React页面路由参数传递、嵌套路由


1. 页面路由参数传递

1.1 动态路由参数

描述:

以“/detail/:id”形式传递的数据,在落地组件中通过this.props.match.params得到。

使用:

App.jsx:

import React, {
    
     Component } from 'react'
import {
    
     Route, Link, NavLink, Switch, Redirect } from 'react-router-dom'

// 匹配成功后渲染的组件
import Home from './views/Home'
import About from './views/About'
import Detail from './views/Detail'
import Notfound from './views/Notfound'

class App extends Component {
    
    
  render() {
    
    
    return (
      <div>
        <h3>App组件</h3>
        <div>
          <NavLink exact to="/">Home</NavLink>---
          <NavLink to="/about">About</NavLink>
        </div>
        <hr />

        <Route path="/home" component={
    
    Home} />
        <Route path="/about" component={
    
    About} />
        {
    
    /* /detail/1   /detail/2 ... 匹配成功;参数可以传递多个 */}
        <Route path="/detail/:id/:name?" component={
    
    Detail} />
            
        <Redirect exact from="/" to="/home" />
            
        <Route component={
    
    Notfound} />
        </Switch>
      </div>
    )
  }
}

export default App

about页面:

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

class About extends Component {
    
    
  render() {
    
    
    return (
      <div>
        <h3>关于我们</h3>
        <hr />
        <ul>
          {
    
    Array(10)
            .fill('')
            .map((_, index) => (
              <li key={
    
    index}>
                <Link to={
    
    `/detail/${
      
      index}?`}>新闻 -- {
    
    index}</Link>
              </li>
            ))}
        </ul>
      </div>
    )
  }
}

export default About

详情页面:

import React, {
    
     Component } from 'react'

class Detail extends Component {
    
    
  render() {
    
    
    // 获取动态路由参数   对象
    let id = this.props.match.params.id || 0

    return (
      <div>
        <h3>详情页面 --- {
    
    id}</h3>
      </div>
    )
  }
}

export default Detail

在这里插入图片描述

1.2 search字符串

描述:

通过地址栏中的 ?key=value&key=value传递。

使用:

关于页面:

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

class About extends Component {
    
    
  render() {
    
    
    return (
      <div>
        <h3>关于我们</h3>
        <hr />
        <ul>
          {
    
    Array(10)
            .fill('')
            .map((_, index) => (
              <li key={
    
    index}>
                <Link to={
    
    `/detail/${
      
      index}?age=${
      
      2 + index}`}>新闻 -- {
    
    index}</Link>
              </li>
            ))}
        </ul>
      </div>
    )
  }
}

export default About

详情页面:

import React, {
    
     Component } from 'react'
import qs from 'querystring'

// 封装一个方法,获取数据
// String.prototype.toSearch = function () {
    
    
//   let searchData = {}
//   const search = new URLSearchParams(this)
//   search.forEach((value, key) => {
    
    
//     searchData[key] = value
//   })
//   return searchData
// }

class Detail extends Component {
    
    
  render() {
    
    
    // 获取动态路由参数   对象
    let id = this.props.match.params.id || 0

    // search字符串  字符串
    console.log(this.props.location.search)
    // 将字符串转为对象
    console.log(qs.parse(this.props.location.search.slice(1)))
    
    // 如果用search字符串,推荐用它
    const search = new URLSearchParams(this.props.location.search)
    // 获取就字段数据
    console.log(search.get('age'))
    let searchData = {
    
    }
    search.forEach((value, key) => {
    
    
      searchData[key] = value
    })
    console.log(searchData)

    // 使用迭代对象获取
    // for (let [key, value] of search.entries()) {
    
    
    //   searchData[key] = value
    // }
    // console.log(searchData)

    // 使用封装的方法获取
    // console.log(this.props.location.search.toSearch())

    return (
      <div>
        <h3>详情页面 --- {
    
    id}</h3>
      </div>
    )
  }
}

export default Detail

在这里插入图片描述

1.3 页面参数隐式传递

描述:

隐式传参(state),通过地址栏是观察不到的;通过路由对象中的state属性进行数据传递,在落地组件中通过this.props.location.state得到。

使用:

home页面:

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

class Home extends Component {
    
    
  jumpDetail = () => {
    
    
    this.props.history.push({
    
    
      pathname: '/detail',
      search: 'name=zhangsan',
      state: {
    
     id: 200 }
    })
  }
  
  render() {
    
    
    return (
      <div>
        <div>
          {
    
    /* 通过state隐式来传递数据到目标页面 */}
          <Link to={
    
    {
    
     pathname: '/detail', state: {
    
     id: 100 }, search: 'name=lisi' }}>去详情</Link>
        </div>
        <hr />
        {
    
    /* 编程式导航 */}
        <button onClick={
    
    this.jumpDetail}>去详情页</button>
      </div>
    )
  }
}

export default Home

详情页面:

import React, {
    
     Component } from 'react'

class Detail extends Component {
    
    
  render() {
    
    
    // 获取页面隐式传过来的state数据  对象
    console.log(this.props.location.state)
    console.log(this.props.location.search.toSearch())
    return (
      <div>
        <h3>详情页面</h3>
      </div>
    )
  }
}

export default Detail

tosearch方法(已导入入口文件中,所以可以直接使用):

String.prototype.toSearch = function () {
    
    
  let searchData = {
    
    }
  if (this.toString() != '') {
    
    
    const search = new URLSearchParams(this.toString())
    search.forEach((value, key) => {
    
    
      searchData[key] = value
    })
  }
  return searchData
}

在这里插入图片描述

2. 嵌套路由

后台首页:

import React, {
    
     Component } from 'react'
import {
    
     NavLink, Redirect, Route, Switch } from 'react-router-dom'
import {
    
     AdminContainer } from './style'

import Index from '../Index'
import User from '../User'

class Admin extends Component {
    
    
  render() {
    
    
    // 在子路由定义的组件中,可以通过props中提供的路由对象来获取父路由定义的地址
    // let parentRoutePath = this.props.match.path

    return (
      <AdminContainer>
        <h3>后台首页</h3>
        <div>
          <ul>
            <li>
              <NavLink to="/admin/index">后台首页</NavLink>
            </li>
            <li>
              <NavLink to="/admin/user">用户列表</NavLink>
            </li>
          </ul>
          <div>
            <Switch>
              <Route path='/admin/index' component={
    
    Index} />
              <Route path='/admin/user' component={
    
    User} />
              <Redirect from='/admin' to='/admin/index' />
            </Switch>
          </div>
        </div>
      </AdminContainer>

      // <AdminContainer>
      //   <h3>后台首页</h3>
      //   <div>
      //     <ul>
      //       <li>
      //         <NavLink to={`${parentRoutePath}/index`}>后台首页</NavLink>
      //       </li>
      //       <li>
      //         <NavLink to={`${parentRoutePath}/user`}>用户列表</NavLink>
      //       </li>
      //     </ul>
      //     <div>
      //       <Switch>
      //         <Route path={`${parentRoutePath}/index`} component={Index} />
      //         <Route path={`${parentRoutePath}/user`} component={User} />
      //         <Redirect exact from={parentRoutePath} to={`${parentRoutePath}/index`} />
      //       </Switch>
      //     </div>
      //   </div>
      // </AdminContainer>
    )
  }
}

export default Admin

在这里插入图片描述

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转载自blog.csdn.net/weixin_45605541/article/details/127034687