mappy/compass.html at master · hackrush/mappy · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Mappy</title>

  <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1.0, user-scalable=no">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
</head>
<body>
<p>
Value = <span id="target"></span>
</p>

<script>
var target = document.getElementById("target")
if (!window.DeviceOrientationEvent) {
  target.innerHTML = "Not supported."
}
target.innerHTML = 'init'
window.addEventListener('deviceorientation', devOrientHandler, false)
function devOrientHandler(event) {
  console.log(event)
  target.innerHTML = event.alpha
  if (event.webkitCompassHeading) {
    alpha = event.webkitCompassHeading;
  }
  //non iOS
  else {
    alpha = event.alpha;
  }
  var locationIcon = myLocationMarker.get('icon');
  locationIcon.rotation = 360 - alpha;
}
</script>
</body>
</html>