使用API​​调用unstated.js初始化容器(React Context API)

时间:2018-09-05 04:47:42

标签: reactjs react-context unstated

我想使用unstated.js(React Context包装器)使用来自api调用的数据来简单地初始化Container状态。

我看到了一个示例,其中用几个变量实例化了容器:

import { Container} from 'unstated';

class WordlistContainer extends Container {

    constructor(...words) {
        super();

        this.state = {
            words: words
        };
    }
}


let wordList = new WordlistContainer('word1', 'word2');
export default wordList;

如果我想获取一些api数据以传递到此Container的状态-这是正确的方法吗?还是应该从父级组件传递道具?这是用于在首次加载数据时将数据加载到SPA中。

2 个答案:

答案 0 :(得分:3)

这最终成功了:

​​import React, { Component } from 'react';
​​import RDOM from 'react-dom';
​​import { Container, Provider, Subscribe } from 'unstated';
​​
​​class ApiContainer extends Container {
​​  state = {
​​    loading: true,
​​    data: null
​​  }
​​  
​​  setApiResponseAsState = async () => {
​​    fetch.('someapi').then(res => res.jsoj()).then( data => this.setState({ data, loading: false });
​​  }
​​}
​​
​​class ApiConsumer extends Component {
​​  async componentDidMount() {
​​    this.props.setApiResponseAsState();
​​  }
​​  
​​  render() {
​​    return <div>{this.props.state}</div>
​​  }
​​}
​​
​​RDOM.render(
​​  <Provider>
​​    <Subscribe to={[ApiContainer]}>
​​      { props => <ApiConsumer {…props} />
​​      }
​​    </Subscribe>
​​  </Provider>
​​  , document.querySelector("#root");
​​)

答案 1 :(得分:2)

直接方法是使用容器的实例。 WordlistContainer的示例实现:

export default class WordlistContainer extends Container {
  fetchWords = async () => {
    const result = await fetch('https://example.com')
    const words = await result.json()
    this.setState({ words })
  }
  // etc... the rest of the container's code
}
// in this and most cases we want a singleton (but other instances can be created)
const wordlistContainer = new WordlistContainer()
export const getWordlistContainerInstance = () => wordlistContainer

然后,将该实例注入提供程序中,例如:

<Provider inject={[getWordlistContainerInstance()]}>

可以通过调用任何地方来触发获取 getWordlistContainerInstance().fetchWords()