// jspsych.js // // Josh de Leeuw // Percepts and Concepts Lab, Indiana University // // (function($) { jsPsych = (function() { // // public object // var core = {}; // // private class variables // // options var opts = {}; // exp structure var exp_blocks = []; // flow control var curr_block = 0; // everything loaded? var initialized = false; // target DOM element var DOM_target; // time that the experiment began var exp_start_time; // // public methods // // core.init creates the experiment and starts running it // display_element is an HTML element (usually a

) that will display jsPsych content // options is an object: { // "experiment_structure": an array of blocks specifying the experiment // "finish": function to execute when the experiment ends // } // core.init = function(options) { // reset the key variables exp_blocks = []; opts = {}; initialized = false; curr_block = 0; // check if there is a body element on the page var default_display_element = $('body'); if (default_display_element.length === 0) { $(document.documentElement).append($('')); 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; } }; // import options opts = $.extend({}, defaults, options); // set target DOM_target = opts.display_element; run(); }; // core.data returns all of the data objects for each block as an array // where core.data[0] = data object from block 0, etc... core.data = function() { var all_data = []; for (var i = 0; i < exp_blocks.length; i++) { all_data[i] = exp_blocks[i].data; } return all_data; }; // core.dataAsCSV returns a CSV string that contains all of the data // append_data is an option map object that will append values // to every row. for example, if append_data = {"subject": 4}, // then a column called subject will be added to the data and // it will always have the value 4. core.dataAsCSV = function(append_data) { var dataObj = core.data(); return JSON2CSV(flattenData(dataObj, append_data)); }; // core.progress returns an object with the following properties // total_blocks: the number of total blocks in the experiment // total_trials: the number of total trials in the experiment // current_trial_global: the current trial number in global terms // i.e. if each block has 20 trials and the experiment is // currently in block 2 trial 10, this has a value of 30. // current_trial_local: the current trial number within the block. // current_block: the current block number. core.progress = function() { var total_trials = 0; for (var i = 0; i < exp_blocks.length; i++) { total_trials += exp_blocks[i].num_trials; } var current_trial_global = 0; for (var i = 0; i < curr_block; i++) { current_trial_global += exp_blocks[i].num_trials; } current_trial_global += exp_blocks[curr_block].trial_idx; var obj = { "total_blocks": exp_blocks.length, "total_trials": total_trials, "current_trial_global": current_trial_global, "current_trial_local": exp_blocks[curr_block].trial_idx, "current_block": curr_block }; return obj; }; // core.startTime() returns the Date object which represents the time that the experiment started. core.startTime = function() { return exp_start_time; }; // // private functions // // function run() { // take the experiment structure and dynamically create a set of blocks exp_blocks = new Array(opts.experiment_structure.length); // iterate through block list to create trials for (var i = 0; i < exp_blocks.length; i++) { var trials = jsPsych[opts["experiment_structure"][i]["type"]]["create"].call(null, opts["experiment_structure"][i]); exp_blocks[i] = createBlock(trials); } // record the start time exp_start_time = new Date(); // begin! - run the first block exp_blocks[0].next(); } function nextBlock() { curr_block += 1; if (curr_block == exp_blocks.length) { finishExperiment(); } else { exp_blocks[curr_block].next(); } } function createBlock(trial_list) { var block = { trial_idx: -1, trials: trial_list, data: [], next: function() { // call on_trial_finish() // if not very first trial // and not the last call in this block (no trial due to advance in block) if (typeof this.trials[this.trial_idx + 1] != "undefined" && (curr_block != 0 || this.trial_idx > -1)) { opts.on_trial_finish(); }; this.trial_idx = this.trial_idx + 1; var curr_trial = this.trials[this.trial_idx]; if (typeof curr_trial == "undefined") { return this.done(); } // call on_trial_start() opts.on_trial_start(); do_trial(this, curr_trial); }, writeData: function(data_object) { this.data[this.trial_idx] = data_object; opts.on_data_update(data_object); }, done: nextBlock, num_trials: trial_list.length }; return block; } function finishExperiment() { opts["on_finish"].apply((new Object()), [core.data()]); } function do_trial(block, trial) { // execute trial method jsPsych[trial.type]["trial"].call(this, DOM_target, block, trial, 1); } // // 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 (columns.indexOf(key) == -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 core; })(); })(jQuery);