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第九章 React Router 6

二、代码实战

6. 路由的 params 参数

6.1 routes

/* src/routes/index.js */
import About from "../pages/About";
import Home from "../pages/Home";
import Message from "../pages/Message";
import News from "../pages/News";
import Detail from "../pages/Detail";
import { Navigate } from "react-router-dom";export default [{path: "/about",element: <About />,},{path: "/home",element: <Home />,children: [{path: "news",element: <News />,},{path: "message",element: <Message />,children: [{path: "detail/:id/:title/:content",element: <Detail />,},],},],},{path: "/",element: <Navigate to="/about" />,},
];

6.2 Detail.jsx

/* src/pages/Detail.jsx */
import React from "react";
import { useParams } from "react-router-dom";export default function Detail() {const { id, title, content } = useParams();// const x = useMatch('/home/message/detail/:id/:title/:content')// console.log(x)return (<ul><li>消息编号：{id}</li><li>消息标题：{title}</li><li>消息内容：{content}</li></ul>);
}

6.3 Message.jsx

/* src/pages/Message.jsx */
import React, { useState } from "react";
import { Link, Outlet } from "react-router-dom";export default function Message() {const [messages] = useState([{ id: "001", title: "消息1", content: "锄禾日当午" },{ id: "002", title: "消息2", content: "汗滴禾下土" },{ id: "003", title: "消息3", content: "谁知盘中餐" },{ id: "004", title: "消息4", content: "粒粒皆辛苦" },]);return (<div><ul>{messages.map((m) => {return (// 路由链接<li key={m.id}><Link to={`detail/${m.id}/${m.title}/${m.content}`}>{m.title}</Link></li>);})}</ul><hr />{/* 指定路由组件的展示位置 */}<Outlet /></div>);
}

7. 路由的 search 参数

7.1 routes

/* src/routes/index.js */
import About from "../pages/About";
import Home from "../pages/Home";
import Message from "../pages/Message";
import News from "../pages/News";
import Detail from "../pages/Detail";
import { Navigate } from "react-router-dom";export default [{path: "/about",element: <About />,},{path: "/home",element: <Home />,children: [{path: "news",element: <News />,},{path: "message",element: <Message />,children: [{path: "detail",element: <Detail />,},],},],},{path: "/",element: <Navigate to="/about" />,},
];

7.2 Detail.jsx

/* src/pages/Detail.jsx */
import React from "react";
import { useSearchParams, useLocation } from "react-router-dom";export default function Detail() {const [search, setSearch] = useSearchParams();const id = search.get("id");const title = search.get("title");const content = search.get("content");const x = useLocation();console.log("@", x);return (<ul><li><button onClick={() => setSearch("id=008&title=哈哈&content=嘻嘻")}>点我更新一下收到的search参数</button></li><li>消息编号：{id}</li><li>消息标题：{title}</li><li>消息内容：{content}</li></ul>);
}

7.3 Message.jsx

/* src/pages/Message.jsx */
import React,{useState} from 'react'
import {Link,Outlet} from 'react-router-dom'export default function Message() {const [messages] = useState([{id:'001',title:'消息1',content:'锄禾日当午'},{id:'002',title:'消息2',content:'汗滴禾下土'},{id:'003',title:'消息3',content:'谁知盘中餐'},{id:'004',title:'消息4',content:'粒粒皆辛苦'}])return (<div><ul>{messages.map((m)=>{return (// 路由链接<li key={m.id}><Link to={`detail?id=${m.id}&title=${m.title}&content=${m.content}`}>{m.title}</Link></li>)})}</ul><hr />{/* 指定路由组件的展示位置 */}<Outlet /></div>)
}

8. 路由的 state 参数

8.1 routes

/* src/routes/index.js */
import About from "../pages/About";
import Home from "../pages/Home";
import Message from "../pages/Message";
import News from "../pages/News";
import Detail from "../pages/Detail";
import { Navigate } from "react-router-dom";export default [{path: "/about",element: <About />,},{path: "/home",element: <Home />,children: [{path: "news",element: <News />,},{path: "message",element: <Message />,children: [{path: "detail",element: <Detail />,},],},],},{path: "/",element: <Navigate to="/about" />,},
];

8.2 Detail.jsx

/* src/pages/Detail.jsx */
import React from "react";
import { useLocation } from "react-router-dom";export default function Detail() {const {state: { id, title, content },} = useLocation();return (<ul><li>消息编号：{id}</li><li>消息标题：{title}</li><li>消息内容：{content}</li></ul>);
}

8.3 Message.jsx

/* src/pages/Message.jsx */
import React, { useState } from "react";
import { Link, Outlet } from "react-router-dom";export default function Message() {const [messages] = useState([{ id: "001", title: "消息1", content: "锄禾日当午" },{ id: "002", title: "消息2", content: "汗滴禾下土" },{ id: "003", title: "消息3", content: "谁知盘中餐" },{ id: "004", title: "消息4", content: "粒粒皆辛苦" },]);return (<div><ul>{messages.map((m) => {return (// 路由链接<li key={m.id}><Linkto="detail"state={{id: m.id,title: m.title,content: m.content,}}>{m.title}</Link></li>);})}</ul><hr />{/* 指定路由组件的展示位置 */}<Outlet /></div>);
}

9. 编程式路由导航

9.1 Header.jsx

/* src/components/Header.jsx */
import React from "react";
import { useNavigate } from "react-router-dom";export default function Header() {const navigate = useNavigate();function back() {navigate(-1);}function forward() {navigate(1);}return (<div className="col-xs-offset-2 col-xs-8"><div className="page-header"><h2>React Router Demo</h2><button onClick={back}>←后退</button><button onClick={forward}>前进→</button></div></div>);
}

9.2 Message.jsx

/* src/pages/Message.jsx */
import React, { useState } from "react";
import { Link, Outlet, useNavigate } from "react-router-dom";export default function Message() {const navigate = useNavigate();const [messages] = useState([{ id: "001", title: "消息1", content: "锄禾日当午" },{ id: "002", title: "消息2", content: "汗滴禾下土" },{ id: "003", title: "消息3", content: "谁知盘中餐" },{ id: "004", title: "消息4", content: "粒粒皆辛苦" },]);function showDetail(m) {navigate("detail", {replace: false,state: {id: m.id,title: m.title,content: m.content,},});}return (<div><ul>{messages.map((m) => {return (// 路由链接<li key={m.id}><Linkto="detail"state={{id: m.id,title: m.title,content: m.content,}}>{m.title}</Link><button onClick={() => showDetail(m)}>查看详情</button></li>);})}</ul><hr />{/* 指定路由组件的展示位置 */}<Outlet /></div>);
}

9.3 App.jsx

/* src/App.jsx */
import React from "react";
import { NavLink, useRoutes } from "react-router-dom";
import routes from "./routes";
import Header from "./components/Header";export default function App() {//根据路由表生成对应的路由规则const element = useRoutes(routes);return (<div><div className="row"><Header /></div><div className="row"><div className="col-xs-2 col-xs-offset-2"><div className="list-group">{/* 路由链接 */}<NavLink className="list-group-item" to="/about">About</NavLink><NavLink className="list-group-item" to="/home">Home</NavLink></div></div><div className="col-xs-6"><div className="panel"><div className="panel-body">{/* 注册路由 */}{element}</div></div></div></div></div>);
}