What could be causing the failure of the update for this computed property in my Vue 3 application?

Currently, I am in the process of creating an audio player using Vue 3 and the Napster API.

About the Project

I have managed to make the vinyl rotate by utilizing a CSS keyframes-based animation paired with the computed property isSpinning.

I intend for the vinyl to stop spinning once it reaches the end of the current track. This is achieved through the following "formula" within the isSpinning function:

isSpinning() {
  return this.isPlaying && !this.player.ended;
}
...

Encountered Issue

However, I found that the application does not recognize when the value of this.player.ended changes as expected.

What Could be the Error in my Approach?

javascriptcssvue.jsvuejs3

Answer №2

When using an Audio object in Vue, it will not function like typical JavaScript objects due to how Vue abstracts state change observation. The internal mechanisms used by Vue to detect changes in the Audio object's state may not be maintained, making it difficult for Vue to recognize when the object transitions from ended === false to ended === true.

To monitor changes in the ended state effectively, consider adding a custom event listener within the created hook to toggle the spinning state without relying on the ended check:

const musicApp = {
  data() {
    return {
      player: new Audio(),
      trackCount: 0,
      tracks: [],
      muted: false,
      isPlaying: false
    };
  },
  methods: {
    async getTracks() {
      try {
        const response = await axios
          .get(
            "https://api.napster.com/v2.1/tracks/top?apikey=ZTk2YjY4MjMtMDAzY00MTg4LWE2MjYtZDIzNjJmMmM0YTdm"
          )
          .catch((error) => {
            console.log(error);
          });
        this.tracks = response;
        this.tracks = response.data.tracks;
      } catch (error) {
        console.log(error);
      }
    },
    nextTrack() {
      if (this.trackCount < this.tracks.length - 1) {
        this.trackCount++;
        this.setPlayerSource();
        this.playPause();
      }
    },
    prevTrack() {
      if (this.trackCount >= 1) {
        this.trackCount--;
        this.setPlayerSource();
        this.playPause();
      }
    },
    setPlayerSource() {
      this.player.src = this.tracks[this.trackCount].previewURL;
    },
    playPause() {
      if (this.player.paused) {
        this.isPlaying = true;
        this.player.play();
      } else {
        this.isPlaying = false;
        this.player.pause();
      }
    },
    toggleMute() {
      this.player.muted = !this.player.muted;
      this.muted = this.player.muted;
    }
  },
  async created() {
    await this.getTracks();
    this.setPlayerSource();
    this.player.addEventListener('ended', () => {
      this.isPlaying = false;
    });
  },
  computed: {
    isSpinning() {
      return this.isPlaying;
    }
  }
};

Vue.createApp(musicApp).mount("#audioPlayer");
html,
body {
  margin: 0;
  padding: 0;
  font-size: 16px;
}

body * {
  box-sizing: border-box;
  font-family: "Montserrat", sans-serif;
}

@-webkit-keyframes spin {
  0% {
    -webkit-transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(360deg);
  }
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

.player-container {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background-color: #2998ff;
  background-image: linear-gradient(62deg, #2998ff 0%, #5966eb 100%);
}

#audioPlayer {
  width: 300px;
  height: 300px;
  border-radius: 8px;
  position: relative;
  overflow: hidden;
  background-color: #00ca81;
  background-image: linear-gradient(160deg, #00ca81 0%, #ffffff 100%);
  box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.volume {
  color: #ff0057;
  opacity: 0.9;
  display: inline-block;
  width: 20px;
  font-size: 20px;
  position: absolute;
  top: 5px;
  right: 6px;
  cursor: pointer;
}

.album {
  width: 100%;
  flex: 1;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
}

.album-items {
  padding: 0 10px;
  text-align: center;
}

.cover {
  width: 150px;
  height: 150px;
  margin: auto;
  box-shadow: 0px 5px 12px 0px rgba(0, 0, 0, 0.17);
  border-radius: 50%;
  background: url("https://w7.pngwing.com/pngs/710/955/png-transparent-vinyl-record-artwork-phonograph-record-compact-disc-lp-record-disc-jockey-symbol-miscellaneous-classical-music-sound.png") center top transparent;
  background-size: cover;
}

.cover.spinning {
  webkit-animation: spin 6s linear infinite;
  /* Safari */
  animation: spin 6s linear infinite;
}

.info {
  width: 100%;
  padding-top: 5px;
  color: #000;
  opacity: 0.85;
}

.info h1 {
  font-size: 11px;
  margin: 5px 0 0 0;
}

.info h2 {
  font-size: 10px;
  margin: 3px 0 0 0;
}

.to-bottom {
  width: 100%;
  margin-top: auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}

.track {
  background-color: #ff0057;
  opacity: 0.9;
  height: 3px;
  width: 100%;
}

.controls {
  width: 150px;
  display: flex;
  height: 60px;
  justify-content: space-between;
  align-items: center;
}

.controls .navigate {
  display: flex;
  box-shadow: 1px 2px 7px 2px rgba(0, 0, 0, 0.09);
  width: 33px;
  height: 33px;
  line-height: 1;
  color: #ff0057;
  cursor: pointer;
  background: #fff;
  opacity: 0.9;
  border-radius: 50%;
  text-align: center;
  justify-content: center;
  align-items: center;
}

.controls .navigate.disabled {
  pointer-events: none;
  color: #606060;
  background-color: #f7f7f7;
}

.controls .navigate.navigate-play {
  width: 38px;
  height: 38px;
}

.navigate-play .fa-play {
  margin-left: 3px;
}
<link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet" />
<script src="https://unpkg.com/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="b5d4cddcdac6f5859b87879b85">[email protected]</a>/dist/axios.min.js"></script>
<script src="https://unpkg.com/vue@next"></script>
<link href="https://fonts.googleapis.com/css2?family=Montserrat:wght@300;500&display=swap" rel="stylesheet">

<div class="player-container">
  <div id="audioPlayer">
    <span class="volume" @click="toggleMute">
      <i v-show="!muted" class="fa fa-volume-up"></i>
      <i v-show="muted" class="fa fa-volume-off"></i>
    </span>
    <div class="album">
      <div class="album-items">
        <div class="cover" :class="{'spinning' : isSpinning}"></div>
        <div class="info">
          <h1>{{tracks[trackCount].name}}</h1>
          <h2>{{tracks[trackCount].artistName}}</h2>
        </div>
      </div>
    </div>

    <div class="to-bottom">
      <div class="track"></div>
      <div class="controls">
        <div class="navigate navigate-prev" :class="{'disabled' : trackCount == 0}" @click="prevTrack">
          <i class="fa fa-step-backward"></i>
        </div>
        <div class="navigate navigate-play" @click="playPause">
          <i v-show="!isPlaying" class="fa fa-play"></i>
          <i v-show="isPlaying" class="fa fa-pause"></i>
        </div>
        <div class="navigate navigate-next" :class="{'disabled' : trackCount == tracks.length - 1}" @click="nextTrack">
          <i class="fa fa-step-forward"></i>
        </div>
      </div>
    </div>
  </div>
</div>

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