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                <div class="page-wrapper">
<h1 style="margin-bottom: -20px; font-weight: 300;">Vue.js & Wavesurfer.js Audio Player Component</h1>
<div id="wavesurfer-components">
track-name="Leotrix - Radar" />

<div class="pen-notes">
  <p><em>Click on the waveform to move forwards of backwards.</em></p>
  <p>This is an audio player component made using Vue.js and Wavesurfer.js. It is suitable for short audio files such as songs or short audio clips. The primary puropse of this pen was to experiment with a "<em>checkbox input</em> play button" styling and
    gradient styling (fading out waveform). I don't reccommend using this component for long audio files due to performance reasons. Audio controls can be extended using the various <a href="">methods provided by wavesurfer.js</a>.</p>
  <ul style="list-style: none; padding: 0; margin: 0;">
    <li><strong>track-url</strong> : link to the audio file</li>
    <li><strong>track-name</strong> : name of the track</li>
  <br />
  <p>Song: <a href="">Radar by Leotrix</a></p>
    <a href="">Contact Parker</a>


*:after {
  box-sizing: border-box;

$color-one: #ccc;
$color-two: #333;
$size: 50px;

body {
  text-align: center;
  color: #7f8c8d;
  box-sizing: border-box;
  font-family: Roboto;

.page-wrapper {
  background-color: #eee;
  padding: 10px;
  min-height: 100vh;

.mpakt-player-container {
  background: linear-gradient(0.25turn, $color-two 10%, $color-one);
  height: 80px;
  display: flex;
  // border: 1px solid rgba( 130, 100, 255, 1);
  border-radius: 6px;
  padding: 10px 10px 10px 16px;
  margin-top: 60px;
  box-shadow: 0px 0px 30px $color-two inset, 0px 0px 1px 1px rgba(1, 1, 1, 0.1);
  transition: all 1s ease;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;

.mpakt-player-waveform {
  flex: auto;
  transition: all 1s ease-in;
  z-index: 3;
  margin-right: -10px;

.gradient-overlay {
  position: relative;
  height: 76px;
  margin-bottom: -65px;
  margin-top: -10px;
  margin-right: -20px;
  width: 80%;
  background: linear-gradient(90deg, $color-two, rgba(0, 0, 0, 0));
  z-index: 3;
  pointer-events: none;

.play-button {
  display: block;
  position: relative;
  width: 25px;
  height: 1fr;
  margin-top: -10px;
  margin-bottom: -10px;
  margin-right: -40px;
  margin-left: 5px;
  cursor: pointer;
  z-index: 4;
  opacity: 0.3;
  transition: opacity 0.2s ease-in;
  &:hover {
    opacity: 1;
  input[type="checkbox"] {
    display: none;
    &:checked {
      ~ span {
        &::after {
          border: ($size / 4) solid transparent;
          border-left: ($size / 2) solid white;
          border-right: 0;
        &::after {
          transform: translateY(-50%) scaleY(0.5);
  span {
    display: block;
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    margin: auto;
    width: ($size / 2);
    height: ($size / 2);
    &::after {
      content: "";
      display: block;
      position: absolute;
      top: 50%;
      transform: translateY(-50%);
      height: 100%;
      border: 0 solid transparent;
      border-left: ($size / 5) solid white;
      transition: all 0.4s ease;
      right: 0;
    &::before {
      left: 0;
.track-title {
  position: absolute;
  font-size: 1em;
  color: white;
  border: 2px solid white;
  margin-top: 16px;
  margin-left: 50px;
  z-index: 6;
  padding: 3px 10px 4px 10px;
  background: rgba(1, 1, 1, 0.2);
  box-shadow: 0px 0px 5px rgba(1, 1, 1, 0.4);
  max-width: 70%;
  opacity: 0.3;
  transition: all 1s ease;
.track-title:hover {
  opacity: 1;
  transform: scale(1.03);
audio {
  display: none;

.pen-notes {
  width: 90%;
  margin: 40px auto 0px auto;
  max-width: 500px;



                var mpaktPlayerCounter = 0;
// to-do: check for this variable and set it from within the component itself.

// Player Component
Vue.component("mpakt-player", {
    <div class="mpakt-player-container">
      <label class="play-button"><input type="checkbox" @click="playPause" checked><span></span></label>
      <div :id="waveformElementId" class="mpakt-player-waveform">
          <div class="gradient-overlay"></div>
      <p  v-if="trackName" class="track-title">{{trackName}}</p>
  props: ["trackUrl", "trackName"],
  computed: {
    waveformElementId: () => {
      return "mpakt-player-" + mpaktPlayerCounter;
  methods: {
    playPause() {
  created(){ // Increment to produce waveFormElementId
    mpaktPlayerCounter += 1;
  mounted() {
      this.surfer = WaveSurfer.create({
          container: "#" + this.waveformElementId, //Render waveform within this component 
          height: 57,
          fillParent: false,
          scrollParent: true,
          minPxPerSec: 60,
          mediaControls: true,
          cursorColor: "#fff",
          cursorWidth: 0,
          backend: "MediaElement",
          barWidth: 1,
          barGap: 0,
          hideScrollbar: true,
          pixelRatio: 1,
          partialRenter: true,
          progressColor: "#fff",
          waveColor: "#333",
          autoCenter: true

// Vue Instance
new Vue({
  el: "#wavesurfer-components"