socket io tutorial - Simple Way to Emit Messages By User Id - socket io android - socket io client

Simple Way To Emit Messages By User Id

var express = require('express');
var socketio = require('Socket io');

var app = express();
var server = http.createServer(app);
var io = socketio(server);

io.on('connect', function (socket) {
  socket.on('userConnected', socket.join);
  socket.on('userDisconnected', socket.leave);
});

function message (userId, event, data) {
  io.sockets.to(userId).emit(event, data);
}

Here the socket uses connect to check the connection and call join to subscribe the given channel
Every sockets contain an uniqueid if we want to send message to an unique id then call the userId
And then emit the message for any other process within the channel
And finally leave from the channel

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Hello world with socket message

On the client:

var socket = io('http://localhost:9000');  // Server endpoint

socket.on('connect', connectUser);

socket.on('message', function (data) {
  console.log(data);
});

function connectUser () {  // Called whenever a user signs in
  var userId = ...  // Retrieve userId
  if (!userId) return;
  socket.emit('userConnected', userId);
}

function disconnectUser () {  // Called whenever a user signs out
  var userId = ...  // Retrieve userId
  if (!userId) return;
  socket.emit('userDisconnected', userId);
}

The client emit the message to any channel randomly

Both method allows sending messages to specific users by unique id without holding a reference to all sockets on the server.

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socket io tutorial - Simple Way to Emit Messages By User Id - socket io android - socket io client

Simple Way To Emit Messages By User Id

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