = 0;
current_trial = {};
current_trial_finished = false;
paused = false;
waiting = false;
loaded = false;
loadfail = false;
jsPsych.data.reset();
var defaults = {
'display_element': undefined,
'on_finish': function(data) {
return undefined;
},
'on_trial_start': function(trial) {
return undefined;
},
'on_trial_finish': function() {
return undefined;
},
'on_data_update': function(data) {
return undefined;
},
'on_interaction_data_update': function(data){
return undefined;
},
'on_close': function(){
return undefined;
},
'preload_images': [],
'preload_audio': [],
'preload_video': [],
'use_webaudio': true,
'exclusions': {},
'show_progress_bar': false,
'message_progress_bar': 'Completion Progress',
'auto_update_progress_bar': true,
'auto_preload': true,
'show_preload_progress_bar': true,
'max_load_time': 60000,
'max_preload_attempts': 10,
'default_iti': 0,
'experiment_width': null
};
// override default options if user specifies an option
opts = Object.assign({}, 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 = document.querySelector('body');
if (body === null) {
document.documentElement.appendChild(document.createElement('body'));
}
// using the full page, so we need the HTML element to
// have 100% height, and body to be full width and height with
// no margin
document.querySelector('html').style.height = '100%';
document.querySelector('body').style.margin = '0px';
document.querySelector('body').style.height = '100%';
document.querySelector('body').style.width = '100%';
opts.display_element = document.querySelector('body');
} else {
// make sure that the display element exists on the page
var display;
if (opts.display_element instanceof Element) {
var display = opts.display_element;
} else {
var display = document.querySelector('#' + opts.display_element);
}
if(display === null) {
console.error('The display_element specified in jsPsych.init() does not exist in the DOM.');
} else {
opts.display_element = display;
}
}
opts.display_element.innerHTML = '<div class="jspsych-content-wrapper"><div id="jspsych-content"></div></div>';
DOM_container = opts.display_element;
DOM_target = document.querySelector('#jspsych-content');
// add tabIndex attribute to scope event listeners
opts.display_element.tabIndex = 0;
// add CSS class to DOM_target
if(opts.display_element.className.indexOf('jspsych-display-element') == -1){
opts.display_element.className += ' jspsych-display-element';
}
DOM_target.className += 'jspsych-content';
// set experiment_width if not null
if(opts.experiment_width !== null){
DOM_target.style.width = opts.experiment_width + "px";
}
// create experiment timeline
timeline = new TimelineNode({
timeline: opts.timeline
});
// initialize audio context based on options and browser capabilities
jsPsych.pluginAPI.initAudio();
// below code resets event listeners that may have lingered from
// a previous incomplete experiment loaded in same DOM.
jsPsych.pluginAPI.reset(opts.display_element);
// create keyboard event listeners
jsPsych.pluginAPI.createKeyboardEventListeners(opts.display_element);
// create listeners for user browser interaction
jsPsych.data.createInteractionListeners();
// add event for closing window
window.addEventListener('beforeunload', opts.on_close);
// 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, opts.preload_images, opts.preload_audio, opts.preload_video, opts.show_preload_progress_bar);
if(opts.max_load_time > 0){
setTimeout(function(){
if(!loaded && !loadfail){
core.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.getDisplayContainerElement = function(){
return DOM_container;
}
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.get().filter({trial_index: global_trial_index});
// for trial-level callbacks, we just want to pass in a reference to the values
// of the DataCollection, for easy access and editing.
var trial_data_values = trial_data.values()[0];
// handle callback at plugin level
if (typeof current_trial.on_finish === 'function') {
current_trial.on_finish(trial_data_values);
}
// handle callback at whole-experiment level
opts.on_trial_finish(trial_data_values);
// after the above callbacks are complete, then the data should be finalized
// for this trial. call the on_data_update handler, passing in the same
// data object that just went through the trial's finish handlers.
