utils.js

var show_data = {
    type: jsPsychHtmlButtonResponse,
    stimulus: function() {
        // var trial_data = jsPsych.data.getLastTrialData().values();
        var data_json = JSON.stringify(jsPsych.data.allData, null, 2);
        return `<p style="margin-bottom:0px;"><strong>All Data:</strong></p>
        <pre style="margin-top:0px;text-align:left;">${data_json}</pre>`;
    },
    choices: ['Repeat demo']
};

function saveData(name, data) {
    var xhr = new XMLHttpRequest();
    xhr.open('POST', 'record_data.php');
    xhr.setRequestHeader('Content-Type', 'application/json');
    xhr.send(JSON.stringify({
        filename: name,
        data: data
    }));
}

function createUID() {
    UID = "T" + Date.now() + "_K" + Math.floor((Math.random() * 100000000) + 1);
    return UID
}

function getRandomInt(max) {
    return Math.floor(Math.random() * max);
}

function flip() {
    return getRandomInt(2)
}

function randperm(maxValue) {
    // first generate number sequence
    var permArray = new Array(maxValue);
    for (var i = 0; i < maxValue; i++) {
        permArray[i] = i;
    }
    // draw out of the number sequence
    for (var i = (maxValue - 1); i >= 0; --i) {
        var randPos = Math.floor(i * Math.random());
        var tmpStore = permArray[i];
        permArray[i] = permArray[randPos];
        permArray[randPos] = tmpStore;
    }
    return permArray;
}