Facebook like video autoplay and pause

Question

In my website there is page with many videos. The videos should autoplay when the iframe video is completely visible in the viewport. When the videos move above the viewport means, the video should pause as we are seeing in facebook.

Note: I'm using iframe, but not html5 video element.

Answer 1

Although SO is not the place to request code, I will answer that because of the challenge and for other people who need the idea.

So, I'm using jquery.inview plugin to detect when the iframe are in the viewport.

Also, I'm using youtube api to control the video's iframe.

It's not easy to explain how each line works so read the code and if you will have a question, please comment.

Here is the full code (It's not working on this site because of security reason so you can see the live in http://output.jsbin.com/soqezo)

// Inject YouTube API script
var tag = document.createElement('script');
tag.src = "//www.youtube.com/player_api";
var firstScriptTag = document.getElementsByTagName('script')[0];
firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);


var players = [];
function onYouTubePlayerAPIReady() {
  $('iframe').each(function() {
    var ifr = $(this),
        player = new YT.Player(ifr[0].id);

    ifr.data('player', player);
    players.push(player);
  });

  initInView();
}

function pausePlayers() {
  for (var i in players) {
    players[i] && players[i].pauseVideo && players[i].pauseVideo();
  }
}

function initInView() {
  $('div').each(function() {
    $(this).on('inview', function(event, isInView) {
      if (isInView) {
        // element is now visible in the viewport
        pausePlayers();
        var player = $(this).find('iframe').data('player');
        if (player) {
          player.playVideo && player.playVideo();
        }
      } else {
        // element has gone out of viewport
        //$(this).find('iframe').data('player').pauseVideo();
      }
    });
  });
}

html, body, div {
  height:100%;
}

div {
  width:100%;
  height:100%;
  background:red;
  margin-bottom:100px;
}

iframe {
  width:100%;
  height:100%;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdn.jsdelivr.net/jquery.inview/0.2/jquery.inview.min.js"></script>

<div>
    <iframe src="//www.youtube.com/embed/FKWwdQu6_ok?enablejsapi=1" frameborder="0" allowfullscreen id="video1"></iframe>
</div>
<div>
    <iframe src="//www.youtube.com/embed/FKWwdQu6_ok?enablejsapi=1" frameborder="0" allowfullscreen id="video2"></iframe>
</div>
<div>
    <iframe src="//www.youtube.com/embed/FKWwdQu6_ok?enablejsapi=1" frameborder="0" allowfullscreen id="video3"></iframe>
</div>
<div>
    <iframe src="//www.youtube.com/embed/FKWwdQu6_ok?enablejsapi=1" frameborder="0" allowfullscreen id="video4"></iframe>
</div>
<div>
    <iframe src="//www.youtube.com/embed/FKWwdQu6_ok?enablejsapi=1" frameborder="0" allowfullscreen id="video5"></iframe>
</div>

Answer 2

You can achieve the same effect using

iframe.contentWindow.postMessage(message, origin);

without using YouTube's Player API. Check out the link below for the live demo:

https://codepen.io/mcakir/pen/JpQpwm

NOTE: The live demo supports play/pause iframe videos from Youtube, vimeo and dailymotion (more will be added soon) without using any player's libraries or SDK's