Flutterexperts

In this article, we will explore Flutter: Socket.IO WebSockets Client. We will learn how to execute a demo program. We will show you how to use Socket.IO Client with the socket_io_client package in your Flutter applications.

For Socket IO Client:

socket_io_client | Dart package
Dartlang port of socket. io-client for web, flutter, dartvm to usepub.dev

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Table Of Contents:

What is Socket.IO

How Socket.IO Works

Implementation

Code Implement

Conclusion

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What is Socket.IO:

By allowing real-time connection between clients and servers, the Flutter library Socket.IO allows us to enable or superpower Flutter apps. WebSocket Technology is ideal for developing applications such as online gaming, real-time chat, and more.

How Socket.IO Works:

We set up a real-time, bidirectional data transfer between the client application (Flutter) and the backend server, which will function as a WebSockets server.

Actions to take:

• Create a connection between the server and the client.
• Any event or message that comes in from the server will be heard by the Flutter app.
• Data will be broadcast to the backend by Emet Events.
• Always cut off the client-server connection when it is no longer required.

Implementation:

Step 1: Add the dependencies

Add dependencies to pubspec . yaml file.

dependencies:
  flutter:
    sdk: flutter
  socket_io_client: ^latest version

Step 2: Import

import 'package:socket_io_client/socket_io_client.dart' as IO;

Step 3: Run flutter packages get in the root directory of your app.

How to implement code in dart file:

=> Initialize SocketIO in Flutter:-

• onConnect: A callback is initiated when a WebSocket connects.
• onDisconnect: The onDisconnect method allows us to continuously check for socket disconnections caused by certain sockets.

IO.Socket socket = IO.io('http://localhost:3000',
  OptionBuilder()
      .setTransports(['websocket']) 
      .setExtraHeaders({'foo': 'bar'})
      .build());


socket.connect();

socket.onConnect((_) => print(" Connected to Server "));

socket.onConnectError(() => print('Connection Error: $err'));

socket.onError((err)=> print("Error"));

socket.onDisconnect((_)=> print('Disconnected from Server"));

• onConnectError: is utilised for handling; a callback will be initiated if an error occurs during socket connection.
• onError: This can be used to address any errors that may arise during the client-server message exchange.

=> Listening to WebSocket Events:-
We utilise the On method to listen to any incoming messages related to a certain event topic. Flutter apps can utilise On Method to listen to incoming messages, such as showing new chat messages in real time.

void listenToSocketEvent(){

socket.on('eventName' (data){
   print(' Message received: $data');
});

}

=> Sending or Emitting Events to Listeners:-

The emit method is used when we wish to broadcast an event to all listeners or send a message or data to a server. We can instantly send data or messages from client to server by using emit.

void sendData(){

  final messageData = {

   'messageId':'abcd12',
   'text':'Hello, This is First Message', 
   'sender':'userName',
   'isImportant':true,
   'timestamp':DataTime.now().toIso8601String(),
  }

}

=> Closing WebSockets:-

Never forget to disconnect the socket while not in use. This is usually possible while the application is closed.

void closeAllSocketConnection(){

   socket.disconnect();
   socket.dispose();

}

Conclusion:

In the article, I have explained the Clutter: Socket.IO WebSockets Client; you can modify this code according to your choice. This was a small introduction to the Flutter: Socket.IO WebSockets Client User Interaction from my side, and it’s working using Flutter.

I hope this blog will provide you with sufficient information on Trying the Flutter: Socket.IO WebSockets Client in your Flutter projects. We will show you what the Introduction is. Make a demo program for working on the Socket.IO WebSockets Client using the socket_io_client package in your Flutter applications. So please try it.

❤ ❤ Thanks for reading this article ❤❤

If I need to correct something? Let me know in the comments. I would love to improve.

Clap 👏 If this article helps you.

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