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<!DOCTYPE html>
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<html>
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<head>
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<!--
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If you are serving your web app in a path other than the root, change the
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href value below to reflect the base path you are serving from.
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The path provided below has to start and end with a slash "/" in order for
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it to work correctly.
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For more details:
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* https://developer.mozilla.org/en-US/docs/Web/HTML/Element/base
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-->
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<base href="/samples/web/form_app/">
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<meta charset="UTF-8">
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<meta content="IE=Edge" http-equiv="X-UA-Compatible">
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<meta name="description" content="A sample demonstrating different types of forms and best practices">
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<!-- iOS meta tags & icons -->
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<meta name="apple-mobile-web-app-capable" content="yes">
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<meta name="apple-mobile-web-app-status-bar-style" content="black">
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<meta name="apple-mobile-web-app-title" content="form_app">
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<link rel="apple-touch-icon" href="icons/Icon-192.png">
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<title>form_app</title>
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<link rel="manifest" href="manifest.json">
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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 = '3817397293';
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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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});
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// If service worker doesn't succeed in a reasonable amount of time,
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// fallback to plaint <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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} 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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</script>
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</body>
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</html>
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