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> |