webrtchacks-example-beforeunload-pagehide.js

/**
 * iOS doesn't support beforeunload, use pagehide instead.
 * NOTE: I tried doing this detection via examining the window object
 *       for onbeforeunload/onpagehide, but they both exist in iOS, even
 *       though beforeunload is never fired.
 */

var iOS = ['iPad', 'iPhone', 'iPod'].indexOf(navigator.platform) >= 0;
var eventName = iOS ? 'pagehide' : 'beforeunload';
window.addEventListener(eventName, function (event) {
  // Do the work...
});