[英]React useEffect in async function call data problem, Cannot read properties of undefined error. How can i fixed?
** React useEffect in async function 调用数据问题。 **
无法读取未定义错误的属性。
我该如何解决? 我正在使用 axios 获取数据,但是由于数据迟到,因此在写入 dom 时会引发错误
import React, { useState, useEffect } from "react";
import { useParams, Link } from "react-router-dom";
import axios from "axios";
function CountryDetail() {
const { countryCode } = useParams();
const [country, setCountry] = useState([]);
const getCountry = async () => {
await axios
.get(`https://restcountries.com/v3.1/alpha?codes=${countryCode}`)
.then((res) => setCountry(res.data[0]));
};
useEffect(() => {
getCountry();
}, []);
console.log(country);
return (
<>
<div className="container">
<div className="row ">
<h1 className="text-center mt-4">Country Detail Page</h1>
<div className="col-12">
<img src={country.flags.png} alt={country.flags.png} />
<h2>
{country.name.common} ( {country.cca3} )
</h2>
<h4>Kıta: {country.continents}</h4>
<h5>Başkent: {country.capital[0]}</h5>
<p>Nüfus: {country.population}</p>
</div>
</div>
<div className="row">
<Link to={"/"} className="mt-5 mx-auto col-4 btn btn-info">
Back To Home Page
</Link>
</div>
</div>
</>
);
}
export default CountryDetail;
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