Installable Web Apps - Topic 28

Introduction

Installable Web Apps (PWAs) are web applications that can be installed on a user’s device, providing a native app-like experience. They are built using standard web technologies including HTML, CSS, and JavaScript.

Key Concepts

Step-by-Step Installation

1. Create a Web App Manifest

The manifest file (manifest.json) provides important metadata about the app.

{
    "name": "My Installable App",
    "short_name": "App",
    "start_url": "/index.html",
    "display": "standalone",
    "background_color": "#ffffff",
    "theme_color": "#000000",
    "icons": [
        {
            "src": "icon.png",
            "sizes": "192x192",
            "type": "image/png"
        }
    ]
}

2. Register a Service Worker

Service Workers allow your app to work offline and handle push notifications.

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

3. Testing Installation

To test your installable web app, ensure you are serving it over HTTPS and use the Application tab in Chrome DevTools to verify the manifest and service worker.

Best Practices

• Always use HTTPS for security.
• Ensure your app is responsive to fit various screen sizes.
• Optimize images and assets for better performance.
• Provide a clear and engaging user experience.

FAQ