ServiceWorkerRegistration.active

The active property of the ServiceWorkerRegistration interface returns a service worker whose ServiceWorker.state is activating or activated. This property is initially set to null.

An active worker controls a Client if the client's URL falls within the scope of the registration (the scope option set when ServiceWorkerContainer.register is first called.)

Note: This feature is available in Web Workers.

Note: Once an active worker is activating, neither a runtime script error nor a force termination of the active worker prevents the active worker from getting activated.

Syntax

var serviceWorker = serviceWorkerRegistration.active;

Value

A ServiceWorker object's property, if it is currently in an activating or activated state.

Specifications

Specification
Service Workers 1
# navigator-service-worker-active

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
active
40
17
44
Extended Support Releases (ESR) before Firefox 78 ESR do not support service workers and the Push API.
No
27
11.1
40
40
44
27
11.3
4.0

See also

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https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorkerRegistration/active