首先,在该项目开始之前,还请大家能够先下载一个项目脚手架。本教程基于该脚手架进行开发
Router,hashHistory,Route
首先下载react-router
npm install react-router --save
需要注意的是,react-router更新很快,API也在持续升级,也许你看到市面很多教程,但可能那还是1.x甚至是0.x版本的。
我们首先在App.jsx写一个简单示例,让你快速的对react-router有印象。
代码清单:app/container/App/App.jsx
import React, { Component } from 'react';import { Router, Route, hashHistory } from 'react-router';const Home = () => <div><h1>Home</h1></div>;const About = () => <div><h1>About</h1></div>;const Contact = () => <div><h1>Contact</h1></div>;class App extends Component { render() { return ( <Router history={hashHistory}> <Route path="/" component={Home} /> <Route path="/about" component={About} /> <Route path="/contact" component={Contact} /> </Router> ); } } export default App;
Link
Link是react-router提供的导航组件,可以直接使用进行路由切换
代码清单:app/container/App/App.jsx
import React, { Component } from 'react'; import { Router, Route, hashHistory, Link } from 'react-router'; const Home = () => <div><h1>Home</h1><Links /></div>; const About = () => <div><h1>About</h1><Links /></div>; const Contact = () => <div><h1>Contact</h1><Links /></div>; const Links = () => <nav> <Link to="/">Home</Link> <Link to="/about">About</Link> <Link to="/contact">Contact</Link> </nav>class App extends Component { render() { return ( <Router history={hashHistory}> <Route path="/" component={Home} /> <Route path="/about" component={About} /> <Route path="/contact" component={Contact} /> </Router> ); } } export default App;
browserHistory
browserHistory和hashHistory不一样,使用browserHistory的时候,浏览器中导航栏的URL就不会出现_k的hash键值对。实际项目中也一般用browserHistory.
import React, { Component } from 'react'; import { Router, Route, browserHistory, Link } from 'react-router'; const Home = () => <div><h1>Home</h1><Links /></div>; const About = () => <div><h1>About</h1><Links /></div>; const Contact = () => <div><h1>Contact</h1><Links /></div>; const Links = () => <nav> <Link to="/">Home</Link> <Link to="/about">About</Link> <Link to="/contact">Contact</Link> </nav>class App extends Component { render() { return ( <Router history={browserHistory}> <Route path="/" component={Home} /> <Route path="/about" component={About} /> <Route path="/contact" component={Contact} /> </Router> ); } } export default App;
这样正常点击路由切换没有问题,但是重新刷新URL就会报找不到路由,这个时候我们在webpack-dev-server启动的时候需要加上参数--history-api-fallback
。
activeStyle,activeClassName
当前路由被点击处于触发显示状态的时候,我们可以使用activeStyle来给路由设置一些颜色
import React, { Component } from 'react'; import { Router, Route, browserHistory, Link } from 'react-router'; const Home = () => <div><h1>Home</h1><Links /></div>; const About = () => <div><h1>About</h1><Links /></div>; const Contact = () => <div><h1>Contact</h1><Links /></div>; const Links = () => <nav> <Link activeStyle={{color: 'red'}} to="/">Home</Link> <Link activeStyle={{color: 'red'}} to="/about">About</Link> <Link activeStyle={{color: 'red'}} to="/contact">Contact</Link> </nav>class App extends Component { render() { return ( <Router history={browserHistory}> <Route path="/" component={Home} /> <Route path="/about" component={About} /> <Route path="/contact" component={Contact} /> </Router> ); } } export default App;
同理,我们还可以使用activeClassName来将路由激活状态的样式抽取出来。
我们在App.css写一个样式,代码清单:app/containers/App/App.jsx
.active { color: red; }
然后修改App.jsx
import React, { Component } from 'react'; import { Router, Route, browserHistory, Link } from 'react-router'; import './App.css'; const Home = () => <div><h1>Home</h1><Links /></div>; const About = () => <div><h1>About</h1><Links /></div>; const Contact = () => <div><h1>Contact</h1><Links /></div>; const Links = () => <nav> <Link activeClassName="active" to="/">Home</Link> <Link activeClassName="active" to="/about">About</Link> <Link activeClassName="active" to="/contact">Contact</Link> </nav>class App extends Component { render() { return ( <Router history={browserHistory}> <Route path="/" component={Home} /> <Route path="/about" component={About} /> <Route path="/contact" component={Contact} /> </Router> ); } } export default App;
路由嵌套
刚才讲的是简单路由的切换,但实际应用中,路由是分多个层级的。幸运的是,我们可以使用react-router的路由嵌套来清晰的管理路由和组件之间的切换展示。
import React, { Component } from 'react'; import { Router, Route, browserHistory, Link } from 'react-router'; import './App.css'; const Home = (props) => <div> <h1>Home</h1> <Links /> {props.children} </div>const About = (props) => <div> <h1>About</h1> {props.children} </div>const Contact = () => <div> <h1>Contact</h1> </div>const Links = () => <nav> <Link activeClassName="active" to="/">Home</Link> <Link activeClassName="active" to="/about">About</Link> <Link activeClassName="active" to="/about/contact">Contact</Link> </nav>class App extends Component { render() { return ( <Router history={browserHistory}> <Route path="/" component={Home}> <Route path="about" component={About}> <Route path="contact" component={Contact} /> </Route> </Route> </Router> ); } } export default App;
IndexRoute
IndexRoute即处理页面初始进入时候的组件展示,等路由切换的时候,再根据其他路由规则进行组件的切换展示。
