Window: deviceorientation event

The deviceorientation event is fired when fresh data is available from an orientation sensor about the current orientation of the device as compared to the Earth coordinate frame. This data is gathered from a magnetometer inside the device. See Orientation and motion data explained for details.

if (window.DeviceOrientationEvent) {
    window.addEventListener("deviceorientation", function(event) {
        // alpha: rotation around z-axis
        var rotateDegrees = event.alpha;
        // gamma: left to right
        var leftToRight = event.gamma;
        // beta: front back motion
        var frontToBack = event.beta;

        handleOrientationEvent(frontToBack, leftToRight, rotateDegrees);
    }, true);
}

var handleOrientationEvent = function(frontToBack, leftToRight, rotateDegrees) {
    // do something amazing
};

• devicemotion
• Detecting device orientation
• Orientation and motion data explained
• Simulating orientation events on desktop browsers with the orientation-devtool