react路由器中的activeClassName同时突出显示两个NavLink

Question

我正在学习React Router并遵循本教程, 除了突出显示活动NavLink的问题外,一切都很清楚并且按照指示工作(谢谢作者).

看一下css文件并注意.current类:

nav ul {
  list-style: none;
  display: flex;
  background-color: black;
  margin-bottom: 20px;
}

nav ul li {
  padding: 20px;
}

nav ul li a {
  color: white;
  text-decoration: none;
}

.current {
  border-bottom: 4px solid white;
}

当我加载应用程序时,导航中的主页链接以白色底部边框线突出显示,但即​​使我点击"关于"链接或"联系人"链接,它也会保持突出显示.我一步一步地遵循了一切,但这个问题我无法弄清楚.

在阅读了关于NavLink的反应文档和在线的许多教程之后,仍然不知道如何修复它.

这是我点击about链接的时候

这是我点击联系链接的时候

这是教程路由示例的方式

<nav>
    <ul>
      <li><NavLink exact activeClassName="current" to='/'>Home</NavLink></li>
      <li><NavLink exact activeClassName="current" to='/about'>About</NavLink></li>
      <li><NavLink exact activeClassName="current" to='/contact'>Contact</NavLink></li>
    </ul>
  </nav>

请注意Home链接如何与其下的活动白线保持一致,尽管它不再是活动链接.

添加activeClassName ="current"假设突出显示带有白色下划线的当前视图,但主页链接保持以白色下划线突出显示.

所以,对于那些有多年经验的人,请帮忙.

这是我的app.js

    import React, { Component } from 'react';
import './App.css';
import Main from './components/main';
import Navigation from './components/navigation';




class App extends Component {
  render() {
    return (
        <div>
            <h1> React Router </h1>;
            <h5>  import 'BrowserRouter' from 'react-router-dom' in Appjs</h5>
            <hr></hr>

            <Navigation />

            <Main />
            </div>

    );
  }
}

 export default App;

这是我的index.js

    import React from 'react';
import ReactDOM from 'react-dom';
//Add browserrouter to use it in your app
import { BrowserRouter } from 'react-router-dom';
import './index.css';
import App from './App';
import * as serviceWorker from './serviceWorker';

//this router example is from this site 
//https://blog.pusher.com/getting-started-with-react-router-v4/
/*
You can only pass a single child element to a Router,
so it is necessary to create a root component
that renders the rest of your application and
then pass that in as the child of the Router.
*/
ReactDOM.render((
    <BrowserRouter>
        <App />
    </BrowserRouter>
), document.getElementById('root')); 

这是我的main.js

 import React, { Component } from 'react';
import { NavLink, Switch, Route } from 'react-router-dom';
import Home from './home';
import About from './about'
import Contact from './contact'

class Main extends Component {
    render() {
        return (
            <div>
                <p> My main component </p>
                <Switch>
                    <Route exact={true}  path='/' component={Home}></Route>
                    <Route   path='/about' component={About}></Route>
                    <Route   path='/contact' component={Contact}></Route>
                    </Switch>
            </div>
        );
    }
}

export default Main;

最后这是我的navigation.js

    import React, { Component } from 'react';
import { NavLink } from 'react-router-dom';

class Navigation extends Component {
    render() {
        return (
            <div>
            <p> My Navigation component </p>
            <nav>
                <ul>
                    <li><NavLink to='/'> Home </NavLink> </li>
                    <li><NavLink to='/about'> About </NavLink> </li>
                    <li><NavLink to='/contact'> Contact </NavLink> </li>
                </ul>
            </nav>
                </div>
        );
    }
}

export default Navigation;

Answer 1

改为:

import React, { Component } from 'react';
import { NavLink } from 'react-router-dom';

class Navigation extends Component {
  render() {
    return (
      <div>
        <p> My Navigation component </p>
        <nav>
          <ul>
            <li><NavLink to='/' activeClassName="current" exact={true}> Home </NavLink> </li>
            <li><NavLink to='/about' activeClassName="current"> About </NavLink> </li>
            <li><NavLink to='/contact' activeClassName="current"> Contact </NavLink> </li>
          </ul>
        </nav>
      </div>
    );
  }
}

export default Navigation;

Answer 2

您应该将该exact属性添加到您的 root("") 路由，否则，它将匹配以“”开头的每个路由，React Router 精确

例如：

<Route exact path="/" component={Home} />
<Route path="/about" component={About} />
<Route path="/topics" component={Topics} />

更新：

在没有确切属性的情况下，更改顺序也将具有相同的效果

<Route path="/about" component={About} />
<Route path="/topics" component={Topics} />
<Route path="/" component={Home} />

在路由器交换机旁边，它将转到第一个匹配的路由，如果我们/在开头添加带有路径的路由，它将始终渲染路径中的组件，最好避免使用顺序进行精确修复