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function App() {
const [nickname, setNickname] = useState("");
const [email, setEmail] = useState("");
const [joined, setJoined] = useState(false);
const [msg, setMsg] = useState("");
const [messages, setMessages] = useState({});
const chatRoom = db.ref().child('chatrooms').child('global');
useEffect(() => {
const handleNewMessages = snap => {
if (snap.val()) setMessages(snap.val());
}
chatRoom.on('value', handleNewMessages);
return () => {
chatRoom.off('value', handleNewMessages);
};
});
const handleNameChange = e => setNickname(e.target.value);
const handleEmailChange = e => setEmail(e.target.value);
const handleClick = e => {
db.ref().child('nicknames').push({
nickname,
email,
});
setJoined(true);
};
const handleMsgChange = e => setMsg(e.target.value);
const handleKeyDown = e => {
if (e.key === "Enter") {
chatRoom.push({
sender: nickname,
msg,
});
setMsg("");
}
};
return (
<div className="App">
{!joined ? (
<div className="joinForm">
<input placeholder="Nickname" value={nickname} onChange={handleNameChange} /><br />
<input placeholder="Email" value={email} onChange={handleEmailChange} /><br />
<button onClick={handleClick}>Join</button>
</div>
) : (
<div className="chat">
<div className="messages">
{Object.keys(messages).map(message => {
if (messages[message]["sender"] === nickname)
return (
<div className="message">
<span id="me">{messages[message]["sender"]} :</span><br />
{messages[message]["msg"]}
</div>
);
else
return (
<div className="message">
<span id="sender">{messages[message]["sender"]} :</span><br />
{messages[message]["msg"]}
</div>
);
})}
</div>
<input placeholder="msg" onChange={handleMsgChange} onKeyDown={handleKeyDown} value={msg} /><br />
</div>
)}
</div>
);
}
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