Pokeapi pokemonDetails.map 不是函数且已修复 [模块“"react-router-dom"”没有导出成员 'RouteComponentProps']

Question

我正在使用 React 和 TypeScript 处理 Pokeapi。在获取数据以在一侧显示所有神奇宝贝时，一切正常。但是当点击一个特定的口袋妖怪来显示他们的详细信息时，我得到 2 个错误。

更新：已修复！ #1 错误：我无法使用 {match} 因为模块“react-router-dom”'没有导出成员 'RouteComponentProps'。几个月前，我在一个 ReactJS 项目中使用了它，一切正常。

#2 错误：当 mapping 抛出每个 Pokemon 时，出现错误 pokemonDetails.map is not a function，而在另一个组件中使用 map（在一页上显示所有 Pokemon）时，一切正常。

这是我的 App.js 组件 使用路由器：

import Pokedex from './Pokedex';
import Pokemon from './Pokemon';
import { Route, Routes } from 'react-router-dom';

function App() {
  return (
    <Routes>
      <Route path='/' element={<Pokedex />} />
      <Route path='/pokemon/:id' element={<Pokemon />} />
    </Routes>
  );
}

export default App;

这是我的 Pokedex 组件（在一侧显示所有神奇宝贝）：

import { useEffect, useState } from 'react';
import Container from 'react-bootstrap/Container';
import Col from 'react-bootstrap/Col';
import Row from 'react-bootstrap/Row';

const Pokedex = () => {
  const [pokemon, setPokemon] = useState([]);
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    getPokedex();
  }, []);

  const getPokedex = async () => {
    try {
      const res = await fetch('https://pokeapi.co/api/v2/pokemon?limit=151');
      const { results } = await res.json();
      const pokedex = results.map((pokemon: any, index: number) => {
        const paddedId = ('00' + (index + 1)).slice(-3);
        const image = `https://assets.pokemon.com/assets/cms2/img/pokedex/detail/${paddedId}.png`;
        return { ...pokemon, image };
      });
      setPokemon(pokedex);
      setLoading(false);
    } catch (err) {
      console.error(err);
    }
  };

  return (
    <Container>
      {loading ? (
        'Fetching Pokemon...'
      ) : (
        <Row>
          {pokemon.map((pokemon: any, index: number) => (
            <Col key={index} xs={1} sm={1} md={1} lg={1} xl={1}>
              <a href={`/pokemon/${index + 1}`}>
                <img src={pokemon.image} alt={pokemon.name} />
                <p>
                  {index + 1}.<span>{pokemon.name}</span>
                </p>
              </a>
            </Col>
          ))}
        </Row>
      )}
    </Container>
  );
};

export default Pokedex;

更新：这是 Pokemon 组件（用于显示每个 Pokemon 的详细信息）：

import { useEffect, useState } from 'react';
import Container from 'react-bootstrap/Container';
import { useParams } from 'react-router-dom';

const Pokemon = () => {
  const [pokemonDetails, setPokemonDetails] = useState();
  const [loading, setLoading] = useState(true);

  const { id } = useParams();

  useEffect(() => {
    getPokemon(id);
  }, [id]);

  const getPokemon = async (id: string | undefined) => {
    try {
      const res = await fetch(`https://pokeapi.co/api/v2/pokemon/${id}`);
      const pokemon = await res.json();
      const paddedId = ('00' + id).slice(-3);
      pokemon.image = `https://assets.pokemon.com/assets/cms2/img/pokedex/detail/${paddedId}.png`;
      setPokemonDetails(pokemon);
      setLoading(false);
    } catch (err) {
      console.error(err);
    }
  };

  return (
    <Container>
      <h1>Pokemon</h1>
      {loading ? (
        'Fetching Pokemon...'
      ) : (
        <div>
          <h2>{pokemonDetails.name}</h2>
          <h2>{pokemonDetails.id}</h2>
          <img src={pokemonDetails.image} alt={pokemon.Detailsname} />
          <p>
            {pokemonDetails.types.map((type: any, index: number) => (
              <p key={index}>{type.type.name}</p>
            ))}
          </p>
        </div>
      )}
    </Container>
  );
};

export default Pokemon;

带有“id”的API应该return这个 https://pokeapi.co/api/v2/pokemon/1

这是我的package.json文件，以备不时之需：

  "name": "pokemon",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "@testing-library/jest-dom": "^5.16.0",
    "@testing-library/react": "^11.2.7",
    "@testing-library/user-event": "^12.8.3",
    "@types/jest": "^27.0.3",
    "@types/node": "^16.11.11",
    "@types/react": "^17.0.37",
    "@types/react-dom": "^17.0.11",
    "@types/react-router-dom": "^5.3.2",
    "axios": "^0.24.0",
    "bootstrap": "^5.1.3",
    "react": "^17.0.2",
    "react-bootstrap": "^2.0.3",
    "react-dom": "^17.0.2",
    "react-router-dom": "^6.0.2",
    "react-scripts": "4.0.3",
    "typescript": "^4.5.2",
    "web-vitals": "^1.1.2"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": [
      "react-app",
      "react-app/jest"
    ]
  },
  "browserslist": {
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ],
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ]
  }
}

Answer 1

在 react-router-dom v6 中不再有 route props（即没有 history、location 或 match props) 就像 RRDv5 中的 Route 组件一样。在 v6 中，您应该使用 React 钩子来访问匹配路由的匹配参数。

使用 Link 组件而不是原始锚点 (<a />) 标签 link 到特定的 Pokemon 页面。

import { Link } from 'react-router-dom';

...

{pokemon.map((pokemon: any, index: number) => (
  <Col key={index} xs={1} sm={1} md={1} lg={1} xl={1}>
    <Link to={`/pokemon/${index + 1}`}>
      <img src={pokemon.image} alt={pokemon.name} />
      <p>
        {index + 1}.<span>{pokemon.name}</span>
      </p>
    </Link>
  </Col>
))}

使用 useParams 钩子从路径中获取匹配的 id 匹配参数。

import { useParams } from 'react-router-dom';

const Pokemon = () => {
  const [pokemonDetails, setPokemonDetails] = useState([]);
  const [loading, setLoading] = useState(true);

  const { id } = useParams();

  useEffect(() => {
    getPokemon(id);
  }, [id]);

  const getPokemon = async (id: number) => {
    try {
      const res = await fetch(`https://pokeapi.co/api/v2/pokemon/${id}`);
      const pokemon = await res.json();
      const paddedId = ('00' + id).slice(-3);
      pokemon.image = `https://assets.pokemon.com/assets/cms2/img/pokedex/detail/${paddedId}.png`;
      setPokemonDetails(pokemon);
      setLoading(false);
    } catch (err) {
      console.error(err);
    }
  };

  return (
    ...
  );
};

Answer 2

至于打字稿，我必须将状态类型声明为 any，现在可以抓取了。

const [pokemonDetails, setPokemonDetails] = useState<any>([]);

Pokeapi pokemonDetails.map 不是函数且已修复 [模块“"react-router-dom"”没有导出成员 'RouteComponentProps']

Pokeapi pokemonDetails.map is not a function & FIXED [Module '"react-router-dom"' has no exported member 'RouteComponentProps' ]

match

typescript

reactjs

react-router

pokeapi