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May 15, 2019 09:37
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An exemple of a service worker that always tries to fetch results, fallbacking to cache only if theres a fetch error.
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const CACHE_VERSION = 'cache_version_1'; | |
self.addEventListener('install', (event) => { | |
console.log('service worker install'); | |
if(!caches in self) { | |
return; | |
} | |
event.waitUntil( | |
caches.open(CACHE_VERSION) | |
.then(cache => { | |
return cache.addAll([ | |
'/', | |
'/login/pt/' | |
]); | |
}) | |
.catch(error => console.log(error)) | |
); | |
}); | |
self.addEventListener('activate', (event) => { | |
console.log('service worker activate'); | |
event.waitUntil( | |
caches.keys() | |
.then(cacheKeys => { | |
return Promise.all( | |
cacheKeys.map(cacheKey => { | |
if(cacheKey !== CACHE_VERSION) { | |
return caches.delete(cacheKey); | |
} | |
}) | |
); | |
}) | |
); | |
}); | |
self.addEventListener('fetch', (event) => { | |
console.log('Service worker fetching: ', event.request.method); | |
if(event.request.method !== 'POST') { | |
event.respondWith( | |
fetch(event.request) | |
.then(response => { | |
caches.open(CACHE_VERSION) | |
.then(cache => cache.put(event.request, response.clone())); | |
return response.clone(); | |
}) | |
.catch(() => { | |
return caches.match(event.request) | |
.then(response => { | |
return response || new Response('App offline'); | |
}) | |
}) | |
) | |
} | |
}); |
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