In the <script> section of the file, on line (2), we create an instance of the io() class from the socket.io JavaScript library and assign it to the socket variable:
var socket = io(); // (2)
socket.on('connect', function() { // (3)
console.log("Connected to Server");
$("#connected").html("Yes");
});
socket.on('disconnect', function() { // (4)
console.log("Disconnected from the Server");
$("#connected").html("No");
});
On line (3), with socket.on('connect', ...), we register a connect event listener. This handler is called every time our web page client connects successfully to our Python server. This is the client-side equivalent of the Python server's on connect handler we defined with @socketio.on('connect').
On...
