CODEWITHSUNDEEP
node.jssocketssocket.io
TRomesh
TRomesh

Reputation: 4481

Socketio sending to individual socketid (private message)

I've been trying to implement a chat service using socketio. I need to set a message to a selected socket id. The documentation says to use a function like socket.to(<socketid>).emit('hey', 'I just met you'); But it doesnt seem to be working. few moths ago i achieved this functionality by a function like io.sockets.connected[<socketid>].emit('hey', 'I just met you'); but now it doesnt seem to work any more. Btw the socket.broadcast.emit(); works pretty well. How to resolve this issue?

Upvotes: 1

Views: 1612

Answers (3)

LeulAria
LeulAria

Reputation: 615

here comprehensive doc where you can send using socket.io

  // 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');

Upvotes: 1

TRomesh
TRomesh

Reputation: 4481

Manage to send private message by the following code.

io.on("connection", function(socket) {
  socket.on("online", data => {
    socket.name = data.username;
    onlineUsers.push(data);
    sockets[data.username] = socket.id;
  });
  socket.on("message", function(data) {
    socket.broadcast.emit("public", data);
  });

  socket.on("send_personal_message", function(data) {
    socket.to(sockets[data.user]).emit("personal", data);
  });

  socket.on("disconnect", reason => {
    sockets.splice(sockets.findIndex(id => id === socket.id), 1);
  });
});

Upvotes: 2

zoecarver
zoecarver

Reputation: 6403

You can use socket.broadcast.to(<socketid>) to broadcast to specific socket id.

Here is an example:

socket.join('my-unique-room-name');
socket.broadcast.to('my-unique-room-name').emit('welcome', 'helloWorld'); //only people in 'my-unique-room-name' will receive this message

Hope this helps!

Upvotes: 1

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