Get a list of current clients with usernames

Question

I am making a simple chat, so when someone logs on I have this:

socket.broadcast.emit('logon', { socketID: socket.id, username: username });

So if I login via chrome as "Bob", and then I log in via Edge as "Ted", I will see "Ted" when "Ted" logs in and I am looking at the chat with chrome.

But how do I get the list of current clients with usernames as soon as I log in?

So if "Ted" is already there, and I log in as "Bob" from a different browser, I want to see "Ted" in the list.

Is it possible to do without using a database to store each user that logs in, as that is the only way I can think of but would prefer not to use a database?

Andrew · Accepted Answer · 2017-12-22 06:07:39Z

There is no need to use a database. The only thing you must have is an array of users that is connected to certain event listeners server side. Example:

var users = []; // Array of users online io.on('connection', function(socket) { var user = { // On connection, create an object for the user. socket: socket, username: null } socket.on("login",function(data) { // When the user logs in, set his username and add him to the users array. user.username = data.username; users.push(user); }); socket.on("disconnect",function() { // When user disconnects, remove the object from the array. var index = users.indexOf(user); if (index !== -1) users.splice(index); }); });

As you can see, there is now an array of all online users that you can access.

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