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add new OptimisticMessages component
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export type Message = { id: number; message: string }; | ||
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export const messagesOnApi: Message[] = [ | ||
{ id: 1, message: "first" }, | ||
{ id: 2, message: "second" }, | ||
]; |
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Original file line number | Diff line number | Diff line change |
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import { | ||
useOptimistic, | ||
useState, | ||
MouseEvent, | ||
ChangeEvent, | ||
useTransition, | ||
useEffect, | ||
} from "react"; | ||
import { Message, messagesOnApi } from "./MessagesData"; | ||
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export function OptimisticMessages() { | ||
const [messagesRetrievedFromApi, setMessagesRetrievedFromApi] = useState< | ||
Message[] | ||
>([]); | ||
const [message, setMessage] = useState(""); | ||
const [optimisticMessages, addOptimisticMessage] = useOptimistic< | ||
Message[], | ||
string | ||
>(messagesRetrievedFromApi, (currentMessages, message) => { | ||
const finalMessages = [ | ||
...currentMessages, | ||
{ id: getNextId(currentMessages), message }, | ||
]; | ||
return finalMessages; | ||
}); | ||
const [_isPending, startTransition] = useTransition(); | ||
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useEffect(() => { | ||
const data = JSON.parse(JSON.stringify(messagesOnApi)); | ||
setMessagesRetrievedFromApi(data); | ||
}, []); | ||
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const addMessage = async (message: string) => { | ||
addOptimisticMessage(message); | ||
await new Promise((res) => | ||
setTimeout(() => { | ||
messagesOnApi.push({ | ||
id: getNextId(messagesOnApi), | ||
message, | ||
}); | ||
res(null); | ||
}, 2000) | ||
); | ||
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const data = JSON.parse(JSON.stringify(messagesOnApi)); | ||
setMessagesRetrievedFromApi(data); | ||
setMessage(""); | ||
}; | ||
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const onChange = (e: ChangeEvent<HTMLInputElement>) => { | ||
e.preventDefault(); | ||
setMessage(e.target.value); | ||
}; | ||
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const onClick = async (e: MouseEvent<HTMLButtonElement>) => { | ||
e.preventDefault(); | ||
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startTransition(() => { | ||
addMessage(message); | ||
}); | ||
}; | ||
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return ( | ||
<div> | ||
<input value={message} onChange={onChange} /> | ||
<button onClick={onClick}>add</button> | ||
<ul style={{ listStyleType: "none" }}> | ||
{optimisticMessages.map((m, i) => ( | ||
<li key={i}>{m.message}</li> | ||
))} | ||
</ul> | ||
</div> | ||
); | ||
} | ||
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function getNextId(currentMessages: Message[]) { | ||
let id = 0; | ||
for (let i = 0; i < currentMessages.length; i++) { | ||
if (currentMessages[i].id > id) id = currentMessages[i].id; | ||
} | ||
id += 1; | ||
return id; | ||
} |
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import { useFormStatus } from "react-dom"; | ||
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export default function SubmitButton() { | ||
const { pending } = useFormStatus(); | ||
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return ( | ||
<button type="submit" disabled={pending}> | ||
submit | ||
</button> | ||
); | ||
} |
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