笔记二十三**、编程式路由导航

23.1 父组件引入 useNavigate

import {NavLink, Outlet, useNavigate} from "react-router-dom";
......
// 编程式路由导航
    const navigate = useNavigate();
    const toClassify = () => {
        navigate('classify', {state: {param_C: 'elendalee', param_D: 20}})
    };
......
<button onClick={toClassify}>classify</button>

父组件 Home/ndex.jsx

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

const Home = () => {

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

    // 编程式路由导航
    const navigate = useNavigate();
    const toClassify = () => {
        navigate('classify', {state: {param_C: 'elendalee', param_D: 20}})
    };

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

}

export default Home;

子组件 classify.jsx

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

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'/>,
    }
]

main.jsx

import React from 'react'
import ReactDOM from 'react-dom/client'
import App from './App.jsx'
import { HashRouter } from "react-router-dom";

// 日常开发推荐 哈希路由 HashRouter 防止出现404报错
ReactDOM.createRoot(document.getElementById("root")).render(
    <React.StrictMode>
        <HashRouter>
            <App text={"react"} />
        </HashRouter>
    </React.StrictMode>
);

app.jsx

import React from "react";
import {NavLink, useRoutes} from "react-router-dom";
import routes from "./routes/index.jsx";
import "./app.css"

const App = () => {
    const element = useRoutes(routes);
    // 选中高亮
    const activeStyle = ({isActive}) => {
        return isActive ? 'background' : "";
    };
    return (
        <div className="all">
            <div>
                <div className="link">
                    <NavLink to="/home" className={activeStyle}>打开首页的页面</NavLink>
                </div>
                <div className="link">
                    <NavLink to="/about" className={activeStyle}>打开关于的页面</NavLink>
                </div>
            </div>
            <div className="view">
                {element}
            </div>
        </div>
    );
}

export default App;

代码007普通

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