I'm doing my first app with socket.io and I want to send a message to any user. I know broadcast function, but I want to send a message to ANYONE. I've seeked and there's a way: using io.sockets.emit, but I don't know where I have to write that code because I'm using express on node.js and I receive in my function a socket (the current user).
Thank you.
Here is a example of chatting. full codes are https://github.com/bwcho75/node.js_study/tree/master/node_chatting
Hope it to helpful to u. P.S. it uses room. So if u want to send message to all user. Change io.sockets.in(room).emit to io.sockets.emit
var express = require('express');
var routes = require('./routes');
var http = require('http');
var path = require('path');
var app = express();
app.use(express.bodyParser());
app.use(express.cookieParser('your secret here'));
app.use(express.session());
app.use(express.static(path.join(__dirname, 'public')));
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');
app.use(express.favicon());
app.use(express.logger('dev'));
app.use(express.json());
app.use(express.urlencoded());
app.use(express.methodOverride());
app.use(app.router);
var httpServer =http.createServer(app).listen(3000, function(req,res){
console.log('Socket IO server has been started');
});
// upgrade http server to socket.io server
var io = require('socket.io').listen(httpServer);
var count = 0;
var rooms = new Array() ;
app.get('/:room',function(req,res){
console.log('room name is :'+req.params.room);
res.render('index',{room:req.params.room});
});
io.sockets.on('connection',function(socket){
socket.on('joinroom',function(data){
socket.join(data.room);
socket.set('room', data.room,function() {
var room = data.room;
var nickname = '손님-'+count;
socket.emit('new', {nickname: nickname});
// Create Room
if(rooms[room] == undefined ){
console.log('room create :'+room);
rooms[room] = new Object();
rooms[room].nicknames = new Object();
rooms[room].socket_ids = new Object();
}
// Store current user's nickname and socket.id to MAP
rooms[room].socket_ids[nickname] = socket.id
rooms[room].nicknames[socket.id] = nickname;
// broad cast join message
data = {msg : nickname +' 님이 입장하셨습니다.'};
io.sockets.in(room).emit('broadcast_msg',data);
// broadcast changed user list in the room
io.sockets.in(room).emit('userlist',{users:Object.keys(rooms[room].socket_ids)});
count++;
});
});
socket.on('changename',function(data){
socket.get('room',function(err,room){
var nickname = data.nickname;
// if user changes name get previous nickname from nicknames MAP
var previous_nickname = rooms[room].nicknames[socket.id];
if(previous_nickname != undefined){
delete rooms[room].socket_ids[previous_nickname];
}
rooms[room].socket_ids[nickname] = socket.id
rooms[room].nicknames[socket.id] = nickname;
data = {msg : previous_nickname +' 님이 '+nickname+'으로 대화명을 변경하셨습니다.'};
io.sockets.in(room).emit('broadcast_msg', data);
// send changed user nickname lists to clients
io.sockets.in(room).emit('userlist',{users:Object.keys(rooms[room].socket_ids)});
});
});
Sure: simply,
keep your socket connections in your app.js or server.js file.
simply follow the code:
var http = require('http').Server(app);
var io = require('socket.io')(http);
now start the connection like:
io.on('connection', function(socket){
console.log("A user connected");
}):
whenever you run the server file, "a user connected" will be printed. means, one client has connected to the server.
to disconnect to the server: io.on('connection', function(socket){ console.log("A user connected");
socket.on('disconnect',function(){
console.log("a user disconnected");
});
}):
now you are ready to send a message to all who are connected to the server:
socket.on('chat message', function(data){
socket.emit('chat message', msg);
});
If you want send a message to all exclude sender:
socket.on('chat message', function(data){
io.broadcast.emit('chat message', msg);
});
For more reference: Send response to all clients except sender (Socket.io)
I hope u got an idea on it.!! Good luck
