Angular
Leveraging WebSockets in Angular for Real-Time Data Updates
Introduction
Have you ever used a live chat app or seen real-time stock prices update instantly? That’s WebSockets at work! Unlike traditional APIs, where you constantly request updates, WebSockets keep a direct connection open—so updates arrive instantly without refreshing the page.
How Does It Work?
- A WebSocket connection is established → Think of it like opening a direct phone line between your app and the server.
- The server sends updates instantly → No need to ask for new data—it just arrives when something changes.
- Your Angular app updates in real time → Whether it's a new message, a stock price change, or live notifications, everything updates without delay.
- The connection stays open → Until you close it or the server disconnects, your app keeps listening for updates.
Example: Real-Time Chat Messages in Angular
Imagine you're building a chat app where new messages should appear instantly for all users.
- Set up a WebSocket connection to the server.
- Listen for new messages and update the UI as soon as they arrive.
- Send messages through the WebSocket instead of making separate HTTP requests.
In Angular, this can be done using RxJS's webSocket API, which allows us to subscribe to incoming messages and send new ones effortlessly.
const socket = webSocket('wss://chat-server.com'); // Listen for messagessocket.subscribe(message => console.log('New message:', message));// Send a messagesocket.next({ user: 'Alice', text: 'Hello everyone!' });Whenever a new message is sent, everyone connected to the WebSocket sees it instantly, without needing to refresh the page.
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