|
| 1 | +<!DOCTYPE html> |
| 2 | +<html> |
| 3 | +<head> |
| 4 | + <!-- |
| 5 | + If you are serving your web app in a path other than the root, change the |
| 6 | + href value below to reflect the base path you are serving from. |
| 7 | +
|
| 8 | + The path provided below has to start and end with a slash "/" in order for |
| 9 | + it to work correctly. |
| 10 | +
|
| 11 | + For more details: |
| 12 | + * https://developer.mozilla.org/en-US/docs/Web/HTML/Element/base |
| 13 | +
|
| 14 | + This is a placeholder for base href that will be replaced by the value of |
| 15 | + the `--base-href` argument provided to `flutter build`. |
| 16 | + --> |
| 17 | + <base href="$FLUTTER_BASE_HREF"> |
| 18 | + |
| 19 | + <meta charset="UTF-8"> |
| 20 | + <meta content="IE=Edge" http-equiv="X-UA-Compatible"> |
| 21 | + <meta name="description" content="A new Flutter project."> |
| 22 | + |
| 23 | + <!-- iOS meta tags & icons --> |
| 24 | + <meta name="apple-mobile-web-app-capable" content="yes"> |
| 25 | + <meta name="apple-mobile-web-app-status-bar-style" content="black"> |
| 26 | + <meta name="apple-mobile-web-app-title" content="example"> |
| 27 | + <link rel="apple-touch-icon" href="icons/Icon-192.png"> |
| 28 | + |
| 29 | + <title>example</title> |
| 30 | + <link rel="manifest" href="manifest.json"> |
| 31 | +</head> |
| 32 | +<body> |
| 33 | + <!-- This script installs service_worker.js to provide PWA functionality to |
| 34 | + application. For more information, see: |
| 35 | + https://developers.google.com/web/fundamentals/primers/service-workers --> |
| 36 | + <script> |
| 37 | + var serviceWorkerVersion = null; |
| 38 | + var scriptLoaded = false; |
| 39 | + function loadMainDartJs() { |
| 40 | + if (scriptLoaded) { |
| 41 | + return; |
| 42 | + } |
| 43 | + scriptLoaded = true; |
| 44 | + var scriptTag = document.createElement('script'); |
| 45 | + scriptTag.src = 'main.dart.js'; |
| 46 | + scriptTag.type = 'application/javascript'; |
| 47 | + document.body.append(scriptTag); |
| 48 | + } |
| 49 | + |
| 50 | + if ('serviceWorker' in navigator) { |
| 51 | + // Service workers are supported. Use them. |
| 52 | + window.addEventListener('load', function () { |
| 53 | + // Wait for registration to finish before dropping the <script> tag. |
| 54 | + // Otherwise, the browser will load the script multiple times, |
| 55 | + // potentially different versions. |
| 56 | + var serviceWorkerUrl = 'flutter_service_worker.js?v=' + serviceWorkerVersion; |
| 57 | + navigator.serviceWorker.register(serviceWorkerUrl) |
| 58 | + .then((reg) => { |
| 59 | + function waitForActivation(serviceWorker) { |
| 60 | + serviceWorker.addEventListener('statechange', () => { |
| 61 | + if (serviceWorker.state == 'activated') { |
| 62 | + console.log('Installed new service worker.'); |
| 63 | + loadMainDartJs(); |
| 64 | + } |
| 65 | + }); |
| 66 | + } |
| 67 | + if (!reg.active && (reg.installing || reg.waiting)) { |
| 68 | + // No active web worker and we have installed or are installing |
| 69 | + // one for the first time. Simply wait for it to activate. |
| 70 | + waitForActivation(reg.installing || reg.waiting); |
| 71 | + } else if (!reg.active.scriptURL.endsWith(serviceWorkerVersion)) { |
| 72 | + // When the app updates the serviceWorkerVersion changes, so we |
| 73 | + // need to ask the service worker to update. |
| 74 | + console.log('New service worker available.'); |
| 75 | + reg.update(); |
| 76 | + waitForActivation(reg.installing); |
| 77 | + } else { |
| 78 | + // Existing service worker is still good. |
| 79 | + console.log('Loading app from service worker.'); |
| 80 | + loadMainDartJs(); |
| 81 | + } |
| 82 | + }); |
| 83 | + |
| 84 | + // If service worker doesn't succeed in a reasonable amount of time, |
| 85 | + // fallback to plaint <script> tag. |
| 86 | + setTimeout(() => { |
| 87 | + if (!scriptLoaded) { |
| 88 | + console.warn( |
| 89 | + 'Failed to load app from service worker. Falling back to plain <script> tag.', |
| 90 | + ); |
| 91 | + loadMainDartJs(); |
| 92 | + } |
| 93 | + }, 4000); |
| 94 | + }); |
| 95 | + } else { |
| 96 | + // Service workers not supported. Just drop the <script> tag. |
| 97 | + loadMainDartJs(); |
| 98 | + } |
| 99 | + </script> |
| 100 | +</body> |
| 101 | +</html> |
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