Manage Participants - Javascript

1. Local Participant (self)

Local participant is used to consume your video & audio streams. it contains information about local participant such as displayName, id, quality and streams Map.

You can acces localParticipant from the meeting object.

Participant object properties

Property Name	Type	Description
id	string	Unique id of the participant.
displayName	string	The name you define during the meeting initialization.
local	boolean	Indicates the participant is local or not.
quality	string	Indicates the participant streams quality.
Streams	Map of Stream	Returns Video & Audio Streams.

Stream Object properties

Property Name	Type	Description
id	string	Unique id
codec	string	Video/Audio codec.
kind	string	Stream Kind.
track	string	MediaStreamTrack

2. Other Participants (Except You)

Other participants Map is used to get all the participants (except you) in the meeting at any given time.

Other participants Map contains same properties as LocalParticipant.

Local And Other Participants

/** localParticipant contains Participant object
  as displayed above local participant section */
const localParticipant = meeting.localParticipant;

localParticipant.streams.forEach((stream) => {
  setTrack(stream, videoElement, audioElement, participant.id);
});

const participants = meeting.participants;

/** to play other participants video & audio */
function loadOtherParticipants() {
  meeting.participants.forEach((participant) => {
    let videoElement = createVideoElement(participant.id);
    let audioElement = createAudioElement(participant.id);

    participant.streams.forEach((stream) => {
      setTrack(stream, videoElement, audioElement, participant.id);
    });

    videoContainer.appendChild(videoElement);
    videoContainer.appendChild(audioElement);
  });
}

// creating video element
function createVideoElement(pId) {
  let videoElement = document.createElement("video");
  videoElement.setAttribute("id", `v-${pId}`);
  return videoElement;
}

// creating audio element
function createAudioElement(pId) {
  let audioElement = document.createElement("audio");
  audioElement.setAttribute("autoPlay", "false");
  audioElement.setAttribute("playsInline", "true");
  audioElement.setAttribute("controls", "false");
  audioElement.setAttribute("id", `a-${pId}`);
  return audioElement;
}

//setting up tracks
function setTrack(stream, videoElem, audioElement, id) {
  if (stream.kind == "video") {
    const mediaStream = new MediaStream();
    mediaStream.addTrack(stream.track);
    videoElem.srcObject = mediaStream;
    videoElem
      .play()
      .catch((error) =>
        console.error("videoElem.current.play() failed", error)
      );
  }
  if (stream.kind == "audio") {
    if (id == meeting.localParticipant.id) return;
    const mediaStream = new MediaStream();
    mediaStream.addTrack(stream.track);
    audioElement.srcObject = mediaStream;
    audioElement
      .play()
      .catch((error) => console.error("audioElem.play() failed", error));
  }
}

3. Participant Related Events

1. participant-joined - Whenever any new participant join the meeting, participant-joined event will trigger. For example, the meeting is running with Alice and Bob, then Eve join that meeting, after that participant-joined event trigger and return the participant object.

2. participant-left - Whenever any participant leave/exit the meeting, participant-left event will trigger.For example, the meeting is running with Alice and Bob, then Bob leave that meeting, after that participant-left event trigger and return the participant object

3. presenter-changed - Whenever any participant present/screenshare their screen/window in meeting, presenter-changed event will trigger and return the presenter participantId.

4. stream-enabled - Whenever any participant enabled mic/webcam in meeting, stream-enabled event will trigger and return Stream.

5. stream-disabled - Whenever any participant disabled mic/webcam in meeting, stream-disabled event will trigger and return Stream.

meeting.on("participant-joined", (participant) => {
  participant.on("stream-enabled", (stream) => {
    // You can find this setTrack() helper function on previous code snippet
    setTrack(stream, videoElement, audioElement, participant.id);
  });
});
meeting.on("participant-left", (participant) => {
  participant.on("stream-disabled", (stream) => {
    // You can find this setTrack() helper function on previous code snippet
    setTrack(stream, videoElement, audioElement, participant.id);
  });
});
meeting.on("presenter-changed", (participantId) => {});