| |
| import { |
| QueryClient, |
| QueryClientProvider, |
| useQuery, |
| } from '@tanstack/solid-query' |
| import { SolidQueryDevtools } from '@tanstack/solid-query-devtools' |
| import { For, Match, Switch, createSignal } from 'solid-js' |
| import { render } from 'solid-js/web' |
| import { gql, request } from 'graphql-request' |
| import type { Accessor, Setter } from 'solid-js' |
|
|
| const endpoint = 'https://graphqlzero.almansi.me/api' |
|
|
| const queryClient = new QueryClient() |
|
|
| type Post = { |
| id: number |
| title: string |
| body: string |
| } |
|
|
| function App() { |
| const [postId, setPostId] = createSignal(-1) |
|
|
| return ( |
| <QueryClientProvider client={queryClient}> |
| <SolidQueryDevtools /> |
| <p> |
| As you visit the posts below, you will notice them in a loading state |
| the first time you load them. However, after you return to this list and |
| click on any posts you have already visited again, you will see them |
| load instantly and background refresh right before your eyes!{' '} |
| <strong> |
| (You may need to throttle your network speed to simulate longer |
| loading sequences) |
| </strong> |
| </p> |
| {postId() > -1 ? ( |
| <Post postId={postId()} setPostId={setPostId} /> |
| ) : ( |
| <Posts setPostId={setPostId} /> |
| )} |
| </QueryClientProvider> |
| ) |
| } |
|
|
| function createPosts() { |
| return useQuery(() => ({ |
| queryKey: ['posts'], |
| queryFn: async () => { |
| const { |
| posts: { data }, |
| } = await request<{ posts: { data: Array<Post> } }>( |
| endpoint, |
| gql` |
| query { |
| posts { |
| data { |
| id |
| title |
| } |
| } |
| } |
| `, |
| ) |
| return data |
| }, |
| })) |
| } |
|
|
| function Posts(props: { setPostId: Setter<number> }) { |
| const state = createPosts() |
|
|
| return ( |
| <div> |
| <h1>Posts</h1> |
| <div> |
| <Switch> |
| <Match when={state.status === 'pending'}>Loading...</Match> |
| <Match when={state.status === 'error'}> |
| <span>Error: {(state.error as Error).message}</span> |
| </Match> |
| <Match when={state.data !== undefined}> |
| <> |
| <div> |
| <For each={state.data}> |
| {(post: any) => ( |
| <p> |
| <a |
| onClick={() => props.setPostId(post.id)} |
| href="#" |
| style={ |
| // We can find the existing query data here to show bold links for |
| // ones that are cached |
| queryClient.getQueryData(['post', post.id]) |
| ? { |
| 'font-weight': 'bold', |
| color: 'green', |
| } |
| : {} |
| } |
| > |
| {post.title} |
| </a> |
| </p> |
| )} |
| </For> |
| </div> |
| <div>{state.isFetching ? 'Background Updating...' : ' '}</div> |
| </> |
| </Match> |
| </Switch> |
| </div> |
| </div> |
| ) |
| } |
|
|
| function createPost(postId: Accessor<number>) { |
| return useQuery(() => ({ |
| queryKey: ['post', postId()], |
| queryFn: async () => { |
| const { post } = await request<{ post: Post }>( |
| endpoint, |
| gql` |
| query { |
| post(id: ${postId()}) { |
| id |
| title |
| body |
| } |
| } |
| `, |
| ) |
|
|
| return post |
| }, |
| enabled: !!postId(), |
| })) |
| } |
|
|
| function Post(props: { postId: number; setPostId: Setter<number> }) { |
| const state = createPost(() => props.postId) |
|
|
| return ( |
| <div> |
| <div> |
| <a onClick={() => props.setPostId(-1)} href="#"> |
| Back |
| </a> |
| </div> |
| <Switch> |
| <Match when={!props.postId || state.status === 'pending'}> |
| Loading... |
| </Match> |
| <Match when={state.status === 'error'}> |
| <span>Error: {(state.error as Error).message}</span> |
| </Match> |
| <Match when={state.data !== undefined}> |
| <> |
| <h1>{state.data?.title}</h1> |
| <div> |
| <p>{state.data?.body}</p> |
| </div> |
| <div>{state.isFetching ? 'Background Updating...' : ' '}</div> |
| </> |
| </Match> |
| </Switch> |
| </div> |
| ) |
| } |
|
|
| render(() => <App />, document.getElementById('root') as HTMLElement) |
|
|
