After your service worker is registered, the browser will try to install & later activate the service worker.
Install event listener
this.addEventListener('install', function(event) {
console.log('installed');
});Caching
One can use this install event returned to cache the assets needed to run the app offline. Below example uses the cache api to do the same.
this.addEventListener('install', function(event) {
event.waitUntil(
caches.open('v1').then(function(cache) {
return cache.addAll([
/* Array of all the assets that needs to be cached */
'/css/style.css',
'/js/app.js',
'/images/snowTroopers.jpg'
]);
})
);
});