opts.on_data_update(trial_data_values);
// wait for iti
if (typeof current_trial.post_trial_gap === null || typeof current_trial.post_trial_gap === 'undefined') {
if (opts.default_iti > 0) {
setTimeout(nextTrial, opts.default_iti);
} else {
nextTrial();
}
} else {
if (current_trial.post_trial_gap > 0) {
setTimeout(nextTrial, current_trial.post_trial_gap);
} 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, execute){
if(execute){
return timeline.timelineVariable(varname);
} else {
return function() { return timeline.timelineVariable(varname); }
}
}
core.addNodeToEndOfTimeline = function(new_timeline, preload_callback){
timeline.insert(new_timeline);
if(typeof preload_callback !== 'undefinded'){
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();
}
}
core.loadFail = function(message){
message = message || '<p>The experiment failed to load.</p>';
loadfail = true;
DOM_target.innerHTML = message;
}
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 jsPsych.utils.deepCopy(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
this.setTimelineVariablesOrder = function() {
// check to make sure this node has variables
if(typeof timeline_parameters === 'undefined' || typeof timeline_parameters.timeline_variables === 'undefined'){
return;
}
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.sampleWithReplacement(order, timeline_parameters.sample.size, timeline_parameters.sample.weights);
} else if(timeline_parameters.sample.type == 'without-replacement'){
order = jsPsych.randomization.sampleWithoutReplacement(order, timeline_parameters.sample.size);
} else if(timeline_parameters.sample.type == 'fixed-repetitions'){
order = jsPsych.randomization.repeat(order, timeline_parameters.sample.size, false);
} else if(timeline_parameters.sample.type == 'alternate-groups'){
order = jsPsych.randomization.shuffleAlternateGroups(timeline_parameters.sample.groups, timeline_parameters.sample.randomize_group_order);
} else {
console.error('Invalid type in timeline sample parameters. Valid options for type are "custom", "with-replacement", "without-replacement", "fixed-repetitions", and "alternate-groups"');
}
}
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();
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 {
// if progress.current_location is -1, then the timeline variable is being evaluated
// in a function that runs prior to the trial starting, so we should treat that trial
// as being the active trial for purposes of finding the value of the timeline variable
var loc = Math.max(0, progress.current_location);
return timeline_parameters.timeline[loc].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;
this.setTimelineVariablesOrder();
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(Object.assign({}, 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') || (typeof jsPsych.plugins[trial_type] == 'function')) {
// 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 = Object.assign({}, 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++) {
// merge parameters
var merged_parameters = Object.assign({}, node_data, parameters.timeline[i]);
// merge any data from the parent node into child nodes
if(typeof node_data.data == 'object' && typeof parameters.timeline[i].data == 'object'){
var merged_data = Object.assign({}, node_data.data, parameters.timeline[i].data);
merged_parameters.data = merged_data;
}
timeline_parameters.timeline.push(new TimelineNode(merged_parameters, 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') && (trial_type.toString().replace(/\s/g,'') != "function(){returntimeline.timelineVariable(varname);}")) {
console.error('No plugin loaded for trials of type "' + trial_type + '"');
}
// create a deep copy of the parameters for the trial
trial_parameters = Object.assign({}, parameters);
}
}();
}
function startExperiment() {
loaded = true;
// show progress bar if requested
if (opts.show_progress_bar === true) {
drawProgressBar(opts.message_progress_bar);
}
// record the start time
exp_start_time = new Date();
// begin!
timeline.advance();
doTrial(timeline.trial());
}
function finishExperiment() {
if(typeof timeline.end_message !== 'undefined'){
DOM_target.innerHTML = timeline.end_message;
}
opts.on_finish(jsPsych.data.get());
}
function nextTrial() {
// if experiment is paused, don't do anything.
if(paused) {
waiting = true;
return;
}
global_trial_index++;
// advance timeline
timeline.markCurrentTrialComplete();
var complete = timeline.advance();
// update progress bar if shown
if (opts.show_progress_bar === true && opts.auto_update_progress_bar == true) {
updateProgressBar();
}
// check if experiment is over
if (complete) {
finishExperiment();
return;
}
doTrial(timeline.trial());
}
function doTrial(trial) {
current_trial = trial;
current_trial_finished = false;
// process all timeline variables for this trial
evaluateTimelineVariables(trial);
// evaluate variables that are functions
evaluateFunctionParameters(trial);
// get default values for parameters
setDefaultValues(trial);
// call experiment wide callback
opts.on_trial_start(trial);
// call trial specific callback if it exists
if(typeof trial.on_start == 'function'){
trial.on_start(trial);
}
// apply the focus to the element containing the experiment.
