App.tsx•1.85 kB
import { FormEvent, useState } from "react";
import { useMutation, useQuery } from "convex/react";
import { api } from "../convex/_generated/api";
import { ConvexError } from "convex/values";
import ErrorBoundary from "./ErrorBoundary";
export default function App() {
const [newMessageText, setNewMessageText] = useState("");
const sendMessage = useMutation(api.messages.sendMessage);
const [name] = useState(() => "User " + Math.floor(Math.random() * 10000));
async function handleSendMessage(event: FormEvent) {
event.preventDefault();
try {
if (newMessageText) {
await sendMessage({ body: newMessageText, author: name });
}
setNewMessageText("");
} catch (error) {
const errorMessage =
error instanceof ConvexError ? error.data : "Unexpected error occurred";
alert(errorMessage);
}
}
const clearMessages = useMutation(api.messages.clearMessages);
return (
<main>
<h1>Convex Chat</h1>
<p className="badge">
<span>{name}</span>
</p>
<ErrorBoundary clearMessages={clearMessages}>
<MessageList />
<form onSubmit={handleSendMessage}>
<input
value={newMessageText}
onChange={(event) => setNewMessageText(event.target.value)}
placeholder="Write a message…"
/>
<input type="submit" value="Send" disabled={!newMessageText} />
</form>
</ErrorBoundary>
</main>
);
}
export function MessageList() {
const messages = useQuery(api.messages.list) || [];
return (
<ul>
{messages.map((message) => (
<li key={message._id}>
<span>{message.author}:</span>
<span>{message.body}</span>
<span>{new Date(message._creationTime).toLocaleTimeString()}</span>
</li>
))}
</ul>
);
}