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Service Worker: Cache then Update Strategy
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <meta http-equiv="X-UA-Compatible" content="ie=edge"> | |
| <title>Service Worker</title> | |
| <link rel="stylesheet" href="/style.css"> | |
| </head> | |
| <body> | |
| Test service worker cache and update | |
| <img src="https://image.flaticon.com/icons/svg/1164/1164951.svg" alt="crescent smiling"> | |
| <script src="/script.js"></script> | |
| </body> | |
| </html> |
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| console.log('Test') | |
| if ('serviceWorker' in navigator) { | |
| navigator.serviceWorker.register('sw.js') | |
| } |
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| body { | |
| font-size: 20px; | |
| } | |
| img { | |
| width: 10px; | |
| } |
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| var cacheName = 'cache-and-update' | |
| var filesToCache = [location.origin + '/script.js', location.origin + '/style.css', location.origin] | |
| var getCache = function(callback) { | |
| return caches.open(cacheName).then(callback) | |
| } | |
| var precache = function(event) { | |
| event.waitUntil( | |
| getCache(function(cache) { | |
| return cache.addAll(filesToCache) | |
| }), | |
| ) | |
| } | |
| var updateCache = function(cache, request) { | |
| fetch(request).then(function(response) { | |
| return cache.put(request, response) | |
| }) | |
| } | |
| const arrayContains = (array, text) => { | |
| const result = array.filter(fileToCache => text.indexOf(fileToCache) > -1).length > 0 | |
| return result | |
| } | |
| var fromCacheAndUpdate = function(event) { | |
| // if you don't respondWith it'd be a no-op for the service worker | |
| if (arrayContains(filesToCache, event.request.url)) { | |
| event.respondWith( | |
| getCache(function(cache) { | |
| return cache.match(event.request).then(function(response) { | |
| var notInFilesToCache = response | |
| if (notInFilesToCache) { | |
| updateCache(cache, event.request) | |
| return response | |
| } else { | |
| return fetch(event.request) | |
| } | |
| }) | |
| }), | |
| ) | |
| } | |
| } | |
| self.addEventListener('install', function(event) { | |
| precache(event) | |
| }) | |
| self.addEventListener('fetch', function(event) { | |
| fromCacheAndUpdate(event) | |
| }) |
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