使用 react-router-dom 和 useParams 提取参数 id

Question

我正在尝试从 url 中提取参数并使用 useParams 将其保存为 redux 变量。所以我想要的是以下内容：

1. 我正在通过 url 打开带有餐厅 ID 的餐厅资料。
2. 我正在路由到 getRestaurantID 组件并提取 id 并调用 this.props.setRestaurantId(id) 并将 id 存储为 redux 变量。

我的问题是函数 this.props.setRestaurantId(id) 没有定义，我真的不知道为什么。你有什么建议吗？

这是我的代码：

import React from 'react';
import {BrowserRouter as Router, Switch, Route, Link, useRouteMatch, useParams} from "react-router-dom";
import HomeComponent from '../components/pages/home';
import AboutComponent from '../components/pages/about';
import RestaurantComponent from '../components/pages/restaurantProfile/restaurant';
import RestaurantList from "../components/pages/restaurantList";
import GetRestaurantId from "./getRestarauntID";



function router(){
    return (
            <Router>
                <Switch>
                    <Route path="/about">
                        <About/>
                    </Route>
                    <Route path="/restaurant/:id" children={<GetRestaurantId/>}/>
                    <Route path="/restaurants">
                        <Restaurants/>
                    </Route>
                    <Route path="/impressum">
                        <Impressum/>
                    </Route>
                    <Route path="/">
                        <Home/>
                    </Route>
                </Switch>
            </Router>
        );
    }

function Home() {
    return <HomeComponent/>
}

function About() {
    return <AboutComponent/>;
}

function Restaurants(){
    return <RestaurantList/>;
}

function Impressum(){
    return <h2>Impressum</h2>
}


export default router;




import React from 'react';
import {BrowserRouter as Router, Switch, Route, Link, useRouteMatch, useParams} from "react-router-dom";
import {connect} from "react-redux";
import Restaurant from "../components/pages/restaurantProfile/restaurant";

function GetId() {

    const { id } = useParams();
    console.log(id);
    this.props.setRestaurantId(id);

    return(
        <div>
            <Restaurant/>
        </div>
    )
}

const  mapDispatchToProps=(dispatch)=>{
    return {
        setRestaurantId: (data) => dispatch({type:'SET_RESTAURANT_ID', payload:data}),
    }
};


export default connect(null,mapDispatchToProps)(GetId);

Answer 1

您不能在功能组件中使用this.props。

您可以直接从函数参数访问道具。

function GetId({setRestaurantId}) {

    const { id } = useParams();
    console.log(id);
    setRestaurantId(id);

    return(
        <div>
            <Restaurant/>
        </div>
    )
}

const  mapDispatchToProps=(dispatch)=>{
    return {
        setRestaurantId: (data) => dispatch({type:'SET_RESTAURANT_ID', payload:data}),
    }
};


export default connect(null,mapDispatchToProps)(GetId);