function to remove the remote containers

.js

// remove the remote-container when a user leaves the channel
client.on("peer-leave", function(evt) {
  var streamId = evt.stream.getId(); // the the stream id
  if(remoteStreams[streamId] != undefined) {
    remoteStreams[streamId].stop(); // stop playing the feed
    delete remoteStreams[streamId]; // remove stream from list
    if (streamId == mainStreamId) {
      var streamIds = Object.keys(remoteStreams);
      var randomId = streamIds[Math.floor(Math.random()*streamIds.length)]; // select from the remaining streams
      remoteStreams[randomId].stop(); // stop the stream's existing playback
      var remoteContainerID = '#' + randomId + '_container';
      $(remoteContainerID).empty().remove(); // remove the stream's miniView container
      remoteStreams[randomId].play('full-screen-video'); // play the random stream as the main stream
      mainStreamId = randomId; // set the new main remote stream
    } else {
      var remoteContainerID = '#' + streamId + '_container';
      $(remoteContainerID).empty().remove(); // 
    }
  }
});