react router 4.0以上的路由应用

react router 4.0以上的路由应用

在4.0以下的react router中，嵌套的路由可以放在一个router标签中，形式如下,嵌套的路由也直接放在一起。

<Route component={App}>
    <Route path="groups" components={Groups} />
    <Route path="users" components={Users}>
      <Route path="users/:userId" component={Profile} />
    </Route>
</Route>

但是在4.0以后，嵌套的路由与之前的就完全不同了，需要单独放置在嵌套的根component中去处理路由，否则会一直有warning:

You should not use <Route component> and <Route children> in the same route

正确形式如下

<Route component={App}>
    <Route path="groups" components={Groups} />
    <Route path="users" components={Users}>
      //<Route path="users/:userId" component={Profile} />
    </Route>
</Route>

上面将嵌套的路由注释掉

const Users = ({ match }) => (
  <div>
    <h2>Topics</h2>
    <Route path={`${match.url}/:userId`} component={Profile}/>
  </div>
) 

上面在需要嵌套路由的component中添加新的路由

一个完整的嵌套路由的例子如下

说明及注意事项

1. 以下代码采用ES6格式
2. react-router-dom版本为4.1.1
3. 请注意使用诸如HashRouter之类的history，否则一直会有warning，不能渲染

import React, { Component } from 'react';
import ReactDOM from 'react-dom';
// import { Router, Route, Link, Switch } from 'react-router';
import {
  HashRouter,
  Route,
  Link,
  Switch
} from 'react-router-dom';

class App extends Component {
  render() {
    return (
      <div>
        <h1>App</h1>
        <ul>
          <li><Link to="/">Home</Link></li>
          <li><Link to="/about">About</Link></li>
          <li><Link to="/inbox">Inbox</Link></li>
        </ul>
        {this.props.children}

      </div>
    );
  }
}

const About = () => (
  <div>
    <h3>About</h3>
  </div>
)

const Home = () => (
  <div>
    <h3>Home</h3>
  </div>
)

const Message = ({ match }) => (
  <div>
    <h3>new messages</h3>
    <h3>{match.params.id}</h3>
  </div>
)

const Inbox = ({ match }) => (
  <div>
    <h2>Topics</h2>
    <Route path={`${match.url}/messages/:id`} component={Message}/>

  </div>
) 

ReactDOM.render(
  (<HashRouter>
    <App>
        <Route exact path="/" component={Home} />
        <Route path="/about" component={About} />
        <Route path="/inbox" component={Inbox} />
    </App>
  </HashRouter>),
  document.getElementById('root')
);

参考

• https://stackoverflow.com/questions/42845834/why-can-i-not-nest-route-components-in-react-router-4-x

• https://code.tutsplus.com/tutorials/understanding-nested-routing-in-react–cms-27955