NavigationPreloadManager: enable() method
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since April 2022.
Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
Note: This feature is available in Web Workers.
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
Exceptions
InvalidStateErrorDOMException-
There is no active worker associated with the registration to which this
NavigationPreloadManagerbelongs.
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 Nightly # dom-navigationpreloadmanager-enable |
Browser compatibility
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enable
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Legend
Tip: you can click/tap on a cell for more information.
- Full support
- Full support
See also
NavigationPreloadManager.disable()