javascript - 从API访问数据并在react中输出

Question

我有一个 API (/js/feed/sms.json)，它返回如下所示的数据:

[
    {
        id: 1,
        name: "Test feeds 1",
        headline: "Here is a headline",
        feed-url: "/something?q=1"
    },
    {
        id: 2,
        name: "Test feeds 2",
        headline: "Here is another headline",
        feed-url: "/something?q=2"
    },
    {
        id: 3,
        name: "Test feeds 3",
        headline: "Here is a third headline",
        feed-url: "/something?q=3"
    }
]

我有几个 React 组件。

第一个是对 API 的调用:fetch-api-data.jsx:

import * as axios from 'axios';

export default class FetchApiData {
  constructor() {
    console.log('FetchAPIData loaded');
  }
  static shareMyStoryData(URL) {
    return axios.get(URL)
    .then(function (response) {
      
    })
    .catch(function (error) {
      console.log(error);
    });
  }
}

第二个是解析数据的组件。

import * as React from 'react';
import * as DOM from 'react-dom';
import PropTypes from 'prop-types';
import axios from 'axios';
import './share-my-story.scss';
import FetchApiData from './fetch-api-data';

class ShareMyStory extends React.Component {

  constructor(props) {
    super(props);
    this.state = {
      smsData: ''
    }
  }

  componentDidMount() {
    const URL = '/js/feed/sms.json';
    FetchApiData
      .shareMyStoryData(URL)
      .then((response) => {
        this.setState({smsData: response });
      })
      .catch((error) => {
        console.log(error);
      });
  }

  render() {
console.log(this.state.smsData);
    return (
      <div>
        <h1>{this.state.smsData.name}<h1>
        <h2>{this.state.smsData.headline}</h2>
        <h3><a href={this.state.smsData.link}>{this.state.smsData.link}</a></h3>
      </div>
    );
  }
}

ShareMyStory.propTypes = {
  name: PropTypes.string,
  headline: PropTypes.string,
  link: PropTypes.string,
  smsData: PropTypes.array
}

DOM.render(
  <ShareMyStory/>, document.getElementById('share-my-story'));

我有两个问题:

首先，我在 this.state.smsData 的 console.log 中未定义。

其次，我需要循环该对象并输出返回中的项目。我来自 Angular，所以我熟悉他们的迭代 ng-repeat，但我在 React 中没有看到类似的工具。有更好的方法来做到这一点吗？

Answer 1

1) 检查哪个先记录，也许当您触发 render() 时您的 fetchData 尚未完成。这就是您获得默认短信数据的原因。

2)为了循环数据，假设 dataArray 是您需要循环的数组

FetchApiData
  .shareMyStoryData(URL)
  .then((response) => {
    // See if this is logging after Render is logged in
    console.log('In FetchApiData: ', this.state.smsData);
    this.setState({smsData: response });
  })

render() {
  console.log('In Render: ', this.state.smsData);

  const listItems = this.state.dataArray.map(function(item) {
    return (
      <li key="{item.name}">
        <a href="{item.link}">{item.name}</a>
      </li>
    );
  });
  return (<ul>{listItems}</ul>);
}