ServiceWorkerRegistration.index

The index read-only property of the ServiceWorkerRegistration interface returns a reference to the ContentIndex interface, which allows for indexing of offline content.

Syntax

var A ContentIndex object = ServiceWorkerRegistration.index;

Value

A ContentIndex Object

Examples

You can access the property from either your main script or the registered service worker.

Here is an example from the main script:

// reference registration
const registration = await navigator.serviceWorker.ready;

// feature detection
if ('index' in registration) {

  // Content Index API functionality
  const contentIndex = registration.index;

}

From the service worker:

// service worker script

const contentIndex = self.registration.index;

Specifications

Browser compatibility

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See also

• Content Index API
• An introductory article on the Content Index API
• An app which uses the Content Index API to list and remove 'save for later' content