Sensor APIs

if (typeof Gyroscope === "function") {
  // run in circles...
}

if ("ProximitySensor" in window) {
  // watch out!
}

if (window.AmbientLightSensor) {
  // go dark...
}

navigator.permissions.query({ name: 'accelerometer' })
.then(result => {
  if (result.state === 'denied') {
    console.log('Permission to use accelerometer sensor is denied.');
    return;
  }
  // Use the sensor.
}

const sensor = new AbsoluteOrientationSensor();
sensor.start();
sensor.onerror = (event) => {
  if (event.error.name === "SecurityError")
    console.log("No permissions to use AbsoluteOrientationSensor.");
};

let magSensor = new Magnetometer({ frequency: 60 });

magSensor.addEventListener("reading", (e) => {
  console.log("Magnetic field along the X-axis " + magSensor.x);
  console.log("Magnetic field along the Y-axis " + magSensor.y);
  console.log("Magnetic field along the Z-axis " + magSensor.z);
});
magSensor.addEventListener("error", (event) => {
  console.log(event.error.name, event.error.message);
});
magSensor.start();

let accelerometer = null;
try {
  accelerometer = new Accelerometer({ referenceFrame: "device" });
  accelerometer.addEventListener("error", (event) => {
    // Handle runtime errors.
    if (event.error.name === "NotAllowedError") {
      // Branch to code for requesting permission.
    } else if (event.error.name === "NotReadableError") {
      console.log("Cannot connect to the sensor.");
    }
  });
  accelerometer.addEventListener("reading", () => reloadOnShake(accelerometer));
  accelerometer.start();
} catch (error) {
  // Handle construction errors.
  if (error.name === "SecurityError") {
    // See the note above about feature policy.
    console.log("Sensor construction was blocked by a feature policy.");
  } else if (error.name === "ReferenceError") {
    console.log("Sensor is not supported by the User Agent.");
  } else {
    throw error;
  }
}