How to display all items from an API in React JS?

问题

Below is my code, in this I want to add code to display all the products with its image from an API, how can I do that? Please help?

import React, {useState, useEffect} from 'react'
import "bootstrap/dist/css/bootstrap.min.css"
import Axios from "axios"

function Products() {

const [products, setProducts] = useState({});

const fetchProducts = async () => {
const {data} = await Axios.get('https://api.test.ts/demo/test');  
const products= data
setProducts(products);
};

useEffect(() => {

  fetchProducts()

 }, []);

 return(
     
     <div>
         Want to Display list of products from API
     </div>
 )

}

export default Products;

回答1:

I tried your URL for fetching products but it is showing as not reachable so I have coded this simple app using https://jsonplaceholder.typicode.com API of the list of todos.

Hope this example helps you understand how to fetch and display items from fetched data.

import React, { useState, useEffect } from "react";
import "./styles.css";
import Axios from "axios";

function App() {
  const [products, setProducts] = useState([]);

  const fetchProducts = async () => {
    const { data } = await Axios.get(
      "https://jsonplaceholder.typicode.com/todos/"
    );
    const products = data;
    setProducts(products);
    console.log(products);
  };

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

  return (
    <div>
      {products.map((product) => (
        <p key={product.id}>{product.title}</p>
      ))}
    </div>
  );
}

export default App;

CodeScandbox Link

Here is another example, where the returned data is in the form of an object instead of an array in the above Example:

import React, { useState, useEffect } from "react";
import "./styles.css";
import Axios from "axios";

const productsData = {
  note: "",
  notification: "",
  Books: [
    {
      bookID: 65342,
      img: "https://source.unsplash.com/200x300/?book",
      year: 2018,
      bookTitle: "Story Time",
      LibraryInfo: {
        Status: "Out",
        returnDate: "7 Jan"
      }
    },
    {
      bookID: 65332,
      img: "https://source.unsplash.com/200x300/?book",
      year: 2018,
      bookTitle: "Story Time",
      LibraryInfo: {
        Status: "Out",
        returnDate: "7 Jan"
      }
    }
  ]
};
export default function App() {
  const [products, setData] = useState(productsData);
  const [toggle, setToggle] = useState({});
  useEffect(() => {
    setData({});
    Axios.get("https://stylmate1.firebaseio.com/hair.json").then((response) => {
      // console.log(response.data);
      setData(productsData);
    });
  }, [toggle]);
  return (
    <div className="App">
      {/* <button onClick={() => setToggle(!toggle)}>fetch</button> */}
      {products?.["Books"]?.length &&
        products["Books"].map((product) => (
          <div key={Math.random() * 10000}>
            <img src={product.img} width="200" alt="" />
            <p>{product.bookTitle}</p>
            <p>{product.year}</p>
            <p>
              {"Library Status: " +
                product.LibraryInfo.Status +
                "\n" +
                product.LibraryInfo.returnDate}
            </p>
            <p></p>
          </div>
        ))}
    </div>
  );
}

Here is the Codesandbox Example Showing how to Render elements from JSON data returned in the form of the object instead of Array Like the above example

回答2:

   return (
     <div>
       {products.map((product, index) => (
        <p key={index}>{product.title}</p>
       ))}
     </div>
   );
 

It's recommended to have a product id, instead of using the array index as a key prop.

   return (
     <div>
       {products.map(({ id, title }) => (
        <p key={id}>{title}</p>
       ))}
     </div>
   );

That 'key' prop helps React detect & change the modified items using their unique 'key' prop.

来源：https://stackoverflow.com/questions/65080448/how-to-display-all-items-from-an-api-in-react-js