How do I correctly detect orientation change using Phonegap on iOS?

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This is what I do:

function doOnOrientationChange() {
    switch(window.orientation) {  
      case -90: case 90:
        alert('landscape');
        break; 
      default:
        alert('portrait');
        break; 
    }
}
  
window.addEventListener('orientationchange', doOnOrientationChange);
  
// Initial execution if needed
doOnOrientationChange();

Update May 2019: window.orientation is a deprecated feature and not supported by most browsers according to MDN. The orientationchange event is associated with window.orientation and therefore should probably not be used.

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