关于queryFn,我们常用的可以是浏览器内置的fetchAPI,也可以是比较流行的 API fetching library,譬如 axios,只要返回的是一个 Promise 即可: // Refined `fetch` APIuseQuery(['todos',todoId],async()=>{constresponse=awaitfetch('/todos/'+todoId);// Throw error if status code is not 2xxif(!response...
无论是第一次获取还是重新获取，只要发生任何获取，该值都将是true。您也可以使用isRefetching只检查是否...
constqueryClient =newQueryClient({queryCache:newQueryCache({onError: queryCacheOnError, }), });functionqueryCacheOnError(err: unknown, query: Query){switch(query.meta?.errCode) {caseTErrCodes.POSTS_FETCH_FAILED:returntoast.error("Could not fetch posts");default:returntoast.error("Something went...
If set tofalse, the query will not refetch on mount. If set to"always", the query will always refetch on mount. If set to a function, the function will be executed with the query to compute the value refetchOnWindowFocus: boolean | "always" | ((query: Query) => boolean | "alwa...
The first thing we’re going to do is pass a unique key to the useQuery hook, which we’re going to calljoke. As a second argument, we’re going to pass the promise-based function for fetching our data and this is where we’re going to use Axios. We’re going to create a simpl...
and so we can use this cached data in other components as well. We can see in the code above as well, that we getisFetchingflag to determine if a background fetch is in process or not. Additionally,useQueryalso returns a functionrefresh()which we can use to re-fetch based on user ev...
useQuery是react-query最常用的hook,没有之一。通过源码可以发现,useQuery hook只负责解析参数,剩余的工作都交给useBaseQuery hook。 const parsedOptions = parseQueryArgs(arg1, arg2, arg3) return useBaseQuery(parsedOptions, QueryObserver) 接下来,将浅浅地解读useBaseQuery的实现原理。 函数签名 interface UseBaseQ...
Basic QueryFetching data using React Query is quite simple. All you need to do is define a fetch function and then pass it as a parameter to the useQuery mutation. You can see an example of views/BasicQuery.jsx page below:import React from "react"; import { useQuery } from "react-...
The query will not automatically fetch on mount. The query will not automatically refetch in the background. The query will ignore query clientinvalidateQueriesandrefetchQueriescalls that would normally result in the query refetching. refetchreturned fromuseQuerycan be used to manually trigger the ...
For example: one button that does queryClient.fetchQuery, and somewhere else a component that does useIsFetching(); the count should change when you click the button. Make sure the useIsFetching component is in a different part if the component tree that would not rerender top-down when ...