笔记二十二、使用路由state进行传递参数

约定不等于承诺〃 2024-05-01 16:24 6阅读 0赞

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

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'}}>
                        {/**/}
                        <Outlet/>
                    </div>
                </div>);
        }
    }
    
    export default App;

22.2 子组件获取state参数

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

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'/>,
        }
    ]