69 строки
2.1 KiB
JavaScript
69 строки
2.1 KiB
JavaScript
var CACHE_NAME = 'notifications';
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// On install, create the 'notifications' cache that will be used to store the Number
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// of notifications received.
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self.addEventListener('install', function(event) {
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event.waitUntil(
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caches.open(CACHE_NAME).then(function(cache) {
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return Promise.all([
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// We create a fake request and response to store the info.
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cache.put(new Request('invisible'), new Response('0', {
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headers: {
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'content-type': 'application/json'
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}
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})),
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cache.put(new Request('visible'), new Response('0', {
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headers: {
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'content-type': 'application/json'
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}
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})),
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]);
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})
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);
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});
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self.addEventListener('activate', function(event) {
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event.waitUntil(self.clients.claim);
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});
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function updateNumber(type) {
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// Update the number of notifications received of type 'type' (visible or invisible).
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return caches.open(CACHE_NAME).then(function(cache) {
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return cache.match(type).then(function(response) {
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return response.json().then(function(notificationNum) {
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var newNotificationNum = notificationNum + 1;
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return cache.put(
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new Request(type),
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new Response(JSON.stringify(newNotificationNum), {
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headers: {
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'content-type': 'application/json',
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},
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})
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).then(function() {
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return newNotificationNum;
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});
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});
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});
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});
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}
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// Register event listener for the 'push' event.
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self.addEventListener('push', function(event) {
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// Retrieve the payload from event.data (a PushMessageData object) as a JSON object.
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var visible = event.data ? event.data.json() : false;
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// Keep the service worker alive until the 'notifications' cache is updated and,
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// if visible is true, the notification is created.
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if (visible) {
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event.waitUntil(updateNumber('visible').then(function(num) {
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return self.registration.showNotification('ServiceWorker Cookbook', {
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body: 'Received ' + num + ' visible notifications',
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});
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}));
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} else {
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event.waitUntil(updateNumber('invisible'));
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}
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});
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