SimpleBrowserMusic/music.html at master · Xernisfy/SimpleBrowserMusic · GitHub

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<!doctype html>
<html>

<head>
  <title>Music player</title>
  <meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
  <script type="text/javascript">(function () {
      'use strict';
      document.addEventListener('DOMContentLoaded', function () {
        // helper function to assign multiple properties to an object recursively
        function set(e, as) {
          for (let a in as) {
            if (as[a].constructor.name === 'Object') {
              set(e[a], as[a]);
            } else {
              e[a] = as[a];
            }
          }
        }
        // helper function to create elements
        function create(t, p, a) {
          const e = document.createElement(t);
          if (p) {
            p.appendChild(e);
          }
          if (a) {
            set(e, a);
          }
          return e;
        }
        // helper function to send an XMLHttpRequest
        function xhr(file) {
          const xhr = new XMLHttpRequest();
          xhr.open('GET', file);
          xhr.overrideMimeType('text/plain');
          xhr.addEventListener('loadend', () => {
            if (xhr.status === 200) {
              listFiles(xhr.response);
            }
          });
          xhr.send();
        }
        // helper function to track slider position
        let originalTarget;
        function dragSlider(mouseEvent, track, callback) {
          // activate on left mouse button press
          if (mouseEvent.buttons === 1) {
            // save current event target
            if (!originalTarget) {
              originalTarget = mouseEvent.target;
            }
            // pass on slider percentage
            if (originalTarget === track) {
              callback(Math.min(Math.max((mouseEvent.clientX - track.getBoundingClientRect().left) / track.clientWidth * 100, 0), 100));
            }
          // deactivate on left mouse button release
          } else {
            originalTarget = undefined;
          }
        }
        // helper function to create a slider specifically
        function createSlider(p, w, h, init, color, callback) {
          const track = create('div', p, {
            style: {
              display: 'inline-block',
              width: w + 'px',
              height: h + 'px',
              backgroundImage: 'linear-gradient(to right, #000000, #7f7f7f)',
              backgroundRepeat: 'no-repeat',
              borderRadius: '200px'
            }
          });
          const slider = create('div', track, {
            style: {
              width: init + '%',
              height: '100%',
              pointerEvents: 'none',
              backgroundColor: color,
              borderRadius: '200px'
            }
          });
          // track slider position while dragging
          window.addEventListener('mousemove', (e) => {
            dragSlider(e, track, callback);
          });
          // track slider position on first click
          track.addEventListener('mousedown', (e) => {
            dragSlider(e, track, callback);
          })
          return slider;
        }
        // create a 'select' element, include all given elements as 'option's and save the according audios
        function listFiles(list) {
          let options, option;
          select = create('select', document.body);
          options = list.split('\n');
          for (let o = 0; o < options.length; o++) {
            if (options[o] !== '') {
              option = create('option', select, {
                value: o,
                innerText: options[o]
              });
              audios.push(audio(options[o]));
            }
          }
        }
        // turn a relative path to an mp3 file into an audio element
        function audio(file) {
          const audio = create('audio', false, {
            // loading of the actual sound file apparently starts asynchronous once this element is created which should be prevented
            preload: 'none'
          });
          create('source', audio, {
            src: file,
            type: 'audio/mpeg'
          });
          return audio;
        }
        // update the timeline with the current time
        function update() {
          timelineSlider.style.width = (currentAudio.currentTime / currentAudio.duration * 100) + '%';
        }
        // TODO
        function changeTrack(idx) {

        }
        let select, audios = [], currentAudio, currentAudioIdx, interval, volume = 0.1, timeline = 0;
        // play button
        const play = create('button', document.body, {
          innerText: String.fromCharCode(0x23F5) // 'right arrow'
        });
        play.addEventListener('click', () => {
          if (currentAudioIdx != select.value) {
            if (currentAudio) {
              currentAudio.pause();
            }
            currentAudio = undefined;
          }
          if (!currentAudio) {
            currentAudio = audios[parseInt(select.value)].cloneNode(true);
            currentAudio.volume = volume;
            currentAudio.loop = Boolean(parseInt(loop.dataset.active));
            currentAudioIdx = select.value;
            currentAudio.addEventListener('durationchange', update);
            currentAudio.addEventListener('timeupdate', update);
          }
          currentAudio.play();

        });
        // pause button
        const pause = create('button', document.body, {
          innerText: String.fromCharCode(0x23F8) // 'two blocks'
        });
        pause.addEventListener('click', () => {
          if (currentAudio) {
            currentAudio.pause();
          }
          if (interval) {
            clearInterval(interval);
          }
        });
        // previous button
        const previous = create('button', document.body, {
          innerText: String.fromCharCode(0x23EE) // 'double left arrow with block'
        });
        previous.addEventListener('click', () => {
          if (currentAudio) {
            currentAudio.pause();
          }
        });
        // TODO: next button
        // TODO: shuffle button
        // loop button
        const loop = create('button', document.body, {
          innerText: String.fromCharCode(0x2B6E), // 'self-chasing arrow'
          dataset: {
            active: '1'
          }
        });
        loop.addEventListener('click', () => {
          set(loop, {
            dataset: {
              active: 1 - parseInt(loop.dataset.active)
            },
            style: {
              color: Boolean(parseInt(loop.dataset.active)) ? 'grey' : 'black'
            }
          });
          if (currentAudio) {
            currentAudio.loop = Boolean(parseInt(loop.dataset.active));
          }
        });
        // TODO: cross-fade button
        /*
        const cross = create('button', document.body, {
          innerText: String.fromCharCode(0x292E) // 'intertwined arrows'
        });
        */
        // volume slider
        const volumeSlider = createSlider(document.body, 100, 8, volume * 100, '#3f7fff', (percent) => {
          volume = percent / 100;
          if (currentAudio) {
            currentAudio.volume = volume;
          }
          volumeSlider.style.width = percent + '%';
          volumeDisplay.innerText = Math.floor(percent) + '%';
        });
        // volume display
        const volumeDisplay = create('span', document.body, {
          innerText: (volume * 100) + '%',
          style: {
            display: 'inline-block',
            width: '40px',
            textAlign: 'right',
            padding: '0px 8px'
          }
        });
        // timeline
        const timelineSlider = createSlider(document.body, 400, 8, 0, '#7fff3f', (percent)=>{
          if (currentAudio) {
            currentAudio.currentTime = percent / 100 * currentAudio.duration;
            update();
          }
        });
        // request the file containing the relative paths to all the audio files
        xhr('music.txt');
      });
    })();</script>
  <style type="text/css">
    * {
      font-family: 'Segoe UI', sans-serif;
    }
  </style>
</head>

<body></body>

</html>