import React, { Component } from 'react'; import { Router, Route, browserHistory, Link, IndexRoute } from 'react-router'; import './App.css'; const Home = (props) => <div> <h1>Home</h1> <Links /> {props.children} </div>const About = () => <div> <h1>About</h1> </div>const Contact = () => <div> <h1>Contact</h1> </div>const Links = () => <nav> <Link activeClassName="active" to="/">Home</Link> <Link activeClassName="active" to="/contact">Contact</Link> </nav>class App extends Component { render() { return ( <Router history={browserHistory}> <Route path="/" component={Home}> <IndexRoute component={About} /> <Route path="contact" component={Contact} /> </Route> </Router> ); } } export default App;
路由变量
刚才展示的是常规的路由,路由中的规则是给定的,现在我们尝试使用路由变量,在组件中获取这个路由的变量,并做相应的组件展示。
import React, { Component } from 'react'; import { Router, Route, hashHistory, Link, IndexRoute } from 'react-router'; import './App.css'; const Message = (props) => <div> <h1>{props.params.message || 'Hello'}</h1> <Links /> </div>const Links = () => <nav> <Link to="/">Hello</Link> <Link to="/yong">Yong</Link> <Link to="/feng">Feng</Link> </nav>class App extends Component { render() { return ( <Router history={hashHistory}> <Route path="/(:message)" component={Message} /> </Router> ); } } export default App;
Route中components参数的高级用法
Route中components中接收的参数不仅仅只是实际的组件,还可以是对象,通过这样的用法,我们可以更灵活的控制组件的展示。
import React, { Component } from 'react'; import { Router, Route, hashHistory, Link, IndexRoute } from 'react-router'; import './App.css'; const HomeHeader = () => <h1>HomeHeader</h1>const HomeBody = () => <h1>HomeBody</h1>const AboutHeader = () => <h1>AboutHeader</h1>const AboutBody = () => <h1>AboutBody</h1>const Container = (props) => <div> {props.header} {props.body} <Links /> </div>const Links = () => <nav> <Link to="/">Hello</Link> <Link to="/about">About</Link> </nav>class App extends Component { render() { return ( <Router history={hashHistory}> <Route path="/" component={Container}> <IndexRoute components={{ header:HomeHeader, body:HomeBody }} /> <Route path="about" components={{ header:AboutHeader, body:AboutBody }} /> </Route> </Router> ); } } export default App;
使用query获取URL中的参数
我们可以将URL中访问的参数获取,并且应用到组件中。
import React, { Component } from 'react'; import { Router, Route, hashHistory, Link, IndexRoute } from 'react-router'; import './App.css';const Page = (props) => <div> <h1>{props.location.query.message || 'Hello'}</h1> </div>class App extends Component { render() { return ( <Router history={hashHistory}> <Route path="/" component={Page} /> </Router> ); } } export default App;
然后在url中输入http://localhost:8080/#/?message=wn
,页面中就会显示wn。
另外,我们还可以在Link组件中设置pathname和query变量
import React, { Component } from 'react'; import { Router, Route, hashHistory, Link, IndexRoute } from 'react-router'; import './App.css';const Page = (props) => <div> <h1>{props.location.query.message || 'Hello'}</h1> </div>const Links = () => <nav> <Link to={{ pathname: "/", query: {message: "guoyongfeng"} }} /> </nav>class App extends Component { render() { return ( <Router history={hashHistory}> <Route path="/" component={Page} /> </Router> ); } } export default App;
Redirect重定向
import React, { Component } from 'react'; import { Router, Route, hashHistory, Link, Redirect } from 'react-router'; const Home = () => <div><h1>Home</h1><Links /></div>; const About = () => <div><h1>About</h1><Links /></div>; const Contact = () => <div><h1>Contact</h1><Links /></div>; const Links = () => <nav> <Link to="/">Home</Link> <Link to="/about">About</Link> <Link to="/contact">Contact</Link> <Link to="/contact-us">Contact US</Link> </nav>class App extends Component { render() { return ( <Router history={hashHistory}> <Route path="/" component={Home} /> <Route path="/about" component={About} /> <Route path="/contact-us" component={Contact} /> <Redirect from="/contact" to="/contact-us" /> </Router> ); } } export default App;
setRouteLeaveHook路由钩子函数:处理路由切换时的操作
import React, { Component, PropTypes } from 'react'; import { Router, Route, hashHistory, Link } from 'react-router'; class Home extends Component { componentWillMount(){ this.context.router.setRouteLeaveHook( this.props.route, this.routerWillLeave ) } routerWillLeave( nextLocation ){ return `页面即将从Home切换到${nextLocation.pathname}` } render(){ return <div> <h1>Home</h1> <Links /> </div> } } Home.contextTypes = { router: PropTypes.object.isRequired }; const Contact = () => <div><h1>Contact</h1><Links /></div>; const Links = () => <nav> <Link to="/">Home</Link> <Link to="/contact">Contact</Link> </nav>class App extends Component { render() { return ( <Router history={hashHistory}> <Route path="/" component={Home} /> <Route path="/contact" component={Contact} /> </Router> ); } } export default App;
最后
总的来说,react-router的学习难度不高,但是会有不同版本间API升级的坑,后续大家持续关注,或是使用某一个自己熟悉的react-router版本。
作者:一个胖子的我
链接:https://www.jianshu.com/p/21fa7ac36034
共同学习,写下你的评论
评论加载中...
作者其他优质文章