从reactjs中的api加载dropdownlist数据

import React, { Component } from 'react';

class DropdownList extends Component {
  constructor(props) {
    super(props);
    this.state = {
      data: [], // 存储下拉列表数据的状态
      isLoading: true // 用于显示加载状态的标志
    };
  }

  componentDidMount() {
    // 发起异步请求获取数据
    fetch('https://api.example.com/dropdownlist')
      .then(response => response.json())
      .then(data => {
        this.setState({ data: data, isLoading: false }); // 更新组件状态
      })
      .catch(error => {
        console.error('Error fetching dropdownlist data:', error);
        this.setState({ isLoading: false });
      });
  }

  render() {
    const { data, isLoading } = this.state;

    if (isLoading) {
      return <div>Loading...</div>;
    }

    return (
      <select>
        {data.map(item => (
          <option key={item.id} value={item.value}>{item.label}</option>
        ))}
      </select>
    );
  }
}

export default DropdownList;