IdleDetector: change 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.

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The change event of the IdleDetector interface fires when the value of userState or screenState has changed.


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

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

onchange = (event) => {};

Event type

A generic Event.


In the following example, the change callback prints the status of userState and screenState to the console.

idleDetector.addEventListener("change", () => {
  const userState = idleDetector.userState;
  const screenState = idleDetector.screenState;
  console.log(`Idle change: ${userState}, ${screenState}.`);


Idle Detection API
# api-idledetector-onchange

Browser compatibility

BCD tables only load in the browser