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.
Note: This feature is available in Dedicated Web Workers.
The change event of the IdleDetector interface fires when the value of userState or screenState has changed.
Syntax
Use the event name in addEventListener():
js
addEventListener("change", (event) => { })
Alternatively, assign to the event handler property of the interface:
js
onchange = (event) => { }
Event type
A generic Event.
Example
In the following example, the change callback prints the status of userState and screenState to the console.
js
idleDetector.addEventListener("change", () => {
const userState = idleDetector.userState;
const screenState = idleDetector.screenState;
console.log(`Idle change: ${userState}, ${screenState}.`);
});
Specifications
| Specification |
|---|
| Idle Detection API # api-idledetector-onchange |