所以你会在控制台日志中看到以下警告: Warning: An effect function must not return anything besides a function, which is used for clean-up. It looks like you wrote useEffect(async () => ...) or returned a Promise. Instead, write the async function inside your effect and call it immediately...
When you use useEffect, if you use async...await... in the callback function, the following error will be reported. Looking at the error report, we know that theeffect function should return a destroy function (effect: refers to the cleanup function returned by return). If the first para...
Not required. Array. Works as 2nd argument ofuseEffecthook. When one of items changed,AsyncPaginatecleans all cached options. loadOptionsOnMenuOpen Not required. Boolean. Iffalseoptions will not load on menu opening. mapOptionsForMenu Not required. Function. Post-mapping of loaded options to disp...
useEffect中的异步请求的工作方式与Async不同 由于以下原因,它无法工作: try{ const response = await axios.post( backendUrl + 'user' , requestData ) setUserAccountInfo(response?.data?.message) typeof userAccountInfo.userlogin !== 'undefined' && setUserLogin(userAccountInfo.userlogin) typeof user...
Promises and useEffect(async () => …) are not supported, but you can call an async function inside an effect 这就是为什么不能直接在useEffect中使用async函数, 因此,我们可以不直接调用async函数,而是像下面这样: function App() { const [data, setData] = useState({ hits: [] }); ...
The sectionNote on fetching data insideuseEffectwas added The initial explanation of why you couldn't declareuseEffect's callback as async was fixed (the initial version was incorrect) ThefetchDatacalls were added acatchfor errors. It's a bit more bloat but it's something that you absolutely...
Now the Hook is back to returning players data and the main useEffect() function is back to returning nothing. Instead, we've defined the fetchTopPlayers() inner function that we immediately call. We make fetchTopPlayers() an async function so that we can use await within it. I gotta ad...
You cannot directly make the callback function supplied to the useEffect hook async because: async functions implicitly return a promise, and; useEffect expects its callback to either return nothing or a clean-up function.When you attempt to make useEffect's callback async, you will see the ...
Since async functions inside useEffect are quite common, rendering a component containing such a hook should wait for the component updates to have finished (with a small timeout).👍 26 ️ 10 Member kentcdodds commented May 13, 2020 Hi @fabb, There's no way for React Testing Library...
Also, you must be careful if you are using async callings inside the useEffect hook. I was concerned about this but I was doing it wrong in some parts. I'll share with you what I'm doing with my code now, which thanks to the tests and the library, I think is more solid: I'm ...