Lazy load Youtube videos

// enforced callback from Youtube = must be top-level
function onYouTubeIframeAPIReady() {
  app.video.loadVideo("#myVideo");
}

app.video = (function () {
  function init() {
    // from https://developers.google.com/youtube/iframe_api_reference
    // not: will not work in IE7 (postmessage)

    // load API code
    var tag = document.createElement("script");
    tag.src = "https://www.youtube.com/iframe_api";
    document.body.appendChild(tag);
  }

  function loadVideo(container) {
    var video = $(container);
    var myVideo = new YT.Player(video.attr("id"), {
      // id of container
      height: video.data("height"),
      width: video.data("width"),
      videoId: video.data("src"),
      events: {
        onReady: onPlayerReady,
        onStateChange: onPlayerStateChange,
      },
    });
  }

  function onPlayerReady(event) {
    // pass
  }

  function onPlayerStateChange(event) {
    switch (event.data) {
      case 1:
        _gaq.push([
          "_trackEvent",
          "My Video",
          "Internal Link",
          "Click to play " + event.target.l.id,
        ]);
        break;
      case 2:
        _gaq.push([
          "_trackEvent",
          "My Video",
          "Internal Link",
          "Click to pause " + event.target.l.id,
        ]);
        break;
      case 0:
        _gaq.push([
          "_trackEvent",
          "My Video",
          "Internal Link",
          event.target.l.id + " finished",
        ]);
        break;

      default:
        break;
    }
  }

  return {
    init: init,
    loadVideo: loadVideo,
  };
})();

https://developers.google.com/youtube/iframe_api_reference