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<html> | |
<head> | |
<!-- | |
If you are serving your web app in a path other than the root, change the | |
href value below to reflect the base path you are serving from. | |
The path provided below has to start and end with a slash "/" in order for | |
it to work correctly. | |
For more details: | |
* https://developer.mozilla.org/en-US/docs/Web/HTML/Element/base | |
This is a placeholder for base href that will be replaced by the value of | |
the `--base-href` argument provided to `flutter build`. | |
--> | |
<base href="/"> | |
<meta charset="UTF-8"> | |
<meta content="IE=Edge" http-equiv="X-UA-Compatible"> | |
<meta name="description" content="A PlainBagel project template for Flutter"> | |
<!-- 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="Plain Bagel flutter template"> | |
<link rel="apple-touch-icon" href="icons/Icon-192.png"> | |
<!-- Favicon --> | |
<link rel="icon" type="image/png" href="favicon.png" /> | |
<title>Picka Friends</title> | |
<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> | |
const serviceWorkerVersion = "3841224055"; | |
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> |