Sensor: reading event

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

The reading event is fired when a new reading is available on a sensor.

The Sensor interface is a base class, onreading and the reading 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("reading", (event) => {});

onreading = (event) => {};

Event type

A generic Event with no added properties.


Reading acceleration

This example adds an event listener to read acceleration values of an Accelerometer. It reads sixty times a second.

const acl = new Accelerometer({ frequency: 60 });
acl.addEventListener("reading", () => {
  console.log(`Acceleration along the X-axis ${acl.x}`);
  console.log(`Acceleration along the Y-axis ${acl.y}`);
  console.log(`Acceleration along the Z-axis ${acl.z}`);


Generic Sensor API
# sensor-onreading

Browser compatibility

BCD tables only load in the browser

See also