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Service Workers Example
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>Server A</title> | |
| <link href='https://fonts.googleapis.com/css?family=Ravi+Prakash' rel='stylesheet' type='text/css'> | |
| <style> | |
| p { | |
| font-family: 'Ravi Prakash', serif; | |
| font-size: 6em; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <p>Server A</p> | |
| <script src="registersw.js"></script> | |
| <script src="http://localhost:8080/exjs.js"></script> | |
| <script src="https://unpkg.com/react@15.5.4/dist/react.js"></script> | |
| </body> | |
| </html> |
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| if ('serviceWorker' in navigator) { | |
| navigator.serviceWorker | |
| .register('./sw.js') | |
| .then(registration => console.log('ServiceWorker registration successful with scope: ', registration.scope)) | |
| .catch(err => console.log("Service Worker Failed to Register", err)) | |
| } |
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| // https://developer.mozilla.org/en-US/docs/Web/API/Service_Worker_API/Using_Service_Workers | |
| // https://mobiforge.com/design-development/taking-web-offline-service-workers | |
| // https://www.youtube.com/watch?v=BfL3pprhnms | |
| // chrome://serviceworker-internals/ | |
| const CACHE_NAME = "V1" | |
| const preCache = [ | |
| './', | |
| './index.html', | |
| 'http://localhost:8080/exjs.js', | |
| 'https://unpkg.com/react@15.5.4/dist/react.js', | |
| 'https://fonts.googleapis.com/css?family=Ravi+Prakash' | |
| ] | |
| const OFFLINE_FILE = '/index.html' | |
| self.addEventListener('install', event => { | |
| event.waitUntil( | |
| caches.open(CACHE_NAME) | |
| .then(cache => cache.addAll(preCache)) | |
| .catch(cache => console.log("ERROROROROR", cache)) | |
| ); | |
| }); | |
| self.addEventListener('fetch', event => { | |
| event.respondWith( | |
| caches.match(event.request) | |
| .then(response => response || fetch(event.request)) | |
| .catch(() => caches.match(OFFLINE_FILE)) | |
| ) | |
| }) | |
| self.addEventListener('activate', event => { | |
| event.waitUntil( | |
| // Version our caches by removing old ones | |
| caches.keys().then(cacheKeys => { | |
| return Promise.all( | |
| cacheKeys | |
| .filter(cacheName => (cacheName !== CACHE_NAME)) | |
| .map(cacheName => caches.delete(cacheName)) | |
| ) | |
| }) | |
| ); | |
| }); | |
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