Detecting if a device is able to change orientation in JavaScript

Question

Is there a native JavaScript (or through the use of a library such as JQuery/Modernizr etc) way to detect if a device is capable of changing orientation? I would like to use

Answer 1

Detecting mobile devices:

1. Simple browser sniffing

   if (/mobile/i.test(navigator.userAgent)) {...}
   

2. jQuery.browser.mobile plug-in (exhaustive browser sniffing)

3. Simple test for touch events

   if ('ontouchstart' in window) {...}
   

4. Advanced test for touch events:

   if (('ontouchstart' in window) ||     // Advanced test for touch events
      (window.DocumentTouch && document instanceof DocumentTouch) ||
      ((hash['touch'] && hash['touch'].offsetTop) === 9)) {...}
   

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Optionally use onorientationchange for #3 and #4 above.

Combine 1 or more of these (and any other approaches) as needed. None of them are foolproof.