The fetch event is fired when the fetch()
method is called.
This event is not cancelable and does not bubble.
The fetch event is fired when the fetch()
method is called.
This event is not cancelable and does not bubble.
Use the event name in methods like addEventListener()
, or set an event handler property.
addEventListener('fetch', event => { }); onfetch = event => { };
A generic Event
.
serviceWorkerGlobalScope.onfetch = function(fetchEvent) { /* ... */ };
This code snippet is from the service worker prefetch sample (see prefetch example live.) The onfetch
event handler listens for the fetch
event. When fired, the code returns a promise that resolves to the first matching request in the Cache
object. If no match is found, the code fetches a response from the network.
The code also handles exceptions thrown from the fetch()
operation. Note that an HTTP error response (e.g., 404) will not trigger an exception. It will return a normal response object that has the appropriate error code set.
self.addEventListener('fetch', function(event) { console.log('Handling fetch event for', event.request.url); event.respondWith( caches.match(event.request).then(function(response) { if (response) { console.log('Found response in cache:', response); return response; } console.log('No response found in cache. About to fetch from network...'); return fetch(event.request).then(function(response) { console.log('Response from network is:', response); return response; }).catch(function(error) { console.error('Fetching failed:', error); throw error; }); }) ); });
Specification |
---|
Service Workers 1 # dom-serviceworkerglobalscope-onfetch |
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
fetch_event |
40
|
17
|
44
Extended Support Releases (ESR) before Firefox 78 ESR do not support service workers and the Push API.
|
No
|
24
|
11.1
|
40
|
40
|
44
|
24
|
11.3
|
4.0
|
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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorkerGlobalScope/fetch_event