Quick service worker registration

sw_registration.js

if ('serviceWorker' in navigator) {
    window.addEventListener('load', function() {
        navigator.serviceWorker.register('/sw.js').then(
            function (serviceWorkerRegistration) {
                console.log('service worker has been registered, attempting to register push manager');
                if (!('PushManager' in window)) {
                    console.log('This browser does not support push notifications');
                    return;
                }
                serviceWorkerRegistration.pushManager.subscribe().then(
                    function(pushSubscription) {
                        console.log('Subscribed to push manager');
                        console.log(pushSubscription.endpoint);
                        // The push subscription details needed by the application
                        // server are now available, and can be sent to it using,
                        // for example, an XMLHttpRequest.
                    }, function (error) {
                        console.log('Unable to register push notifications', error);
                    }
                );
            });
    });
}