pi-rfid-jukebox/static/jukebox.js

window.onload = function() {
    console.log('window.onload');

    var play_log = document.getElementById('play-log');
    var last_tag = document.getElementById('last-tag');

    function updateLog(data) {
        last_tag.innerHTML = data.tag;
        play_log.innerHTML = data.html;
    }

    var host = window.document.location.host.replace(/:.*/, '');
    var ws = new WebSocket('ws://' + host + ':' + jukebox.port);
    ws.onmessage = function (event) {
        updateLog(JSON.parse(event.data));
    };

};