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Service worker with dynamic caching and cache-first load
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| <script> | |
| navigator.serviceWorker.register('sw.js', {scope: '/'}) | |
| .then( | |
| function (registration) { | |
| console.log('Service worker registered!'); | |
| }, | |
| function (err) { | |
| console.error('Installation failed!', err); | |
| } | |
| ); | |
| document.addEventListener('DOMContentLoaded', function(event) { | |
| showLoading(); | |
| var networkDone = false; | |
| var networkRequest = fetch('weather.json') | |
| .then(function(response) { | |
| return response.json(); | |
| }) | |
| .then(function(json) { | |
| networkDone = true; | |
| updatePage(json); | |
| }); | |
| caches.match('weather.json') | |
| .then(function(response) { | |
| if (!response) throw Error('No data'); | |
| return response.json(); | |
| }) | |
| .then(function(json) { | |
| if (!networkDone) updatePage(json); | |
| }) | |
| .catch(function() {return networkRequest;}) | |
| .catch(function() {console.log('We have nothing.');}) | |
| .then(hideLoading); | |
| }); | |
| </script> |
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| self.oninstall = function(event) { | |
| event.waitUntil( | |
| caches.open('static-v1').then(function(cache) { | |
| return cache.addAll([ | |
| '/', | |
| '/index.html', | |
| '/styles.css', | |
| '/main.js', | |
| '/fallback.html' | |
| ]); | |
| }) | |
| ); | |
| } | |
| self.onactivate = function(event) { | |
| var keepList = ['assets-v1']; | |
| event.waitUntil( | |
| caches.keys().then(function(cacheNameList) { | |
| return Promise.all(cacheNameList.map(function(cacheName) { | |
| if (keepList.indexOf(cacheName) === -1) { | |
| return caches.delete(cacheName); | |
| } | |
| })); | |
| }) | |
| ); | |
| } | |
| function fetchAndCache(request) { | |
| return fetch(request).then(function(response) { | |
| caches.open('dynamic').then(function(cache) { | |
| cache.put(request, response); | |
| }); | |
| return response.clone(); | |
| }); | |
| } | |
| self.onfetch = function(event) { | |
| if (event.request.url.indexOf('weather.json') !== -1) { | |
| event.respondWith(fetchAndCache(event.request)); | |
| } else { | |
| event.respondWith( | |
| caches.match(event.request).then(function(response) { | |
| return response || fetchAndCache(event.request); | |
| }) | |
| ); | |
| } | |
| } |
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