Socket.io send disconnect event with parameter

Question

I want to send disconnect event manually with custom parameter to socket.io server. I use this function but won\'t work:

//client

var userId = 23;
so         


        

Answer 1

We can manage a global array at server side.

var sockets = [];
io.on('connection', function (socket) {
    const id = socket.id ;

    socket.on('user-join', function(data) {
         sockets[id] = res.id;
    });

    socket.on('disconnect', function(data) { 
        io.emit('user-unjoin', {user_id: sockets[id],status:'offline'}); 
    });
});

On clients side,

socket.on('user-unjoin', function (data) {
    // update status of data.user_id according to your need.
});

This answer is inspired from Jackthomson's answer.