Triggers onorientationchange events.

jQuery.onOrientationChange.js

(function() {
  if (window.orientation) {
    window.onorientationchange = function() {
      var orientation = 'portrait';
      if (window.orientation == 90 || window.orientation == -90) {
        orientation = 'landscape';
      }
      $('html').addClass(orientation);
      $('body').trigger(
        'orientationchange',  // the trigger
        orientation,          // orientation of the document
        window.orientation    // angle in degrees
      );
    }
  }
})();

I have not used the snippit for many years now, so I actually don't know if it still works.