| <!DOCTYPE HTML> |
| <!-- Copyright 2014 The Flutter Authors. All rights reserved. |
| Use of this source code is governed by a BSD-style license that can be |
| found in the LICENSE file. --> |
| <html> |
| <head> |
| <meta charset="UTF-8"> |
| <meta content="IE=Edge" http-equiv="X-UA-Compatible"> |
| |
| <title>Web Test</title> |
| <!-- iOS meta tags & icons --> |
| <meta name="apple-mobile-web-app-capable" content="yes"> |
| <meta name="apple-mobile-web-app-status-bar-style" content="black"> |
| <meta name="apple-mobile-web-app-title" content="Web Test"> |
| <link rel="manifest" href="manifest.json"> |
| </head> |
| <body> |
| <!-- This script installs service_worker.js to provide PWA functionality to |
| application. For more information, see: |
| https://developers.google.com/web/fundamentals/primers/service-workers --> |
| <script> |
| var serviceWorkerVersion = null; |
| var scriptLoaded = false; |
| function loadMainDartJs() { |
| if (scriptLoaded) { |
| return; |
| } |
| scriptLoaded = true; |
| var scriptTag = document.createElement('script'); |
| scriptTag.src = 'main.dart.js'; |
| scriptTag.type = 'application/javascript'; |
| document.body.append(scriptTag); |
| } |
| |
| if ('serviceWorker' in navigator) { |
| // Service workers are supported. Use them. |
| window.addEventListener('load', function () { |
| // Wait for registration to finish before dropping the <script> tag. |
| // Otherwise, the browser will load the script multiple times, |
| // potentially different versions. |
| var serviceWorkerUrl = 'flutter_service_worker.js?v=' + serviceWorkerVersion; |
| navigator.serviceWorker.register(serviceWorkerUrl) |
| .then((reg) => { |
| function waitForActivation(serviceWorker) { |
| serviceWorker.addEventListener('statechange', () => { |
| if (serviceWorker.state == 'activated') { |
| console.log('Installed new service worker.'); |
| loadMainDartJs(); |
| } |
| }); |
| } |
| if (!reg.active && (reg.installing || reg.waiting)) { |
| // No active web worker and we have installed or are installing |
| // one for the first time. Simply wait for it to activate. |
| waitForActivation(reg.installing ?? reg.waiting); |
| } else if (!reg.active.scriptURL.endsWith(serviceWorkerVersion)) { |
| // When the app updates the serviceWorkerVersion changes, so we |
| // need to ask the service worker to update. |
| console.log('New service worker available.'); |
| reg.update(); |
| waitForActivation(reg.installing); |
| } else { |
| // Existing service worker is still good. |
| console.log('Loading app from service worker.'); |
| loadMainDartJs(); |
| } |
| }); |
| |
| // If service worker doesn't succeed in a reasonable amount of time, |
| // fallback to plaint <script> tag. |
| setTimeout(() => { |
| if (!scriptLoaded) { |
| console.warn( |
| 'Failed to load app from service worker. Falling back to plain <script> tag.', |
| ); |
| loadMainDartJs(); |
| } |
| }, 4000); |
| }); |
| } else { |
| // Service workers not supported. Just drop the <script> tag. |
| loadMainDartJs(); |
| } |
| </script> |
| </body> |
| </html> |
