Sending message to specific client with socket.io and empty message queue

Question

I´m going crazy with socket.io! Documentation is so bad it\'s simply not true.

I want to send a feedback to specific client over socket.io

My server side loo

Answer 1

I believe io.sockets.socket has been removed and has been a problem in Socket.IO (https://github.com/socketio/socket.io/issues/1618).

You can use io.sockets.connected[socket.id] and store the socket.id to reference with the user via username:

var usernames = {};
usernames[username] = socket.id;
// Sending the message
io.sockets.connected[usernames[username]].emit(...);

I don't see it anywhere on the documentation so I can see how this hasn't been answered. Also, if you don't have any reference via usernames, you can instead try:

users[socket.id] = socket.id;

to duplicate the key and value for easy access.

There is also possibly another way by using io.clients as described below, but I haven't used that method.

OTHER SOLUTION: Send message to specific client with socket.io and node.js

Answer 2

i tired with the latest version of node and socket.io below i am going to post complete code

  <ul id="messages"></ul>
<form action="">
  <input id="id1"  /><button>Send</button>
</form>
<script src="https://cdn.socket.io/socket.io-1.2.0.js"></script>
<script src="http://code.jquery.com/jquery-1.11.1.js"></script>
<script>

  var io = io.connect();
  $('form').submit(function(){
    io.emit('drumevent', $('#id1').val());
    $('#id1').val('');
    return false;
  });
  io.on('drumevent', function(msg){
  console.log(msg);



    $('#messages').append($('<li></li>').text(msg.message+'    quantity = '+msg.quantity));
  });
</script>

server side code

  var usernames = {};io.on('connection', function(socket){usernames["username"] = socket.id;
socket.on('drumevent', function(msg){     
var socketId = socket.id;io.to(socketId).emit('drumevent', data);

Answer 3

The correct way to do this in Socket.io 1.0+ is:

io.to(users_socket_id).emit('new', 'hello');

You can also substitute a room name for 'users_socket_id' to emit to a specific socket.io room.

Answer 4

2 things

1) You should really place your io.sockets.on(..) outside your app/update route to prevent adding multiple listeners for clients.

2) io.sockets.socket(id); should not be used, it should have been socket.emit('new', 'hello')

Answer 5

Have you tried using?

var socket = io.connect('http://localhost:80/');

Answer 6

In socket.io 1.0, this is how it would work. It may work for lower versions, but I cannot guarantee it.

socket.to(socket_id_here).emit('new', 'hello');

This works because socket.io automatically adds a socket to a room with the socket's id on connection.

Also, if you plan to upgrade to version 1.0, there are a lot of changes to the api, so you'll sometimes have to change some code to make it work in 1.0.