NavigationPreloadManager.enable()

The enable() method of the NavigationPreloadManager interface is used to enable preloading of resources managed by the service worker. It returns a promise that resolves with undefined.

The method should be called in the service worker's activate event handler, which ensures it is called before any fetch event handler can fire.

Syntax

enable()

Parameters

None.

Return value

A Promise that resolves with undefined.

Exceptions

InvalidStateError DOMException

There is no active worker associated with the registration to which this NavigationPreloadManager belongs.

Examples

The code below shows how to enable preloading, after first using ServiceWorkerRegistration.navigationPreload to test that it is supported.

addEventListener('activate', (event) => {
  event.waitUntil((async () => {
    if (self.registration.navigationPreload) {
      // Enable navigation preloads!
      await self.registration.navigationPreload.enable();
    }
  })());
});

Specifications

Specification
Service Workers
# dom-navigationpreloadmanager-enable

Browser compatibility

BCD tables only load in the browser

See also