| --- |
| id: query-functions |
| title: Query Functions |
| ref: docs/framework/react/guides/query-functions.md |
| --- |
| |
| [//]: # 'Example' |
|
|
| ```ts |
| injectQuery(() => ({ queryKey: ['todos'], queryFn: fetchAllTodos })) |
| injectQuery(() => ({ queryKey: ['todos', todoId], queryFn: () => fetchTodoById(todoId) }) |
| injectQuery(() => ({ |
| queryKey: ['todos', todoId], |
| queryFn: async () => { |
| const data = await fetchTodoById(todoId) |
| return data |
| }, |
| })) |
| injectQuery(() => ({ |
| queryKey: ['todos', todoId], |
| queryFn: ({ queryKey }) => fetchTodoById(queryKey[1]), |
| })) |
| ``` |
|
|
| [//]: # 'Example' |
| [//]: # 'Example2' |
|
|
| ```ts |
| todos = injectQuery(() => ({ |
| queryKey: ['todos', todoId()], |
| queryFn: async () => { |
| if (somethingGoesWrong) { |
| throw new Error('Oh no!') |
| } |
| if (somethingElseGoesWrong) { |
| return Promise.reject(new Error('Oh no!')) |
| } |
| |
| return data |
| }, |
| })) |
| ``` |
|
|
| [//]: # 'Example2' |
| [//]: # 'Example3' |
|
|
| ```ts |
| todos = injectQuery(() => ({ |
| queryKey: ['todos', todoId()], |
| queryFn: async () => { |
| const response = await fetch('/todos/' + todoId) |
| if (!response.ok) { |
| throw new Error('Network response was not ok') |
| } |
| return response.json() |
| }, |
| })) |
| ``` |
|
|
| [//]: # 'Example3' |
| [//]: # 'Example4' |
|
|
| ```ts |
| result = injectQuery(() => ({ |
| queryKey: ['todos', { status: status(), page: page() }], |
| queryFn: fetchTodoList, |
| })) |
| |
| // Access the key, status and page variables in your query function! |
| function fetchTodoList({ queryKey }) { |
| const [_key, { status, page }] = queryKey |
| return new Promise() |
| } |
| ``` |
|
|
| [//]: # 'Example4' |
|
|
