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 addEventListener():
js
addEventListener("activate", (event) => { })
Alternatively, assign to the event handler property of the interface:
js
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 |