在 react.js 的一个组件中映射来自不同 API 的数据？

Question

I'm working on a challenge. My task is to use two APIS: https://api.thecatapi.com/v1/images/search?breed_id=abys and https://api.thecatapi.com/v1/breeds

to display image and description. So far I've got:

 import React, { Component } from 'react' import ReactDOM from 'react-dom' import axios from 'axios' const Cat = ({ cat: { name, weight, life_span, description } }, { image: url }) => { return ( <div className='cat'> <div className='cat_wrapper'> <img src={url} alt="catimage" /> </div> <h3 className='cat_breed'>{name.toUpperCase()}</h3> <div className='country_text'> <span>Weight:{weight.metric}</span> <span>Lifespan: {life_span}</span> <div>Description: {description}</div> </div> </div> ) } class App extends Component { state = { data: [], data2: [] } componentDidMount() { this.fetchCatData() } fetchCatData = async () => { const url = 'https://api.thecatapi.com/v1/breeds' const images = 'https://api.thecatapi.com/v1/images/search?breed_id=abys' try { const response = await axios.get(url) const response2 = await axios.get(images) const data = await response.data const data2 = await response2.data2 this.setState({ data, data2 }) } catch (error) { console.log(error) } } render() { return ( <div className='App'> <div> <p>There are {this.state.data.length} cats in the api</p> <div className='wrapper'> {this.state.data.map((cat, image) => ( <Cat image={this.state.data2.image} cat={cat} key={cat.id} /> ))} </div> </div> </div> ) } } const rootElement = document.getElementById('root') ReactDOM.render(<App />, rootElement)

But it returns an error

× TypeError: Cannot read property 'image' of undefined

How to fix it?

-=EDITED=-

so, now it reads the 'url' key, earlier it was undefined . I managed to display a hardcoded image of a cat, now I wonder how to map all the different images to its proper contents.

 import React, { Component } from 'react' import ReactDOM from 'react-dom' import axios from 'axios' const Cat = ({ cat: { name, weight, life_span, description, url }}) => { return ( <div className='cat'> <div className='cat_wrapper'> <img alt="catimage" src={url} width="50" height="30"/> </div> <h3 className='cat_breed'>{name.toUpperCase()}</h3> <div className='country_text'> <span>Weight:{weight.metric}</span> <span>Lifespan: {life_span}</span> <div>Description: {description}</div> </div> </div> ) } class App extends Component { state = { data: [], data2: [] } componentDidMount() { this.fetchCatData() } fetchCatData = async () => { const url = 'https://api.thecatapi.com/v1/breeds' const images = 'https://api.thecatapi.com/v1/images/search?breed_id=abys' try { const response = await axios.get(url) const response2 = await axios.get(images) const data = await response.data const data2 = await response2.data this.setState({ data, data2 }) } catch (error) { console.log(error) } } render() { return ( <div className='App'> <div> <p>There are {this.state.data.length} cats in the api</p> <div className='wrapper'> {this.state.data.map((cat) => { cat.url = this.state.data2[0].url; return <Cat cat={cat} key={cat.id}/> } )} </div> </div> </div> ) } } const rootElement = document.getElementById('root') ReactDOM.render(<App />, rootElement)

Answer 1

you better first fetch all data cats then, for each cat make a request to fetch its correspondent image for that cat and add an image or url attribute like:

  fetchCatData = async () => {
    const catsDataUrl = 'https://api.thecatapi.com/v1/breeds'
    const searchImgUrl = 'https://api.thecatapi.com/v1/images/search?breed_id='
    try {
      const catsResponse = await axios.get(catsDataUrl)
      const cats = catsResponse.data
      
      await Promise.allSettled(cats.map(async (cat) => {
        const response = await axios.get(`${searchImgUrl}${cat.id}`)
        cat.url = response.data[0].url // data is an array with a single object        
      }))

      this.setState({cats}) // I changed state name for cats to be more semantic
      
    } catch (error) {
      console.log(error)
    }
  }

now you don't need data2, you already have url. fwiw, your error is given the fact that data2 is an array and not an object with image attribute.