window.onload = () => { 'use strict'; if ('serviceWorker' in navigator) { navigator.serviceWorker.register('/sw.js', {scope: './'}).then(function(registration){ console.log('Service worker registration succeeded:', registration); },function(error) { console.log('Service worker registration failed:', error); }); } else { console.log('Service workers are not supported.'); } var deferred_prompt; var btn = document.querySelectorAll('.addToHome')[0]; window.addEventListener('beforeinstallprompt', function(e) { e.preventDefault(); deferred_prompt = e; }); btn.addEventListener('click', function() { if(deferred_prompt !== undefined) { deferred_prompt.prompt(); deferred_prompt.userChoice.then(function(choiceResult) { console.log(choiceResult.outcome); if(choiceResult.outcome == 'dismissed') { console.log('User cancelled home screen install'); } else { console.log('User added to home screen'); } deferred_prompt = null; }); } }); window.addEventListener('appinstalled', (evt) => { console.log("installed...",evt); }); };

https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorkerContainer/register

the sw.js file: var cacheName = 'hello-pwa'; var filesToCache = [ '/index.html', '/2.html', '/css/app.css', '/js/main.js' ]; /* Start the service worker and cache all of the app's content */ self.addEventListener('install', function(e) { console.log(event.request.url); e.waitUntil( caches.open(cacheName).then(function(cache) { return cache.addAll(filesToCache); }) ); }); /* Serve cached content when offline */ self.addEventListener('fetch', function(e) { e.respondWith( caches.match(e.request).then(function(response) { return response || fetch(e.request); }) ); }); 11.10.19

https://developer.mozilla.org/en-US/docs/Web/API/Service_Worker_API/Using_Service_Workers

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