笔记二十二、使用路由state进行传递参数

22.1 父组件设置state路由参数

<NavLink to='classify' state={{param_C: this.state.name, param_D: this.state.age}}

className={this.activeStyle}>classify</NavLink>

父组件 Home/index.jsx

javascript 复制代码

import React from "react";
import {NavLink, Outlet} from "react-router-dom";

class App extends React.Component {

    // 类组件中不能用const定义变量
    // 选中高亮
    activeStyle = ({isActive}) => {
        return isActive ? 'background' : "";
    };
    state = {name: 'elendaLee', age: 20};

    render() {
        return (
            <div>
                首页的页面
                <div style={{display: "flex", justifyContent: 'center', marginTop: '20px'}}>
                    <NavLink to='classify' state={{param_C: this.state.name, param_D: this.state.age}}
                             className={this.activeStyle}>classify</NavLink>
                    <NavLink to='navigation' className={this.activeStyle}>navigation</NavLink>
                </div>
                <div style={{background: 'red'}}>
                    {/*<!-- Renders the child route's element, if there is one. -->*/}
                    <Outlet/>
                </div>
            </div>);
    }
}

export default App;

22.2 子组件获取state参数

javascript 复制代码

import React from 'react';
import {useLocation} from "react-router-dom";

const Classify = () => {
    // 两次结构赋值
    const {
        state: {
            param_C, param_D
        },
    } = useLocation();
    return (
        <div>
            分类的页面
            <div>
                父组件home传递的参数1：{param_C}
                父组件home传递的参数2：{param_D}
            </div>
        </div>
    );
}

export default Classify;

路由表无需改动

javascript 复制代码

import {Navigate} from "react-router-dom";
import Home from "../components/Home";
import About from "../components/About";
import Classify from "../components/Home/components/Classify.jsx";
import Navigation from "../components/Home/components/Navigation.jsx";

export default [
    {
        path: '/home',
        element: <Home/>,
        children: [
            {
                path: 'classify',
                element: <Classify/>
            },
            {
                path: 'navigation',
                element: <Navigation/>
            },
        ]
    },
    {
        path: '/about',
        element: <About/>,
    },
    {
        path: '/',
        element: <Navigate to='about'/>,
    }
]