快速開始

import {
  useQuery,
  useMutation,
  useQueryClient,
  QueryClient,
  QueryClientProvider,
} from '@tanstack/react-query'
import { getTodos, postTodo } from '../my-api'

// 建立 client
const queryClient = new QueryClient()

function App() {
  return (
    // 將 client 提供給您的 App
    <QueryClientProvider client={queryClient}>
      <Todos />
    </QueryClientProvider>
  )
}

function Todos() {
  // 存取 client
  const queryClient = useQueryClient()

  // 查詢
  const query = useQuery({ queryKey: ['todos'], queryFn: getTodos })

  // 變更
  const mutation = useMutation({
    mutationFn: postTodo,
    onSuccess: () => {
      // 使查詢失效並重新取得資料
      queryClient.invalidateQueries({ queryKey: ['todos'] })
    },
  })

  return (
    <div>
      <ul>{query.data?.map((todo) => <li key={todo.id}>{todo.title}</li>)}</ul>

      <button
        onClick={() => {
          mutation.mutate({
            id: Date.now(),
            title: 'Do Laundry',
          })
        }}
      >
        新增待辦事項
      </button>
    </div>
  )
}

render(<App />, document.getElementById('root'))

import {
  useQuery,
  useMutation,
  useQueryClient,
  QueryClient,
  QueryClientProvider,
} from '@tanstack/react-query'
import { getTodos, postTodo } from '../my-api'

// 建立 client
const queryClient = new QueryClient()

function App() {
  return (
    // 將 client 提供給您的 App
    <QueryClientProvider client={queryClient}>
      <Todos />
    </QueryClientProvider>
  )
}

function Todos() {
  // 存取 client
  const queryClient = useQueryClient()

  // 查詢
  const query = useQuery({ queryKey: ['todos'], queryFn: getTodos })

  // 變更
  const mutation = useMutation({
    mutationFn: postTodo,
    onSuccess: () => {
      // 使查詢失效並重新取得資料
      queryClient.invalidateQueries({ queryKey: ['todos'] })
    },
  })

  return (
    <div>
      <ul>{query.data?.map((todo) => <li key={todo.id}>{todo.title}</li>)}</ul>

      <button
        onClick={() => {
          mutation.mutate({
            id: Date.now(),
            title: 'Do Laundry',
          })
        }}
      >
        新增待辦事項
      </button>
    </div>
  )
}

render(<App />, document.getElementById('root'))