match.params.id 在反应箭头功能组件中返回未定义

Question

I am creating a simple portfolio application for which I require a separate screen for each project from a list of projects. In doing so when I try to get the Id of that project from the URL using match.params.id , it gives a TypeError: Cannot read property 'params' of undefined . My code ProductScreenById:

import db from '../firebase'

export const ProjectScreenById = ({ match }) => {

    const pid = match.params.id

    return (
        <div>
            hello world
        </div>
    )
}

My ProjectListScreen:

import db from '../firebase'
import { Row, Col, Spinner } from 'react-bootstrap'
import { Project } from '../components/Project'

export const ProjectScreen = () => {
    
    const [projects, setProjects] = useState([])

    useEffect(() =>{
        db.collection('projects').orderBy('index','asc').onSnapshot(snapShot => {
            setProjects(snapShot.docs.map(doc => ({id:doc.id, project:doc.data()})))
        })
    },[])

    const windowWidth = () => {
        const { innerWidth:width, innerHeight:height } = window;
        return { width, height }
    }
    
    return (<>
            {projects.length===0 ? 
                <div className='mt-5 pt-5'>
                    <Spinner animation='border' style={{ width:100, height:100 }}/> 
                </div>
                : (
                <Row style={{ overflowX: 'hidden', width:'100%' }} className='pl-5 pt-5'>
                    {projects.map(project => (
                        <Col key={project.project.index} className='mr-2 mb-5'>
                            <Project 
                                description={project.project.description.split('.')}
                                title={project.project.title}
                                features={project.project.features.split('.')}
                                git={project.project.git}
                                link={project.project.link}
                                index={project.project.index}
                                id={project.id}
                                stack={project.project.stack}
                          />
                        </Col>
                    ))}
                </Row>
                )}
        </>
    )
}

My Project Component:

import React from 'react'
import { Card, Image } from 'react-bootstrap'
import { Link } from 'react-router-dom'

export const Project = ({ description, features, git, index, link, stack, title, id }) => {
    
    const images = [
        './images/ecom/display.png',
        './images/ytclone/display.png',
        './images/calculator/display.png',
        './images/todo/display.png',
        './images/expense/display.png',
        ' ./images/techS/display.png',
        './images/tictactoe/display.png',
        './images/canvas/display.png',
        './images/linked/display.png'
    ]
    
    return (
        <Card className='py-3 px-5' style={{ height:'100%'}} sm={12}>
            <Image src={images[parseInt(index)]} style={{ width:'100%', border:'0.5px ridge rgb(219,219,219)' }} className='image' />
            <b>{title}</b>
            <div style={{ textAlign:'left' }} className='mb-2' >
                <b>Description:</b>
                {description.map(d=>(
                <li key={description.indexOf(d)}>{d}</li>
            ))}</div>
            <div style={{ textAlign:'left' }} className='mb-2' id='features'>
                <b>Features:</b>
                {features.map(f=>(
                    <li key={features.indexOf(f)}>{f}</li>
                ))}
            </div>
            <div style={{ textAlign:'left' }} className='mb-2' id='stack'>
                <b>Tech Stack:</b>
                {stack.map(s=>(
                    <li key={stack.indexOf(s)}>{s}</li>
                ))}
            </div>
            <div style={{ textAlign:'left' }} className='mb-2' id='git' >
                <b>Git Repo: </b>
                <a href={git.slice(0,5)==='https' ? git : '/projects'} target='_blank'>{git}</a>
            </div>
            <div style={{ textAlign:'left' }} className='mb-2' id='link' >
                <b>Project link: </b>
                <a href={link==='Upcoming' || link==='N/A' ? '/projects' : link}>{link}</a>
            </div>
            <Link to={`/projects/${id}`} className='view'><b>View Project & Project Details</b></Link>
        </Card>
    )
}

App.js:

import './App.css';
import { ContactScreen } from './screens/ContactScreen'
import { ProjectScreen } from './screens/ProjectScreen'
import { Header } from './components/Header'
import { Footer } from './components/Footer'
import { ProjectScreenById } from './screens/ProjectScreenById'
import { BrowserRouter as Router, Route } from 'react-router-dom'

function App() {

  return (
    <div className="App">
      <Header/>
      
      <Router>
  
          <Route path="/contact" component={ContactScreen} exact/>

          <Route path="/projects" component={ProjectScreen} exact />

          <Route path="/projects/:id" component={ProjectScreenById} exact/>

      
      </Router>
      
      <Footer/>
    </div>
  );
}
export default App;

Answer 1

This answer should help you out, but until then, here's a quick hack for it with useLocation :

const location = useLocation()
const ID = location.pathname.split("/projects/")[1]