Magnetometer

The Magnetometer interface of the Sensor APIs provides information about the magnetic field as detected by the device's primary magnetometer sensor.

To use this sensor, the user must grant permission to the 'magnetometer' device sensor through the Permissions API.

If a feature policy blocks use of a feature, it's because your code is inconsistent with the policies set on your server. This is not something that would ever be shown to a user. The Feature-Policy HTTP header article contains implementation instructions.

Magnetometer()

Creates a new Magnetometer object.

Magnetometer.x Read only

Returns a double containing the magnetic field around the device's x axis.

Magnetometer.y Read only

Returns a double containing the magnetic field around the device's y axis.

Magnetometer.z Read only

Returns a double containing the magnetic field around the device's z axis.

Magnetometer doesn't have own methods. However, it inherits methods from its parent interfaces, Sensor and EventTarget.

Magnetometer doesn't have own events. However, it inherits events from its parent interface, Sensor.

The magnetometer is typically read in the reading event callback. In the example below this occurs sixty times a second.

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.start();