getting how many people are in a chat room in socket.io [duplicate]

Question

I have this code right now that sets the nick and room:

io.sockets.on('connection', function(client){     var Room = "";     client.on("setNickAndRoom", function(nick, fn){         client.join(nick.room);         Room = nick.room;         client.broadcast.to(Room).emit('count', "Connected:" + " " + count);         fn({msg :"Connected:" + " " + count});     }); 

I wanted to know how I could get how many people are connected to a specific chatroom...like Room.length

client side :

function Chat(){     this.socket = null;     this.Nickname = "";     this.Room = "";     var synched = $('#syncUp');     this.Connect = function(nick, room){          socket =  io.connect('http://vybeing.com:8080');             Nickname = nick;         Room = room;         //conectarse         socket.on('connect',function (data) {             socket.emit('setNickAndRoom', {nick: nick, room: room}, function(response){                 $("#connection").html("<p>" + response.msg + "</p>");             });         }); } 

I found this, but it gives undefined:

count = io.rooms[Room].length; 

Answer 1

For socket.io versions >= 1.0:

Note that rooms became actual types with a .length property in 1.4, so the 1.4.x method should be stable from now on. Barring breaking changes to that type's API, of course.

To count all clients connected to 'my_room':

1.4+:

var room = io.sockets.adapter.rooms['my_room']; room.length; 

1.3.x:

var room = io.sockets.adapter.rooms['my_room']; Object.keys(room).length; 

1.0.x to 1.2.x:

var room = io.adapter.rooms['my_room']; Object.keys(room).length; 

This is assuming you're running with the default room adapter on a single node (as opposed to a cluster). Things are more complicated if you're in a cluster.

---

Other related examples:

• Count all clients connected to server:

  var srvSockets = io.sockets.sockets; Object.keys(srvSockets).length; 

• Count all clients connected to namespace '/chat':

  var nspSockets = io.of('/chat').sockets; Object.keys(nspSockets).length 

Answer 2

If you're using version < 1,

var clients = io.sockets.clients(nick.room); // all users from room