如何通过redux-thunk中的fetching操作访问状态？

debugcn 发表于 Dev

sam1024

我是新来的反应。在我的React应用程序中，我有一个列出所有产品项的产品组件。在fetch function从服务器上被处理redux-thunk。但我无法访问state组件中的，请'products'始终注意变量-is undefined。这是获取数据的正确方法吗？

在我Products.js，

import Spinner from '../../components/Spinner/Spinner';
import { connect } from 'react-redux';
import { GetProductDataAction } from '../../redux/Product/Product.actions';

class Products extends React.Component {
    constructor(props) {
        super(props);

        this.state = {
            loading: true,
            products: [],
        }
    }

    async componentDidMount() {
        const product = await this.props.getProductsData();

        this.setState({
            products: this.state.product,
            loading: false
        })
    }

    render() {
        const { product } = this.state;
        return (
            <>
                {
                    this.state.loading || !this.state.products ?
                        <Spinner />
                        :
                            <section className="products-overview-container">
                                    <div className="product-container">
                                        {
                                            products.map(({ ...otherProps }) => {
                                                return <Product key={otherProps._id} 
                                               {...otherProps} />
                                            })
                                        }
                                    </div>
                            </section>
                }

            </>
        );
    }
}

const mapStateToProps = (state) => ({
    products: state.product,
});

const mapDispatchToProps = (dispatch) => {
    return {
        getProductsData: () => {
            dispatch(GetProductDataAction());
        },
    };
};

export default connect(
    mapStateToProps,
    mapDispatchToProps
)(Products);

在我的Product.action.jsx中，

import axios from "axios";
import ProductActionTypes from './Product.types';

export const GetProductDataAction = () => {
    return async (dispatch) => {
        try {
            const res = await axios.get("http://127.0.0.1:3000/products");
            const { data } = res;
            dispatch({
                type: ProductActionTypes.GET_PRODUCT_DATA_SUCCESS,
                payload: data
            });
            console.log('Getting Tour Data Successfully');
        } catch (error) {
            // error code
        }
    };
};

塔吉·哈瓦里（Taghi Khavari）

这是您需要进行的更改：

class Products extends React.Component {
  constructor(props) {
    super(props);

    this.state = {
      loading: true,
      products: []
    };
  }

  async componentDidMount() {
    const products = await this.props.getProductsData();

    this.setState({
      products,
      loading: false
    });
  }

  render() {
    const { products } = this.state;
    return (
      <>
        {this.state.loading || !this.state.products ? (
          <Spinner />
        ) : (
          <section className="products-overview-container">
            <div className="product-container">
              {products.length && products.map(({ ...otherProps }) => {
                return <Product key={otherProps._id} {...otherProps} />;
              })}
            </div>
          </section>
        )}
      </>
    );
  }
}

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