将消息发送到node.js和socket.io中的单个套接字

Question

How would one send a message out to a single socket using socket.io.

I was thinking something like this but it doesn't work.

io.sockets.socket(socket.id).emit('messagetype', "message")

I get this error:

TypeError: Property 'connected' of object #<Namespace> is not a function

I think I'm just having an issue with syntax but can't find a source about it.

Answer 1

Basically this is what you need.

io.on('connection', function(socket){
  socket.emit('messagetype', "message");
});

It's well documented at socketio-docs

Answer 2

in your code you are usind to feth other persons socket but (socket.id) will always return your own socket id so you have to save others socket id in your database or in any array then you can send them any message:

   io.sockets.socket(socket_array['socketid']).emit('','');

here socket_array is an array where you have to save others socket id and 'socketid' is the key to feth the socketid;you can use username of others in stead of 'socketid', then it would be an unique id.