PWA Fundamentals Topic 26

What is a PWA?

A Progressive Web App is a type of application software delivered through the web, built using common web technologies including HTML, CSS, and JavaScript.

Core Principles

• Responsive: PWAs should work on any device with a screen.
• Connectivity independent: They can work offline or on low-quality networks.
• App-like experience: They should feel like a native application.
• Fresh: Always up-to-date due to service workers.
• Safe: Served via HTTPS to ensure security.
• Discoverable: Can be found through search engines.
• Re-engageable: Supports push notifications.
• Installable: Users can add them to their home screen.

Step-by-Step Implementation

1. Set up a web server to serve your application.
2. Create a manifest file for the PWA.
3. Register a service worker to handle caching and offline functionality.
4. Implement responsive design techniques.
5. Test the application across various devices and browsers.

Sample Code: Service Worker Registration

if ('serviceWorker' in navigator) {
    window.addEventListener('load', function() {
        navigator.serviceWorker.register('/service-worker.js').then(function(registration) {
            console.log('ServiceWorker registration successful with scope: ', registration.scope);
        }, function(err) {
            console.log('ServiceWorker registration failed: ', err);
        });
    });
}