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[英]How can I solve 'Functions are not valid as a React child.' error?
[英]How to solve "Functions are not valid as a React child." error when I try to render a components based on the output of a function?
在應用程序的 App.js 文件中,我正在設置應用程序的路由。
這是我的 App.js 文件的代碼
import React, {useEffect} from "react";
import {Container} from '@material-ui/core';
import {BrowserRouter, Routes, Route, Navigate} from 'react-router-dom';
import { gapi } from 'gapi-script';
import Navbar from "./components/Navbar/Navbar";
import Home from './components/Home/Home';
import Auth from "./components/Auth/Auth";
import MealsPage from "./components/MealsPage/MealsPage";
import WorkoutDetails from "./components/WorkoutDetails/WorkoutDetails";
const App=()=>{
const user=JSON.parse(localStorage.getItem('profile'));
useEffect(() => {
const start = () => {
gapi.auth2.init({
clientId: process.env.REACT_APP_GOOGLE_API_TOKEN,
scope: ""
})
};
gapi.load('client:auth2', start);
})
return(
<BrowserRouter>
<Container maxWidth="xl">
<Navbar/>
<Routes>
<Route path="/" exact ={()=>{<Navigate to="/workouts"/>}}/>
<Route path="/workouts" exact element={<Home/>}/>
<Route path="/workouts/search" exact element={<Home/>}/>
<Route path="/workouts/:id" element={<WorkoutDetails/>}/>
<Route path="/meals" exact element={<MealsPage/>}/>
<Route path="/auth" exact element={()=>{!user? <Auth/>:<Navigate to="/workouts"/>}}/>
</Routes>
</Container>
</BrowserRouter>
);
}
export default App;
我收到一條錯誤消息:
react-dom.development.js:67
Warning: Functions are not valid as a React child. This may happen if you return a Component instead of <Component /> from render. Or maybe you meant to call this function rather than return it.
我假設它來自 Auth 路由,因為它沒有指定當我們擁有該特定路由時要呈現的元素,但它指定了一個函數。 基本上,當用戶登錄時,他不應該看到 auth 組件,因為他已經登錄並且他應該被重定向到“/workouts”路徑,這是應用程序中的另一個頁面。
你能幫我解決這個問題嗎?
這里element={()=>{!user? <Auth/>:<Navigate to="/workouts"/>}}
element={()=>{!user? <Auth/>:<Navigate to="/workouts"/>}}
。 像element={user? <Navigate to="/workouts"/> : <Auth/>}
element={user? <Navigate to="/workouts"/> : <Auth/>}
或返回像element={()=>!user? <Auth/>:<Navigate to="/workouts"/>}
element={()=>!user? <Auth/>:<Navigate to="/workouts"/>}
或element={()=>{return !user? <Auth/>:<Navigate to="/workouts"/>}}
element={()=>{return !user? <Auth/>:<Navigate to="/workouts"/>}}
查看<Route />
的文檔, element
prop 是一個元素,而不是返回元素的函數。
因此,您應該能夠簡單地刪除函數調用並直接傳遞元素:
<Route
path="/auth"
exact
element={!user ? <Auth/> : <Navigate to="/workouts"/>}
/>
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