What's all the buzz about PWA about?

Imagine this: You're on the subway, you try to access a website on your cell phone, but the internet signal keeps dropping. Frustrating, right?
This is where Progressive Web App comes in, the superhero of the web world. It works offline, loads at lightning speed, and even sends notifications. It's like giving your website superpowers!

The origin of PWA

Let's go back in time (like, in 2015), the options were: build a website or build an app. That was like choosing between a bike or a car. Then some smart people at Google thought, "Why not both?" and thus, PWA was born!

Let's build our first PWA: Starting the adventure

Let's roll up our sleeves and build a simple PWA together.
Let's create a "Bad Jokes" app because, well, who doesn't like a bad joke?

Part 1: The Basics - Just a simple webpage

First, let's create some basic HTML. This is our "bike" - it works, but it's not super powerful yet.

       
  
Dad Jokes
 
Click the button for a dad joke!
 Get New Joke   

Part 2: Add some styles - Because every bad joke needs a good look.

Let's add a touch of CSS to make our application more elegant:

body { font-family: Arial, sans-serif; text-align: center; padding: 20px; } #joke { margin: 20px 0; font-style: italic; } button { padding: 10px 20px; font-size: 16px; cursor: pointer; }

Part 3: The magic of javascript = Request bad jokes

Now, let's add a little JavaScript to make a request to an API that will return the jokes:

const jokeElement = document.getElementById('joke'); const jokeBtn = document.getElementById('jokeBtn'); async function fetchJoke() { try { const response = await fetch('https://icanhazdadjoke.com/', { headers: { 'Accept': 'application/json' } }); const data = await response.json(); jokeElement.textContent = data.joke; } catch (error) { jokeElement.textContent = "Oops! Looks like the joke got stuck in dad's old briefcase."; } } jokeBtn.addEventListener('click', fetchJoke); // Faz o request na API quando a página carrega fetchJoke();

Step 4: Transforming into PWA - A dash of superpowers

Now, let's transform our normal website into a PWA. First, we need a manifest file. Create a file called manifest.json:

{ "name": "Dad Jokes PWA", "short_name": "DadJokes", "start_url": "/", "display": "standalone", "background_color": "#ffffff", "theme_color": "#4285f4", "icons": [ { "src": "icon.png", "sizes": "192x192", "type": "image/png" } ] }

Don't forget to add the manifest link in the HTML file

Step 5: The secret sauce: Service Workers

Service workers are like little invisible butlers of the web. They cache your assets and even work offline. Create a file called service-worker.js:

const CACHE_NAME = 'dad-jokes-cache-v1'; const urlsToCache = [ '/', '/index.html', '/style.css', '/app.js', '/icon.png' ]; self.addEventListener('install', event => { event.waitUntil( caches.open(CACHE_NAME) .then(cache => cache.addAll(urlsToCache)) ); }); self.addEventListener('fetch', event => { event.respondWith( caches.match(event.request) .then(response => response || fetch(event.request)) ); });

Now, register the service worker in your app.js file

if ('serviceWorker' in navigator) { window.addEventListener('load', () => { navigator.serviceWorker.register('/service-worker.js') .then(registration => console.log('ServiceWorker registered')) .catch(error => console.log('ServiceWorker registration failed:', error)); }); }

Testing PWA Superpowers

• Offline Mode: Turn off the internet and refresh the page. Your app should still work!
• Installation prompt: In supported browsers, you will see an option to install your PWA.
• Lighthouse Audit: Use Chrome's Lighthouse tool to check your PWA's superpowers.

The future is progressive

Congratulations! You've just built your first PWA. It's like watching your child take their first steps, isn't it? (Speaking of bad jokes...)

As we move towards 2024, PWAs are becoming more powerful. They can access device features, work offline, and provide an app-like experience without the hassle of app stores.

So, the next time someone asks you if they can create a website or an app, you can say: “Why not both?” and introduce them to the wonderful world of PWAs!

Credits

Progressive Web Apps: The Future of Web Development, originally written by Baransel

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