如何在Socket.IO中向特定名称空间的客户端广播消息？

Question

Here is a sample from socket.io website:

var io = require('socket.io').listen(80);

var chat = io
  .of('/chat')
  .on('connection', function (socket) {
    socket.emit('a message', {
        that: 'only'
      , '/chat': 'will get'
    });
    chat.emit('a message', {
        everyone: 'in'
      , '/chat': 'will get'
    });
  });

var news = io
  .of('/news')
  .on('connection', function (socket) {
    socket.emit('item', { news: 'item' });
  });

normally I use io.sockets.emit(...) to broadcast data to the clients. But how to broadcast messages to clients connected with namespace? In other words how to send message to all clients subscribed to news, and not to those who subscribed to chat?

UPDATE: I guess I know the answer:

news.sockets.emit(...);

am I correct?

Answer 1

From an official example on github :

var io = require('socket.io').listen(80);

io.sockets.on('connection', function (socket) {
  socket.join('justin bieber fans');
  socket.broadcast.to('justin bieber fans').emit('new fan');
  io.sockets.in('rammstein fans').emit('new non-fan');
});

So if you want to send a message to all the connected clients in a namespace you can use io.sockets.in('namespace').emit('message') .

Answer 2

You can try to use the following:

io.of('/news').emit('data', data);

In my case it works(version "socket.io":"^1.0.0-pre2" ).