嘗試將 react-transition-group 實現到 react-router 中會產生錯誤：“元素類型無效......”

Question

我正在嘗試使用 react-transition-group 模塊中的 CSSTransition 組件來實現頁面轉換，因為用戶從一個路由切換到另一個路由。 從我下面測試的代碼中，它生成以下錯誤：

元素類型無效：應為字符串（對於內置組件）或類/函數（對於復合組件）但得到：未定義。 您可能忘記從定義組件的文件中導出組件，或者您可能混淆了默認導入和命名導入

這是我的代碼示例：

import React from 'react';
import { BrowserRouter as Router, Route, Switch,  useParams, useLocation } from 'react-router-dom';
import Home from './Home';
import Login from './Login';
import SignUp from './SignUp';
import ManagerSignUp from './ManagerSignUp';
import ManagerLogin from './ManagerLogin';
import CreateEvent from './CreateEvent';
import RegisterVenue from './RegisterVenue';
import Dashboard from './Dashboard';
import ManagerDashboard from './ManagerDashboard';
import EventPage from './EventPage';
import './assets/pageTransitions.css'
import {
  TransitionGroup,
  CSSTransition
} from "react-transition-group";

const routes = [
  {path: '/', name: 'Home', Component: Home },
  {path: '/login', name: 'Login', Component: Login },
  {path: '/signup', name: 'Signup', Component: SignUp },
  {path: '/manager_signup', name: 'Manager Signup', Component: ManagerSignUp },
  {path: '/manager_login', name: 'Manager Login', Component: ManagerLogin },
  {path: '/eventcreate', name: 'Event Create', Component: CreateEvent },
  {path: '/registervenue', name: 'Register Venue', Component: RegisterVenue },
  {path: '/dashboard', name: 'Dashboard', Component: Dashboard },
  {path: '/manager_dashboard', name: 'Manager Dashboard', Component: ManagerDashboard },
  {path: '/event/:uid', name: 'Event Page', Component: EventPage },
]


export default function App() {
  // let {location} = window.location.origin
  return (
    <React.Fragment>
      <Router>
        <Switch>
          <Route>
            {routes.map(({ path, Component }) => (
              <Route key={path} exact path={path}>
                {({match}) => (
                  <CSSTransition
                    in={match != null}
                    timeout={300}
                    classNames="page"
                    unmountOnExit
                  >
                    <Component />
                  </CSSTransition>
                )}
              </Route>
            ))}
          </Route>
        </Switch>
      </Router>
    </React.Fragment>
  );
}

多次交叉檢查后，我無法確定此錯誤的性質。 我需要幫助確定為什么會發生這種情況以及如何解決它。

Answer 1

我在這里發現了一些錯誤，用這個替換你的 Switch 代碼

您沒有在此處傳遞組件，而是將所有 Route 放在錯誤的標記中

    <Switch>

        {routes.map(({ path, Component }) => (
          <Route key={path} exact path={path} component={Component} >
          </Route>
        ))}

    </Switch>

對於 CSSTransition，您可以創建一個 HOC（高階組件）並將其與所有組件一起使用，例如component={HOC(Component)}

高階：

import React , {useState,useEffect} from 'react';
import {
  TransitionGroup,
  CSSTransition
} from "react-transition-group";

export default (ComposedComponent) => {
  return (props) =>{  

  /* HOC : component is like write once and use any where.
    You can pass your any component it will return with your CSSTransition 
    for that component  */

    retun (
            <ComposedComponent {...props}>  
            {({match}) => (
              <CSSTransition
                in={match != null}
                timeout={300}
                classNames="page"
                unmountOnExit
              >
                 {props.children}
              </CSSTransition>
            )}                  
            </ComposedComponent>
    )
  };
};

最后一步是將您的 HOC 導入您的文件並將您的組件傳遞給它，例如

   import HOC from 'path of HOC'

  <Route key={path} exact path={path} component={HOC(Component)} >