Detect orientation change on iOS and Android + 180 degrees rotation fix for Android.

orientation-180-degrees-fix.js

var orientation = (window.innerHeight > window.innerWidth)? "portrait" : "landscape";
$(window).on("orientationchange resize", checkOrientation);
var checkOrientation = function() {
  var newOrientation = (window.innerHeight > window.innerWidth)? "portrait" : "landscape";
  if(newOrientation == orientation) { return; } // no change
  setInterval(checkOrientation, 1000); // recheck after 1 second for Android devices
  orientation = newOrientation;
  if(orientation == "portrait") {
    // do something
  }
  else { // portrait
    // do something else
  }
}