useOptimistic untuk Umpan Balik Seketika

Selamat Datang

Apa Itu UI Optimistis?

Dasar-Dasar useOptimistic

'use client';
import { useOptimistic } from 'react';

const [optimisticLikes, addOptimisticLike] = useOptimistic(
  likes,                      // actual state from server
  (state, newLike) => [...state, newLike] // how to apply optimistic update
);

Contoh Tombol Like

async function handleLike() {
  addOptimisticLike({ id: Date.now(), user: currentUser });
  await likePost(postId); // server action
}

Tempat State Optimistis Disimpan

Indikator Menunggu pada Item Optimistis

const [optimisticMessages, addOptimistic] = useOptimistic(
  messages,
  (state, msg) => [...state, { ...msg, pending: true }]
);

// Render
{optimisticMessages.map(m => (
  <div key={m.id} style={{ opacity: m.pending ? 0.6 : 1 }}>{m.text}</div>
))}

Menggunakan useOptimistic di Dalam Transisi

'use client';
import { startTransition } from 'react';

const handleSubmit = (data) => {
  startTransition(async () => {
    addOptimistic(data);
    await serverAction(data);
  });
};

Contoh Pengiriman Pesan Obrolan

Perilaku Pengembalian Saat Error

useOptimistic vs Pembaruan Optimistis Manual

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Ringkasan

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