I want to "emit" a message to a particular client which is selected based on another message received in a different client, How do I do this?
I am thinking of joining each client to their own "room" and then broadcast. Is there a better way?
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3 Answers
UPDATE for socket.io version 1.0 and above
io.to(socketid).emit('message', 'whatever');
For older version:
You can store each client in an object as a property. Then you can lookup the socket based on the message:
var basket = {};
io.sockets.on('connection', function (socket) {
socket.on("register", function(data) {
basket[data.nickname] = socket.id;
});
socket.on("privmessage", function(data){
var to = basket[data.to];
io.sockets.socket(to).emit(data.msg);
});
});
Not tested...but it should give you an idea
6 Comments
budsiya
How does it work with reddiss? I want to do the same thing but in a distributed load balanced environment.
Beast
for the version 1.0, we need to use io.to(socketId).emit('pm', {}); like @Minho Lee said
Daniel Que
@budsiya did you ever get it to work? I'm working on a similar problem, where I have multiple node processes running on a single server.
Steel Brain
@budsiya, you mean
redis ?
slevin
@Francesco This is very nice but you should expand the example, to help begginers grasp the concept. Or provide some links
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For socket.io version 1.0 use:
io.to(socketid).emit('message', 'whatever');
Comments
Emitting to a particular client using a socketID.
Server/ package: socket.io:
io.to(socketID).emit('testEvent', 'yourMessage');
Client/ package socket.io-client:
io.sockets.on('connection',(socket) => {
socket.on("testEvent", data => {
console.log(data);
});
});
You can get access the socketID in the following manner:
io.on('connection', (socket, next) => {
const ID = socket.id // id property on the socket Object
})
It is simply a property on the socket object
answered Aug 27, 2018 at 21:34
Willem van der Veen
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