PWA Fundamentals Topic 29
Table of Contents
Introduction
Progressive Web Apps (PWAs) are web applications that provide a native-like experience to users. They combine the best of web and mobile apps, offering features such as offline capabilities, push notifications, and device hardware access.
Key Concepts
Service Workers
Service workers are scripts that run in the background, separate from the web page, allowing you to intercept network requests and cache resources.
Web App Manifest
The web app manifest is a JSON file that provides metadata about the app, such as the name, icons, and theme color.
HTTPS
PWAs must be served over HTTPS to ensure a secure connection.
Best Practices
- Use a responsive design to ensure the app works on all screen sizes.
- Implement caching strategies to enhance performance.
- Regularly update the service worker to handle changes in the app.
Code Examples
Service Worker Registration
if ('serviceWorker' in navigator) {
window.addEventListener('load', () => {
navigator.serviceWorker.register('/service-worker.js')
.then(registration => {
console.log('Service Worker registered with scope:', registration.scope);
})
.catch(error => {
console.error('Service Worker registration failed:', error);
});
});
}
FAQ
What is a PWA?
A PWA is a web application that behaves like a native app, providing offline access, push notifications, and fast loading times.
Do PWAs require a specific framework?
No, PWAs can be built using any framework or library, but it's essential to implement service workers and a web app manifest.