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https://github.com/Retrospring/retrospring.git
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Show an error page when offline
This commit is contained in:
Karina Kwiatek
parent
95984cfdab
commit
6207863271
2 changed files with 188 additions and 0 deletions
149
public/pwa_offline.html
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149
public/pwa_offline.html
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>You are offline</title>
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<meta name="viewport" content="width=device-width,initial-scale=1">
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<meta name="theme-color" content="#f0edf4">
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<style>
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:root {
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--primary: #5e35b1;
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--muted: 108, 117, 125;
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--background: #f0edf4;
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}
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*, *:before, *:after {
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box-sizing: border-box;
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}
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a {
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color: var(--primary);
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text-decoration: none;
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}
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body {
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padding: 2rem 1rem 1rem 1rem;
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margin: 0;
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font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
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background-color: var(--background);
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}
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.text-primary {
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color: var(--primary);
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}
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.text-muted {
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color: rgb(var(--muted));
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}
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.text-center {
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text-align: center;
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}
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.font-weight-bold {
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font-weight: bold;
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}
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.d-none {
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display: none !important;
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}
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.links {
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padding: 0;
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}
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.links li {
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display: inline-block;
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}
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.links li:not(:last-child):after {
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content: ' • ';
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}
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.mb-0 {
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margin-bottom: 0;
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}
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.mt-0 {
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margin-top: 0;
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}
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.error-artwork-container {
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display:flex;
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justify-content: center;
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max-width: 100%;
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}
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.error-artwork-container picture {
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display: block;
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max-width: 100%;
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}
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.error-artwork-container picture img {
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max-width: 100%;
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}
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.error-text-container {
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text-align: center;
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}
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@media (min-width: 768px) {
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body {
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padding: 3rem 1rem 1rem 1rem;
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}
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.error-artwork-container picture {
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width: 576px;
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}
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}
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@media (min-width: 992px) {
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body {
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padding: 5rem 1rem 3rem 1rem;
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}
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.error {
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display: flex;
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justify-content: center;
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}
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.error-text-container {
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align-self: center;
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text-align: left;
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}
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}
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</style>
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</head>
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<body>
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<div class="error">
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<div class="error-artwork-container">
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<picture>
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<source
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srcset="/images/errors/small/404.png 576w,
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/images/errors/medium/404.png 768w,
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/images/errors/original/404.png 1200w">
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<img src="/images/errors/small/404.png" alt="A raccoon peeking out of a bin, looking confused" />
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</picture>
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</div>
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<div class="error-text-container">
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<h1>
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<span class="text-primary font-weight-bold">404</span>
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<small class="text-muted">You are offline</small>
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</h1>
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<p>
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This content is not available offline.
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</p>
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<ul class="links">
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<li>
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<a href="/">Retry</a>
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</li>
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</ul>
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</div>
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</div>
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<script>
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window.addEventListener('online', () => {
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window.location.reload();
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});
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</script>
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</body>
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</html>
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@ -1,3 +1,14 @@
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const OFFLINE_CACHE_NAME = "offline";
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// Bumping this version will force an update of the service worker
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// eslint-disable-next-line @typescript-eslint/no-unused-vars
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const OFFLINE_PAGE_VERSION = 1;
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const OFFLINE_CACHE_PATHS = [
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"/pwa_offline.html",
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"/images/errors/small/404.png",
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"/images/errors/medium/404.png",
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"/images/errors/original/404.png"
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];
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self.addEventListener('push', function (event) {
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if (event.data) {
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const notification = event.data.json();
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@ -23,3 +34,31 @@ self.addEventListener('notificationclick', async event => {
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console.warn(`Unhandled notification tag: ${event.notification.tag}`);
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}
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});
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self.addEventListener('install', function (event) {
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event.waitUntil(
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(async () => {
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const cache = await caches.open(OFFLINE_CACHE_NAME);
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await cache.addAll(OFFLINE_CACHE_PATHS);
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})()
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);
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// Immediately activate new versions of the service worker instead of waiting
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self.skipWaiting();
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});
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self.addEventListener('fetch', function (event) {
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event.respondWith(
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(async () => {
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try {
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// Try to load the resource
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return await fetch(event.request);
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} catch (error) {
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// Show an error page if offline
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console.log("Fetch failed; returning offline page instead.", error);
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const cache = await caches.open(OFFLINE_CACHE_NAME);
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return await cache.match(OFFLINE_CACHE_PATHS[0]);
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}
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})()
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);
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});
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