| import React from 'react' |
|
|
| import { |
| QueryClient, |
| QueryClientProvider, |
| useMutation, |
| useQuery, |
| useQueryClient, |
| } from '@tanstack/react-query' |
| import { ReactQueryDevtools } from '@tanstack/react-query-devtools' |
|
|
| const queryClient = new QueryClient() |
|
|
| export default function App() { |
| return ( |
| <QueryClientProvider client={queryClient}> |
| <Example /> |
| </QueryClientProvider> |
| ) |
| } |
|
|
| function Example() { |
| const queryClient = useQueryClient() |
| const [intervalMs, setIntervalMs] = React.useState(1000) |
| const [value, setValue] = React.useState('') |
|
|
| const { status, data, error, isFetching } = useQuery({ |
| queryKey: ['todos'], |
| queryFn: async (): Promise<Array<string>> => { |
| const response = await fetch('/api/data') |
| return await response.json() |
| }, |
| |
| refetchInterval: intervalMs, |
| }) |
|
|
| const addMutation = useMutation({ |
| mutationFn: (add: string) => fetch(`/api/data?add=${add}`), |
| onSuccess: () => queryClient.invalidateQueries({ queryKey: ['todos'] }), |
| }) |
|
|
| const clearMutation = useMutation({ |
| mutationFn: () => fetch(`/api/data?clear=1`), |
| onSuccess: () => queryClient.invalidateQueries({ queryKey: ['todos'] }), |
| }) |
|
|
| if (status === 'pending') return <h1>Loading...</h1> |
| if (status === 'error') return <span>Error: {error.message}</span> |
|
|
| return ( |
| <div> |
| <h1>Auto Refetch with stale-time set to {intervalMs}ms</h1> |
| <p> |
| This example is best experienced on your own machine, where you can open |
| multiple tabs to the same localhost server and see your changes |
| propagate between the two. |
| </p> |
| <label> |
| Query Interval speed (ms):{' '} |
| <input |
| value={intervalMs} |
| onChange={(ev) => setIntervalMs(Number(ev.target.value))} |
| type="number" |
| step="100" |
| />{' '} |
| <span |
| style={{ |
| display: 'inline-block', |
| marginLeft: '.5rem', |
| width: 10, |
| height: 10, |
| background: isFetching ? 'green' : 'transparent', |
| transition: !isFetching ? 'all .3s ease' : 'none', |
| borderRadius: '100%', |
| transform: 'scale(2)', |
| }} |
| /> |
| </label> |
| <h2>Todo List</h2> |
| <form |
| onSubmit={(event) => { |
| event.preventDefault() |
| addMutation.mutate(value, { |
| onSuccess: () => { |
| setValue('') |
| }, |
| }) |
| }} |
| > |
| <input |
| placeholder="enter something" |
| value={value} |
| onChange={(ev) => setValue(ev.target.value)} |
| /> |
| </form> |
| <ul> |
| {data.map((item) => ( |
| <li key={item}>{item}</li> |
| ))} |
| </ul> |
| <div> |
| <button |
| onClick={() => { |
| clearMutation.mutate() |
| }} |
| > |
| Clear All |
| </button> |
| </div> |
| <ReactQueryDevtools initialIsOpen /> |
| </div> |
| ) |
| } |
|
|
