是什么使我们的Action Creator可以在React中作为道具使用?

时间:2018-07-22 17:30:08

标签: reactjs react-redux

我有此代码:

import React, { Component } from 'react';
import { connect } from 'react-redux';
import { bindActionCreators } from 'redux';
import { fetchWeather } from '../actions/index';

class SearchBar extends Component {
  constructor(props) {
    super(props);

    this.state = { term: '' };

    this.onInputChange = this.onInputChange.bind(this);
    this.onFormSubmit = this.onFormSubmit.bind(this);
  }

  onInputChange(event) {
    this.setState({ term: event.target.value });
  }

  onFormSubmit(event) {
    event.preventDefault();

    this.props.fetchWeather(this.state.term);
    this.setState({ term: '' });
  }

  render() {
    return (
      <form onSubmit={this.onFormSubmit} className="input-group">
        <input
          placeholder="Get a five-day forecast in your favorite cities"
          className="form-control"
          value={this.state.term}
          onChange={this.onInputChange}
        />

        <span className='input-group-btn'>
          <button type="submit" className="btn btn-secondary">
            Submit
          </button>
        </span>
      </form>
    );
  }
}

function mapDispatchToProps(dispatch) {
  return bindActionCreators({ fetchWeather }, dispatch)
}

export default connect(null, mapDispatchToProps)(SearchBar);

在本教程的某一点上,作者说mapDispatchToProps将我们的Action Creator fetchWeather与我们的组件挂钩。但是吗?它不是将动作从我们的动作创建者分发到我们的减速器吗?

实际上是什么使它在我们的组件中以props的形式提供?

1 个答案:

答案 0 :(得分:1)

您可以拥有

const mapDispatchToProps = { fetchWeather };

代替

function mapDispatchToProps(dispatch) {
  return bindActionCreators({ fetchWeather }, dispatch)
}

无论如何,这是使您的动作创建者可以通过this.props使用的功能块。