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@ -31,74 +31,29 @@
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<title>material_3_demo</title>
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<link rel="manifest" href="manifest.json">
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<script>
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// The value below is injected by flutter build, do not touch.
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var serviceWorkerVersion = '3920906240';
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</script>
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<!-- This script adds the flutter initialization JS code -->
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<script src="flutter.js" defer></script>
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</head>
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<body>
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<!-- This script installs service_worker.js to provide PWA functionality to
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application. For more information, see:
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https://developers.google.com/web/fundamentals/primers/service-workers -->
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<script>
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var serviceWorkerVersion = '2005348305';
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var scriptLoaded = false;
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function loadMainDartJs() {
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if (scriptLoaded) {
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return;
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}
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scriptLoaded = true;
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var scriptTag = document.createElement('script');
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scriptTag.src = 'main.dart.js';
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scriptTag.type = 'application/javascript';
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document.body.append(scriptTag);
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}
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if ('serviceWorker' in navigator) {
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// Service workers are supported. Use them.
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window.addEventListener('load', function () {
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// Wait for registration to finish before dropping the <script> tag.
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// Otherwise, the browser will load the script multiple times,
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// potentially different versions.
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var serviceWorkerUrl = 'flutter_service_worker.js?v=' + serviceWorkerVersion;
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navigator.serviceWorker.register(serviceWorkerUrl)
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.then((reg) => {
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function waitForActivation(serviceWorker) {
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serviceWorker.addEventListener('statechange', () => {
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if (serviceWorker.state == 'activated') {
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console.log('Installed new service worker.');
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loadMainDartJs();
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}
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});
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}
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if (!reg.active && (reg.installing || reg.waiting)) {
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// No active web worker and we have installed or are installing
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// one for the first time. Simply wait for it to activate.
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waitForActivation(reg.installing || reg.waiting);
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} else if (!reg.active.scriptURL.endsWith(serviceWorkerVersion)) {
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// When the app updates the serviceWorkerVersion changes, so we
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// need to ask the service worker to update.
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console.log('New service worker available.');
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reg.update();
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waitForActivation(reg.installing);
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} else {
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// Existing service worker is still good.
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console.log('Loading app from service worker.');
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loadMainDartJs();
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}
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window.addEventListener('load', function(ev) {
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// Download main.dart.js
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_flutter.loader.loadEntrypoint({
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serviceWorker: {
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serviceWorkerVersion: serviceWorkerVersion,
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},
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onEntrypointLoaded: function(engineInitializer) {
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engineInitializer.initializeEngine().then(function(appRunner) {
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appRunner.runApp();
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});
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// If service worker doesn't succeed in a reasonable amount of time,
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// fallback to plain <script> tag.
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setTimeout(() => {
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if (!scriptLoaded) {
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console.warn(
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'Failed to load app from service worker. Falling back to plain <script> tag.',
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);
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loadMainDartJs();
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}
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}, 4000);
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}
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});
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} else {
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// Service workers not supported. Just drop the <script> tag.
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loadMainDartJs();
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}
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});
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</script>
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</body>
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</html>
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kevmoo
2 years ago