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socket.io tips

chifarol answered on October 8, 2022 Popularity 1/10 Helpfulness 1/10

answer socket.io tips

socket.io tips

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// official doc
io.on("connection", (socket) => {

  // basic emit
  socket.emit(/* ... */);

  // to all clients in the current namespace except the sender
  socket.broadcast.emit(/* ... */);

  // to all clients in room1 except the sender
  socket.to("room1").emit(/* ... */);

  // to all clients in room1 and/or room2 except the sender
  socket.to(["room1", "room2"]).emit(/* ... */);

  // to all clients in room1
  io.in("room1").emit(/* ... */);

  // to all clients in room1 and/or room2 except those in room3
  io.to(["room1", "room2"]).except("room3").emit(/* ... */);

  // to all clients in namespace "myNamespace"
  io.of("myNamespace").emit(/* ... */);

  // to all clients in room1 in namespace "myNamespace"
  io.of("myNamespace").to("room1").emit(/* ... */);

  // to individual socketid (private message)
  io.to(socketId).emit(/* ... */);

  // to all clients on this node (when using multiple nodes)
  io.local.emit(/* ... */);

  // to all connected clients
  io.emit(/* ... */);

  // 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.

  // with acknowledgement
  socket.emit("question", (answer) => {
    // ...
  });

  // without compression
  socket.compress(false).emit(/* ... */);

  // a message that might be dropped if the low-level transport is not writable
  socket.volatile.emit(/* ... */);

  // with timeout
  socket.timeout(5000).emit("my-event", (err) => {
    if (err) {
      // the other side did not acknowledge the event in the given delay
    }
  });
});

// Add socket to room
socket.join('some room');

// Remove socket from room
socket.leave('some room');

// Send to current client
socket.emit('message', 'this is a test');

// Send to all clients include sender
io.sockets.emit('message', 'this is a test');

// Send to all clients except sender
socket.broadcast.emit('message', 'this is a test');

// Send to all clients in 'game' room(channel) except sender
socket.broadcast.to('game').emit('message', 'this is a test');

// Send to all clients in 'game' room(channel) include sender
io.sockets.in('game').emit('message', 'this is a test');

// Send to individual socket id
io.sockets.socket(socketId).emit('message', 'this is a test');

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Contributed on Oct 08 2022

chifarol

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