socket emit to specific room using nodejs socket io

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Ellie
21 Aug 2017
1socket.emit('message', "this is a test"); //sending to sender-client only
2socket.broadcast.emit('message', "this is a test"); //sending to all clients except sender
3socket.broadcast.to('game').emit('message', 'nice game'); //sending to all clients in 'game' room(channel) except sender
4socket.to('game').emit('message', 'enjoy the game'); //sending to sender client, only if they are in 'game' room(channel)
5socket.broadcast.to(socketid).emit('message', 'for your eyes only'); //sending to individual socketid
6io.emit('message', "this is a test"); //sending to all clients, include sender
7io.in('game').emit('message', 'cool game'); //sending to all clients in 'game' room(channel), include sender
8io.of('myNamespace').emit('message', 'gg'); //sending to all clients in namespace 'myNamespace', include sender
9socket.emit(); //send to all connected clients
10socket.broadcast.emit(); //send to all connected clients except the one that sent the message
11socket.on(); //event listener, can be called on client to execute on server
12io.sockets.socket(); //for emiting to specific clients
13io.sockets.emit(); //send to all connected clients (same as socket.emit)
14io.sockets.on() ; //initial connection from a client.
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Sara
14 May 2019
1io.to('room1').to('room2').to('room3').emit('some event');
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Federica
15 Jan 2021
1io.on('connect', onConnect);function onConnect(socket){  // sending to the client  socket.emit('hello', 'can you hear me?', 1, 2, 'abc');  // sending to all clients except sender  socket.broadcast.emit('broadcast', 'hello friends!');  // sending to all clients in 'game' room except sender  socket.to('game').emit('nice game', "let's play a game");  // sending to all clients in 'game1' and/or in 'game2' room, except sender  socket.to('game1').to('game2').emit('nice game', "let's play a game (too)");  // sending to all clients in 'game' room, including sender  io.in('game').emit('big-announcement', 'the game will start soon');  // sending to all clients in namespace 'myNamespace', including sender  io.of('myNamespace').emit('bigger-announcement', 'the tournament will start soon');  // sending to a specific room in a specific namespace, including sender  io.of('myNamespace').to('room').emit('event', 'message');  // sending to individual socketid (private message)  io.to(socketId).emit('hey', 'I just met you');  // WARNING: `socket.to(socket.id).emit()` will NOT work, as it will send to everyone in the room  // named `socket.id` but the sender. Please use the classic `socket.emit()` instead.  // sending with acknowledgement  socket.emit('question', 'do you think so?', function (answer) {});  // sending without compression  socket.compress(false).emit('uncompressed', "that's rough");  // sending a message that might be dropped if the client is not ready to receive messages  socket.volatile.emit('maybe', 'do you really need it?');  // specifying whether the data to send has binary data  socket.binary(false).emit('what', 'I have no binaries!');  // sending to all clients on this node (when using multiple nodes)  io.local.emit('hi', 'my lovely babies');  // sending to all connected clients  io.emit('an event sent to all connected clients');};
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Arlo
06 Jun 2017
1io.on('connection', socket => {  socket.on('say to someone', (id, msg) => {    socket.to(id).emit('my message', msg);  });});
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Jethro
19 Oct 2020
1Let me make it simpler with socket.io rooms. request a server 
2with a unique identifier to join a server. here we are using 
3an email as a unique identifier.
4
5Client Socket.io
6socket.on('connect', function () {
7  socket.emit('join', {email: user@example.com});
8});
9When the user joined a server, create a room for that user
10
11Server Socket.io
12io.on('connection', function (socket) {
13   socket.on('join', function (data) {    
14    socket.join(data.email);
15  });
16});
17Now we are all set with joining. let emit something to from the 
18server to room, so that user can listen.
19
20Server Socket.io
21io.to('user@example.com').emit('message', {msg: 'hello world.'});
22
23Let finalize the topic with listening to message event to the 
24client side
25socket.on("message", function(data) {
26  alert(data.msg);
27});
28
29The reference from Socket.io rooms
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