javascript - Using rooms with socket.io -

in socket.io documentation see example of rooms

io.on('connection', function(socket){   socket.on('say someone', function(id, msg){     socket.broadcast.to(id).emit('my message', msg);   }); }); 

i have route /rooms/:roomid.

is possible make sockets being sent between server , client hits specific room?

i guess server should like

io.on('connection', function(socket){   socket.on('new msg client', function(roomid, msg){     io.to(id).emit('new msg server', msg);   }); }); 

above , client should send messages with

socket.emit('new msg client', roomid, msg); 

and new messages with

socket.on('new msg server', function () {   document.getelementbyid('msgs').appendchild(...); }); 

but work? shouldn't join room socket.join(...) before can this?

for haiku sharing application made have this:

io.on('connection', function(socket) {     var socket_id = socket.id;     var client_ip = socket.handshake.headers['x-forwarded-for'] || socket.handshake.address.address;     clients.push(socket);     console.info('new client connected (id=' + socket.id + ').');      number_of_clients_connected++;     console.log('[' + client_ip + '] connected, ' + number_of_clients_connected + ' total users online.');      //when socket disconnected or closed, .on('disconnect') fired     socket.on('disconnect', function() {         number_of_clients_connected--;         console.log('[' + client_ip + '] disconnected, ' + number_of_clients_connected + ' total users online.');         //on disconnect, remove clients array         var index = clients.indexof(socket);         if (index != -1) {             clients.splice(index, 1);             //console.info('client gone (id=' + socket.id + ').');         }     }); 

so keeps array of clients , when messages need relaying can specify client socket id...

//reads latest_haikus_cache , sends them socket.on('request_haiku_cache', function() {     latest_haikus_cache.foreach(function(a_latest_haiku) {         clients[clients.indexof(socket)].emit('load_haiku_from_cache', a_latest_haiku);     }); });