使用 API 在 React-Table 中创建数据

Question

我对 React.js 非常陌生，我想在这里使用这个 api：https://covidtracking.com/api/v1/states/current.json 来创建一个表格，其中包含来自美国各州的最新 COVID-19 数据。问题是，当我渲染应用程序时，我似乎无法将数据上传到表中。任何帮助将不胜感激，谢谢。

import React, { useMemo, useState, useEffect } from "react";
import axios from "axios";
import Table from "./Table";
import "./App.css";

function App() {
  
  const [loadingData, setLoadingData] = useState(true);
  const columns = useMemo(() => [
    {
      Header: "State",
      accessor: "show.state",
    },
    {
      Header: "Positive Cases",
      accessor: "show.positive",
    },
    {
      Header: "Recovered Cases",
      accessor: "show.recovered",
      

    },
    {
      Header: "Deaths",
      accessor: "show.death",
    },
    {
      Header: "Total Tested",
      accessor: "show.total",
    }
  
  ]);

  const [data, setData] = useState([]);

  useEffect(() => {
    async function getData() {
      await axios
        (.get("https://covidtracking.com/api/v1/states/current.json")
        .then((response)) => {
      
          console.log(response.data);
          setData(response.data);
          setLoadingData(false);
        });
    }
    if (loadingData) {
      getData();
    }
  }, []);

  return (
    <div className="App">
      {loadingData ? (
      ) : (
        <Table columns={columns} data={data} />
      )}
    </div>
  );
}

export default App;

Answer 1

import React, { useMemo, useState, useEffect } from "react";
import axios from "axios";
import Table from "./Table";
import "./App.css";

function App() {
  // here you set a state to tell the component it need to wait
  //  until the result is fetched from the api
  const [loadingData, setLoadingData] = useState(true);
  const columns = useMemo(() => [
    {
      Header: "State",
      accessor: "state",
    },
    {
      Header: "Positive Cases",
      accessor: "positive",
    },
    {
      Header: "Recovered Cases",
      accessor: "recovered",
    },
  ]);

  const [data, setData] = useState([]);

  useEffect(() => {
    async function getData() {
      await axios
        .get("https://covidtracking.com/api/v1/states/current.json")
        .then((response) => {
          // check if the data is populated
          console.log(response.data);
          setData(response.data);
          // you tell it that you had the result
          setLoadingData(false);
        });
    }
    if (loadingData) {
      // if the result is not ready so you make the axios call
      getData();
    }
  }, []);

  return (
    <div className="App">
      {/* here you check if the state is loading otherwise if you wioll not call that you will get a blank page because the data is an empty array at the moment of mounting */}
      {loadingData ? (
        <p>Loading Please wait...</p>
      ) : (
        <Table columns={columns} data={data} />
      )}
    </div>
  );
}

export default App;