通过一个用户管理实例学习路由react-router-dom…

import React, {Component} from 'react';
//Router 容器，它是用来包裹路由规则的
//Route 是路由规则
//BrowserRouter基于h5的。兼容性不好
//引入react-router-demo
import {HashRouter as Router, Route,Link,NavLink,Switch} from 'react-router-dom';
//引入我们需要的组件
import Home from "./Home";
import User from "./User";
import Profile from "./Profile";
import Login from "./Login";
import Protected from './Protected'
//定义一个App组件
export default class App extends Component {
    render() {
        //定义一个我们选中的状态
        let activeStyle={color:'red'}
        return (
            <Router>
                <div className="container">
                    <nav className='nav navbar-default'>
                        <div className="container-fluid">
                            <a className="navbar-brand">用户管理</a>
                        </div>
                        <ul className="nav">
                            <li className='navbar-nav'><NavLink exact activeStyle={activeStyle} to="/">首页</NavLink></li>
                            <li className='navbar-nav'><NavLink activeStyle={activeStyle} to="/user">用户管理</NavLink></li>
                            <li className='navbar-nav'><NavLink activeStyle={activeStyle} to="/profile">个人中心</NavLink></li>
                        </ul>
                    </nav>
                    <div>
                        {/*Switch是匹配*/}
                        {/*exact 我们匹配/斜杠时候，就匹配第一个*/}
                        <Switch>
                        <Route exact path="/" component={Home}/>
                        <Route path="/user" component={User}/>
                            <Protected path="/profile" component={Profile}/>
                            <Route path="/login" component={Login}/>

                        </Switch>
                    </div>
                </div>
            </Router>
        )
    }
}

import React, {Component} from 'react'
import {Link,Route,NavLink} from 'react-router-dom'
import UsersList from './UsersList'
import UsersAdd from './UsersAdd'
import UserDetail from "./UserDetail";
export default class User extends Component {
    render() {
        let activeStyle={color:'red'}
        return (
            <div className='row'>
                <div className="col-sm-3">
                    <nav>
                        <ul className="nav nav-stacked">
                            <li><NavLink activeStyle={activeStyle} to="/user/list">用户列表</NavLink></li>
                            <li><NavLink activeStyle={activeStyle} to="/user/add">添加用户</NavLink></li>
                        </ul>
                    </nav>
                </div>
                <div className="col-sm-9">
                    <Route path="/user/list" component={UsersList}></Route>
                    <Route path="/user/add" component={UsersAdd}></Route>
                    <Route path="/user/detail/:id" component={UserDetail}></Route>
                </div>
            </div>
        )
    }
}

import React, {Component} from 'react'

export default class UsersAdd extends Component {
    handleSubmit=()=>{
        let username=this.refs.username.value;
        let password=this.refs.password.value;
        let user={username,password,id:Date.now()};
        let users=JSON.parse(localStorage.getItem('USERS')||"[]");
        users.push(user);
        localStorage.setItem('USERS',JSON.stringify(users));
        this.props.history.push('/user/list')
    }
    render() {
        /*
        * history 用来跳转页面
        * location.pathname 用来存放当前路径
        * match代表匹配的结果
        *
        * */
        return (
            <form onSubmit={this.handleSubmit}>
                <div className="form-group">
                    <label htmlFor="username" className="control-label">
                        用户名
                    </label>
                    <input type="text" className="form-control" ref="username" placeholder="用户名"/>
                </div>
                <div className="form-group">
                    <label htmlFor="username" className="control-label">
                        密码
                    </label>
                    <input type="password" className="form-control" ref="password" placeholder="密码"/>
                </div>
                <div className="form-group">

                    <input type="submit" className="btn btn-danger" />
                </div>
            </form>
        )
    }
}

import React, {Component} from 'react'
import {Link} from 'react-router-dom'
export default class UsersList extends Component {
    constructor(){
        super();
        this.state={users:[]}
    }
    componentWillMount(){
        let users = JSON.parse(localStorage.getItem('USERS') || "[]");
        this.setState({users});
    }
    render(){
        return (
           <ul className="list-group">
               {
                   this.state.users.map((user,index)=>(
                       <li key={index} className="list-group-item">
                           <span>用户名:</span>
                           <Link to={`/user/detail/${user.id}`}>{user.username}</Link>
                          <span className="btn btn-danger" onClick={()=>{
                              let users=this.state.users.filter(item=>item.id!=user.id)
                              this.setState({users});
                          }}>删除</span>
                       </li>
                   ))
               }
           </ul>
        )
    }
}

import React, {Component} from 'react'

export default class UserDetail extends Component {



    render() {
        // let user=this.props.location.state.user
        let users = JSON.parse(localStorage.getItem('USERS')||"[]");
        let id = this.props.match.params.id;
        let user = users.find(item=>item.id == id);
        return (
            <table className="table table-bordered">
                <thead>
                <tr>
                    <th>ID</th>
                    <th>用户名</th>
                    <th>密码</th>
                </tr>
                </thead>
                <tbody>
                    <tr>
                    <td>{user.id}</td>
                    <td>{user.username}</td>
                    <td>{user.password}</td>
                    </tr>
                </tbody>
            </table>
        )
    }
}

import React from 'react';
import {Route, Redirect} from 'react-router-dom';
//函数组件
//把属性对象中的Component属性取出来赋给comp,把其它属性取出来赋给other对象
//再把other对象的全部属性取出来赋给Route
// component=组件
// render函数 当路由匹配的时候，渲染的是render方法的返回值
export default function ({component: _comp, ...rest}) {
    return <Route {...rest} render={
        props => localStorage.getItem('login') ? <_comp/> :
            <Redirect to={{pathname: '/login', state: {from: props.location.pathname}}}/>
    }/>
    return null;
}

import React, {Component} from 'react';
export default class Login extends Component {
    handleClick = ()=>{
        localStorage.setItem('login','true');
        console.log(this.props);
        this.props.history.push(this.props.location.state.from);
    }
    render() {
        return (
            <div>
                <button
                    onClick={this.handleClick}
                    className="btn btn-primary">登录
                </button>
            </div>
        )
    }
}