Sensor: activate event

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.


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

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

onactivate = (event) => {};

Event type

A generic Event with no added properties.


Log when an accelerometer is ready to measure

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

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


Generic Sensor API
# sensor-onactivate

Browser compatibility

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See also