websockets-index-v1.js

        /**
         * Once the website loads, we want to apply listeners and connect to websocket
         * */
        window.onload = function () {
            // Apply our listener functions to the submit event on both forms
            // we do it this way to avoid redirects
            document.getElementById("chatroom-selection").onsubmit = changeChatRoom;
            document.getElementById("chatroom-message").onsubmit = sendMessage;

            // Check if the browser supports WebSocket
            if (window["WebSocket"]) {
                console.log("supports websockets");
                // Connect to websocket
                conn = new WebSocket("ws://" + document.location.host + "/ws");
            
                // Add a listener to the onmessage event
                conn.onmessage = function(evt) {
                    console.log(evt);
                }
            
            } else {
                alert("Not supporting websockets");
            }
        };