Magnetometer

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

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. In addition, this feature may be blocked by a Permissions Policy set on your server.

EventTarget Sensor Magnetometer

Constructor

Magnetometer()

Creates a new Magnetometer object.

Instance properties

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.

Instance methods

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

Events

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

Example

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

js
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();

Specifications

Specification
Magnetometer
# magnetometer-interface

Browser compatibility

desktop mobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Magnetometer
Experimental
Chrome – No support
Chrome 56 (Release date: 2017-01-25)
disabled
disabled From version 56 users must explicitly set the #enable-generic-sensor-extra-classes preference to Enabled. To change preferences in Chrome, visit chrome://flags.
Edge – No support
Edge 79 (Release date: 2020-01-15)
disabled
disabled From version 79 users must explicitly set the #enable-generic-sensor-extra-classes preference to Enabled. To change preferences in Edge, visit about:flags.
Firefox – No support
Firefox
footnote No support
Opera – No support
Opera 43 (Release date: 2017-02-07)
disabled
disabled From version 43 users must explicitly set the #enable-generic-sensor-extra-classes preference to Enabled. To change preferences in Opera, visit opera://flags.
Safari – No support
Safari
footnote No support
Chrome Android – No support
Chrome Android 56 (Release date: 2017-02-01)
disabled
disabled From version 56 users must explicitly set the #enable-generic-sensor-extra-classes preference to Enabled. To change preferences in Chrome Android, visit chrome://flags.
Firefox for Android – No support
Firefox for Android
footnote No support
Opera Android – No support
Opera Android
footnote No support
Safari on iOS – No support
Safari on iOS
footnote No support
Samsung Internet – No support
Samsung Internet
footnote No support
WebView Android – No support
WebView Android
footnote No support
WebView on iOS – No support
WebView on iOS
footnote No support
Magnetometer() constructor
Experimental
Chrome – No support
Chrome 56 (Release date: 2017-01-25)
disabled
disabled From version 56 users must explicitly set the #enable-generic-sensor-extra-classes preference to Enabled. To change preferences in Chrome, visit chrome://flags.
Edge – No support
Edge 79 (Release date: 2020-01-15)
disabled
disabled From version 79 users must explicitly set the #enable-generic-sensor-extra-classes preference to Enabled. To change preferences in Edge, visit about:flags.
Firefox – No support
Firefox
footnote No support
Opera – No support
Opera 43 (Release date: 2017-02-07)
disabled
disabled From version 43 users must explicitly set the #enable-generic-sensor-extra-classes preference to Enabled. To change preferences in Opera, visit opera://flags.
Safari – No support
Safari
footnote No support
Chrome Android – No support
Chrome Android 56 (Release date: 2017-02-01)
disabled
disabled From version 56 users must explicitly set the #enable-generic-sensor-extra-classes preference to Enabled. To change preferences in Chrome Android, visit chrome://flags.
Firefox for Android – No support
Firefox for Android
footnote No support
Opera Android – No support
Opera Android
footnote No support
Safari on iOS – No support
Safari on iOS
footnote No support
Samsung Internet – No support
Samsung Internet
footnote No support
WebView Android – No support
WebView Android
footnote No support
WebView on iOS – No support
WebView on iOS
footnote No support
x
Experimental
Chrome – No support
Chrome 56 (Release date: 2017-01-25)
disabled
disabled From version 56 users must explicitly set the #enable-generic-sensor-extra-classes preference to Enabled. To change preferences in Chrome, visit chrome://flags.
Edge – No support
Edge 79 (Release date: 2020-01-15)
disabled
disabled From version 79 users must explicitly set the #enable-generic-sensor-extra-classes preference to Enabled. To change preferences in Edge, visit about:flags.
Firefox – No support
Firefox
footnote No support
Opera – No support
Opera 43 (Release date: 2017-02-07)
disabled
disabled From version 43 users must explicitly set the #enable-generic-sensor-extra-classes preference to Enabled. To change preferences in Opera, visit opera://flags.
Safari – No support
Safari
footnote No support
Chrome Android – No support
Chrome Android 56 (Release date: 2017-02-01)
disabled
disabled From version 56 users must explicitly set the #enable-generic-sensor-extra-classes preference to Enabled. To change preferences in Chrome Android, visit chrome://flags.
Firefox for Android – No support
Firefox for Android
footnote No support
Opera Android – No support
Opera Android
footnote No support
Safari on iOS – No support
Safari on iOS
footnote No support
Samsung Internet – No support
Samsung Internet
footnote No support
WebView Android – No support
WebView Android
footnote No support
WebView on iOS – No support
WebView on iOS
footnote No support
y
Experimental
Chrome – No support
Chrome 56 (Release date: 2017-01-25)
disabled
disabled From version 56 users must explicitly set the #enable-generic-sensor-extra-classes preference to Enabled. To change preferences in Chrome, visit chrome://flags.
Edge – No support
Edge 79 (Release date: 2020-01-15)
disabled
disabled From version 79 users must explicitly set the #enable-generic-sensor-extra-classes preference to Enabled. To change preferences in Edge, visit about:flags.
Firefox – No support
Firefox
footnote No support
Opera – No support
Opera 43 (Release date: 2017-02-07)
disabled
disabled From version 43 users must explicitly set the #enable-generic-sensor-extra-classes preference to Enabled. To change preferences in Opera, visit opera://flags.
Safari – No support
Safari
footnote No support
Chrome Android – No support
Chrome Android 56 (Release date: 2017-02-01)
disabled
disabled From version 56 users must explicitly set the #enable-generic-sensor-extra-classes preference to Enabled. To change preferences in Chrome Android, visit chrome://flags.
Firefox for Android – No support
Firefox for Android
footnote No support
Opera Android – No support
Opera Android
footnote No support
Safari on iOS – No support
Safari on iOS
footnote No support
Samsung Internet – No support
Samsung Internet
footnote No support
WebView Android – No support
WebView Android
footnote No support
WebView on iOS – No support
WebView on iOS
footnote No support
z
Experimental
Chrome – No support
Chrome 56 (Release date: 2017-01-25)
disabled
disabled From version 56 users must explicitly set the #enable-generic-sensor-extra-classes preference to Enabled. To change preferences in Chrome, visit chrome://flags.
Edge – No support
Edge 79 (Release date: 2020-01-15)
disabled
disabled From version 79 users must explicitly set the #enable-generic-sensor-extra-classes preference to Enabled. To change preferences in Edge, visit about:flags.
Firefox – No support
Firefox
footnote No support
Opera – No support
Opera 43 (Release date: 2017-02-07)
disabled
disabled From version 43 users must explicitly set the #enable-generic-sensor-extra-classes preference to Enabled. To change preferences in Opera, visit opera://flags.
Safari – No support
Safari
footnote No support
Chrome Android – No support
Chrome Android 56 (Release date: 2017-02-01)
disabled
disabled From version 56 users must explicitly set the #enable-generic-sensor-extra-classes preference to Enabled. To change preferences in Chrome Android, visit chrome://flags.
Firefox for Android – No support
Firefox for Android
footnote No support
Opera Android – No support
Opera Android
footnote No support
Safari on iOS – No support
Safari on iOS
footnote No support
Samsung Internet – No support
Samsung Internet
footnote No support
WebView Android – No support
WebView Android
footnote No support
WebView on iOS – No support
WebView on iOS
footnote No support

Legend

Tip: you can click/tap on a cell for more information.

No support
No support
Experimental. Expect behavior to change in the future.
User must explicitly enable this feature.