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.
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');};
1io.on('connection', socket => { socket.on('say to someone', (id, msg) => { socket.to(id).emit('my message', msg); });});
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