Medium
How to Implement Auto-Scrolling in React Real-Time Chat Message List
In a real-time chat application, you need to implement a message list that efficiently handles new messages and scrolling. What's missing in this implementation?
1function MessageList({ messages, currentUser }) {2 const listRef = useRef(null);3 const [autoScroll, setAutoScroll] = useState(true);45 // Missing implementation6 _______________78 const handleScroll = () => {9 if (!listRef.current) return;1011 const { scrollHeight, scrollTop, clientHeight } = listRef.current;12 const atBottom = scrollHeight - scrollTop - clientHeight < 30;13 setAutoScroll(atBottom);14 };1516 return (17 <div18 ref={listRef}19 className="message-list"20 onScroll={handleScroll}21 >22 {messages.map(message => (23 <div24 key={message.id}25 className={`message ${26 message.userId === currentUser.id ? 'sent' : 'received'27 }`}28 >29 <div className="content">{message.text}</div>30 <div className="time">31 {new Date(message.timestamp).toLocaleTimeString()}32 </div>33 </div>34 ))}35 </div>36 );37}