DOM_container.focus();
// reset the scroll on the DOM target
DOM_target.scrollTop = 0;
// execute trial method
jsPsych.plugins[trial.type].trial(DOM_target, trial);
// call trial specific loaded callback if it exists
if(typeof trial.on_load == 'function'){
trial.on_load();
}
}
function evaluateTimelineVariables(trial){
var keys = Object.keys(trial);
for (var i = 0; i < keys.length; i++) {
// timeline variables on the root level
if (typeof trial[keys[i]] == "function" && trial[keys[i]].toString().replace(/\s/g,'') == "function(){returntimeline.timelineVariable(varname);}") {
trial[keys[i]] = trial[keys[i]].call();
}
// timeline variables that are nested in objects
if (typeof trial[keys[i]] == "object" && trial[keys[i]] !== null){
evaluateTimelineVariables(trial[keys[i]]);
}
}
}
function evaluateFunctionParameters(trial){
// first, eval the trial type if it is a function
// this lets users set the plugin type with a function
if(typeof trial.type === 'function'){
trial.type = trial.type.call();
}
// now eval the whole trial
// start by getting a list of the parameters
var keys = Object.keys(trial);
// iterate over each parameter
for (var i = 0; i < keys.length; i++) {
// check to make sure parameter is not "type", since that was eval'd above.
if(keys[i] !== 'type'){
// this if statement is checking to see if the parameter type is expected to be a function, in which case we should NOT evaluate it.
// the first line checks if the parameter is defined in the universalPluginParameters set
// the second line checks the plugin-specific parameters
if(
(typeof jsPsych.plugins.universalPluginParameters[keys[i]] !== 'undefined' && jsPsych.plugins.universalPluginParameters[keys[i]].type !== jsPsych.plugins.parameterType.FUNCTION ) ||
(typeof jsPsych.plugins[trial.type].info.parameters[keys[i]] !== 'undefined' && jsPsych.plugins[trial.type].info.parameters[keys[i]].type !== jsPsych.plugins.parameterType.FUNCTION)
) {
if (typeof trial[keys[i]] == "function") {
trial[keys[i]] = trial[keys[i]].call();
}
}
}
// add a special exception for the data parameter so we can evaluate functions. eventually this could be generalized so that any COMPLEX object type could
// be evaluated at the individual parameter level.
if(keys[i] == 'data'){
var data_params = Object.keys(trial[keys[i]]);
for(var j=0; j<data_params.length; j++){
if(typeof trial[keys[i]][data_params[j]] == "function") {
trial[keys[i]][data_params[j]] = trial[keys[i]][data_params[j]].call();
}
}
}
}
}
function setDefaultValues(trial){
for(var param in jsPsych.plugins[trial.type].info.parameters){
// check if parameter is complex with nested defaults
if(jsPsych.plugins[trial.type].info.parameters[param].type == jsPsych.plugins.parameterType.COMPLEX){
if(jsPsych.plugins[trial.type].info.parameters[param].array == true){
// iterate over each entry in the array
for(var i in trial[param]){
// check each parameter in the plugin description
for(var p in jsPsych.plugins[trial.type].info.parameters[param].nested){
if(typeof trial[param][i][p] == 'undefined' || trial[param][i][p] === null){
if(typeof jsPsych.plugins[trial.type].info.parameters[param].nested[p].default == 'undefined'){
console.error('You must specify a value for the '+p+' parameter (nested in the '+param+' parameter) in the '+trial.type+' plugin.');
} else {
trial[param][i][p] = jsPsych.plugins[trial.type].info.parameters[param].nested[p].default;
}
}
}
}
}
}
// if it's not nested, checking is much easier and do that here:
else if(typeof trial[param] == 'undefined' || trial[param] === null){
if(typeof jsPsych.plugins[trial.type].info.parameters[param].default == 'undefined'){
console.error('You must specify a value for the '+param+' parameter in the '+trial.type+' plugin.');
} else {
trial[param] = jsPsych.plugins[trial.type].info.parameters[param].default;
}
}
}
}
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().innerHTML = msg;
} else {
clearInterval(interval);
core.getDisplayElement().innerHTML = '';
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().innerHTML = msg;
fail();
return;
}
}
// GO?
if(clear){ success(); }
}
function drawProgressBar(msg) {