The Vue.js reactivity system does not detect changes when a property is updated within a WebRTC callback

Is Vue.js component creation becoming a challenge for you? Imagine creating a small component that requires permissions for the camera and microphone from the user, displaying that stream on a canvas. Sounds simple, right?

However, let's face reality - I faced an issue where Vue.js wasn't updating the src property of my video tag as expected. To troubleshoot, I added a status message to see if any changes are being detected by Vue. Spoiler alert: they weren't. How do we ensure that Vue picks up property changes within the getUserMedia callback?

If you're interested, check out this fiddle: https://jsfiddle.net/49r0c4cf/

Furthermore, here's the code snippet:

<template>
  <div>
    <button @click="getPermissions()" >Get permissions</button>
    <video v-bind:src="videoStreamSrc" autoplay></video>
    <h1>{{status}}</h1>
  </div>
</template>

<script>
export default {
  data() {
    return {
      videoStreamSrc: null,
      status: 'default',
    };
  },
  methods: {
    getPermissions() {
      this.status = 'FETCHING';
      const vm = this;
      navigator.mediaDevices.getUserMedia({
        video: true,
        audio: true,
      }, () => {
        // vm.videoStreamSrc = window.URL.createObjectURL(localMediaStream);
        vm.$set('status', 'DONE');
      }, (err) => {
        // eslint-disable-next-line
        console.error(err);
      });
    },
  },
};
</script>

Answer №1

Based on information from this source, when using getUserMedia, it is recommended to utilize a Promise in the following manner:

navigator.mediaDevices.getUserMedia({
  video: true,
  audio: true
}).then(stream => {
  this.status = 'COMPLETE'
}, err => {
  console.error(err)
})

https://jsfiddle.net/49r0c4cf/1/

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