websockets-index-v8.js

        /**
         * ChangeChatRoomEvent is used to switch chatroom
         * */
        class ChangeChatRoomEvent {
            constructor(name) {
                this.name = name;
            }
        }
        /**
         * changeChatRoom will update the value of selectedchat
         * and also notify the server that it changes chatroom
         * */
        function changeChatRoom() {
            // Change Header to reflect the Changed chatroom
            var newchat = document.getElementById("chatroom");
            if (newchat != null && newchat.value != selectedchat) {
                selectedchat = newchat.value;
                header = document.getElementById("chat-header").innerHTML = "Currently in chat: " + selectedchat;

                let changeEvent = new ChangeChatRoomEvent(selectedchat);
                sendEvent("change_room", changeEvent);
                textarea = document.getElementById("chatmessages");
                textarea.innerHTML = `You changed room into: ${selectedchat}`;
            }
            return false;
        }