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    <p>I hope this isn't coming at you too late, but isn't it frustrating that Safari for iOS 4.2+ will register DeviceOrientationEvent on an iPhone 3GS (or other devices without a gyroscope)?</p> <p>Bottom Line, DeviceOrientation does not work with the iPhone 3GS. But as someone mentioned, DeviceMotionEvent works, but you have to access the event data in a different way than you would with a device with a gyroscope (silly I know!).</p> <p>First Step: I added a variable in the mix to capture whether or not the OrientationEvent was actually firing with any non-null data (as it would if there were a gyroscope).</p> <pre><code>var canHandleOrientation; if (window.DeviceOrientationEvent) { window.addEventListener("deviceorientation", handleOrientation, false); } function handleOrientation(event){ console.log("Orientation:" + event.alpha + ", " + event.beta + ", " + event.gamma); canHandleOrientation = event; // will be either null or with event data } </code></pre> <p>Now you know whether or not the event actually has gyroscope data or not! So if you want to default to something else (ie. window.DeviceMotionEvent) you can use a conditional.</p> <pre><code>if (!canHandleOrientation) { console.log("There is no gyroscope") } </code></pre> <p>I tested this on Mobile Safari for iPhone 3GS (no gyroscope) and iPad 2 (gyroscope) and Chrome on my Macbook Pro (gyroscope). Seems to work.</p> <p>Now, if you want to get the DeviceMotionEvent data as an alternative if the Orientation data is not available, then...</p> <pre><code>if (window.DeviceMotionEvent &amp;&amp; !canHandleOrientation) { window.addEventListener('devicemotion', handleMotion, false); } function handleMotion(event){ if(event.acceleration){ //requires a gyroscope to work. console.log("Motion Acceleration: " + event.acceleration.x + ", " + event.acceleration.y + ", " + event.acceleration.z); } else{ //this is for iPhone 3GS or a device with no gyroscope, and includes gravity. console.log("Motion AccelerationGravity: " + event.accelerationIncludingGravity.x + ", " + event.accelerationIncludingGravity.y + ", " + event.accelerationIncludingGravity.z); } } </code></pre> <p>This should cover your bases for most devices with a webkit browser... I hope. Havent tested it on any Android devices.</p> <p>It should be noted, each event returns different numbers, so you might need to do some work to normalize them. But this is the basics of how you access them.</p> <p>Let me know if this helps!</p>
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    1. POTesting hardware support in Javascript for device orientation events of the iPhone 3GS
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    1. USArjun Mehta
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    1. COHi Arjun! I just want to thank you because you give me really helpful informations in your answer. I hope this post will also help other developpers facing this tricky behaviour in Safari.
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