Socket.io don't emit after disconnect event

Question

I want to send data from the server to the client after a disconnect socket.io event occurs.

Server :

const clients = {};
io.on('connection', socket => {
    clients[socket.id] = socket;
    console.log('connect : ' + socket.id);
    socket.emit('socket-connect', 'connected');

    socket.on('disconnect', () => {
        socket.emit('socket-disconnect', 'disconnected');
        delete clients[socket.id];
        console.log('disconnect : ' + socket.id);
    });
});

Client :

const  socket = openSocket('localhost');

socket.on('socket-connect', data => {
    console.log(data);
});

socket.on('socket-disconnect', data => {
    console.log(data);
});

If socket connected, the server send a connect message to client and it works, but it does not send interrupted messages to the client if the disconnection occurs.

console.log('disconnect : ' + socket.id); on server showing disconnect with the socket.id.

I'm using socket.io v2.0.4 both on server and client.

How can I send data from the server if a socket disconnect event occurs?

im_tsm im_tsm · Accepted Answer · 2018-11-29T13:30:39

Event: disconnect is fired upon disconnection. This simply means, for some reason, there is no connection between the client and the server. So in this situation, you cannot send data to the client as the client is not connected. Disconnection may happen if the client's network is not available(read Internet failure) or the client environment(ex: browser) crashed or the user closed the tab.

Socket.io don't emit after disconnect event

1 Answers