JavaScript-AirPlay-Medium-Liberty.js

// Detect if AirPlay is available
// Mac OS Safari 9+ only
if (window.WebKitPlaybackTargetAvailabilityEvent) {
  video.addEventListener('webkitplaybacktargetavailabilitychanged', function(event) {
    switch (event.availability) {
      case "available":
        airPlay.style.display = 'block';
        break;

      default:
        airPlay.style.display = 'none';
    }

    airPlay.addEventListener('click', function() {
      video.webkitShowPlaybackTargetPicker();
    });
  });
} else {
  airPlay.style.display = 'none';
}