Sensor: activate event

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.

The activate event is fired when a sensor becomes activated. It means that it will start obtaining readings.

The Sensor interface is a base class, onactivate and the activate event may only be used on one of the derived classes.

Syntax

Use the event name in methods like addEventListener(), or set an event handler property.

js
addEventListener("activate", (event) => {});

onactivate = (event) => {};

Event type

A generic Event with no added properties.

Examples

Log when an accelerometer is ready to measure

This example adds an event listener to log the activation of an Accelerometer.

js
const acl = new Accelerometer({ frequency: 60 });
acl.addEventListener("activate", () => console.log("Ready to measure."));
acl.start();

Specifications

Specification
Generic Sensor API
# sensor-onactivate

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
activate event

Legend

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

Full support
Full support
No support
No support

See also