𝗕𝘂𝗶𝗹𝗱𝗶𝗻𝗴 𝗥𝗲𝗮𝗹-𝗧𝗶𝗺𝗲 𝗔𝗻𝗴𝘂𝗹𝗮𝗿 𝗗𝗮𝘀𝗵𝗯𝗼𝗮𝗿𝗱𝘀 𝘄𝗶𝘁𝗵 𝗪𝗲𝗯𝗦𝗼𝗰𝗸𝗲𝘁𝘀
Most dashboards feel stale. Users land on a page and wait. They hit refresh or deal with constant polling that slows down your server.
WebSockets change this. Instead of the client asking for data, the server pushes it. This is ideal for live metrics, user activity, or financial data.
Here is how to build a production-ready real-time dashboard using Angular, RxJS, and Signals.
The Architecture
- Use RxJS webSocket to manage the connection.
- Use shareReplay to let multiple components use one connection.
- Use Angular Signals for a single source of truth.
- Use a Store pattern to keep components simple.
The Service Layer Do not open a new connection for every component. Use the webSocket subject from rxjs/webSocket. Use shareReplay so your whole app shares one stream. This prevents your server from handling hundreds of unnecessary connections.
The Signal Store Avoid putting business logic in your components. Create a Store that subscribes to your service. This store holds your metrics and alerts in Signals. Your components then just read these signals. This makes your UI fast and easy to test.
Clean Components Your components should only do one thing: render data. If you use a Signal-based store, your component code stays tiny. It reads a value and shows it on the screen.
Key Pro Tips
- Connection Status: Always show a "Live" or "Reconnecting" indicator. Users need to know if their data is current.
- Error Handling: Use exponential backoff for reconnections. Do not hammer your server when it goes down.
- Data Management: Use .slice() on your alert arrays. This keeps your history useful without using too much memory.
WebSockets work best when you need two-way communication. If you only need to receive data, look into Server-Sent Events (SSE) as a simpler option.
Stop making your users hit the refresh button.
Source: https://dev.to/rigole/building-real-time-dashboards-in-angular-with-websockets-a-complete-guide-10he