Redux操作“ FETCH_PRODUCTS”未触发

如何解决Redux操作“ FETCH_PRODUCTS”未触发

“我的产品”组件通过映射的道具和调度连接到状态。从Products.js调用fetchProducts（）应该调度“ FETCH_PRODUCTS”操作（和console.log（“由产品操作触发”）并将数据作为有效载荷发送到Product Reducer），这反过来又会增加从中获取的数据（产品）声明“ data.json”（也应该声明为console.log（“从products reducer发射”）），这又被假定为通过props.products或products将其提供给Products组件。来自Products.js的Console.logging（fetchProducts（））记录其功能定义，该功能定义位于productActions.js中，我相信这是问题所在。

console.log（fetchProducts（））

dispatch => {
  console.log('Fired from product actions');
  dispatch({
    type: _components_types__WEBPACK_IMPORTED_MODULE_0__["FETCH_PRODUCTS"],payload: data
  });
}

Products.js

import React,{ useState,useEffect } from "react";
import { Fade,Zoom } from "react-reveal";
import Modal from "react-modal";
import { connect } from "react-redux";
import fetchProducts from "../actions/productActions";

const Products = ({ props,products,add }) => {
  const [product,setProduct] = useState(null);
  const openModal = (product) => {
    setProduct(product);
  };

  const closeModal = () => {
    setProduct(null);
  };

  fetchProducts()
  useEffect(() => {
    
  },[]);

  const renderProducts = () => {
    return products.map((product) => {
      return (
        <li key={product._id}>
          <a href={"#" + product._id} onClick={() => openModal(product)}>
            <img src={product.image} />
          </a>

          <p>
            <a href="#">{product.title}</a>
          </p>
          <p>
            <strong>${product.price}.00</strong>
          </p>
          <button onClick={() => add(product)}>ADD TO CART</button>
        </li>
      );
    });
  };

  return (
    <div>
      <Fade bottom cascade>
        <ul>{!products ? <div>Loading...</div> : renderProducts()}</ul>
      </Fade>
      {product && (
        <Modal isOpen={true}>
          <Zoom clear cascade>
            <div>
              <p onClick={() => closeModal()}>X CLOSE</p>
              <img src={product.image} />
            </div>
            <div>
              <p>{product.title}</p>
              <p>${product.price}.00</p>
              Sizes
              <p>
                Available Sizes
                {product.availableSizes.map((size) => {
                  return (
                    <>
                      <br />
                      <span> {size} </span>
                    </>
                  );
                })}
              </p>
              <button
                onClick={() => {
                  add(product);
                  closeModal();
                }}
              >
                ADD TO CART
              </button>
            </div>
          </Zoom>
        </Modal>
      )}
    </div>
  );
};

const mapStateToProps = state => {
    return {
        products: state.products.items
    }
}

const mapDispatchToProps = () => {
    return{
        fetchProducts
    }
}
export default connect(mapStateToProps,mapDispatchToProps())(Products);

productActions.js

import { FETCH_PRODUCTS } from "../components/types";
const data = require('../data.json')
const fetchProducts = () => (dispatch) => {
    console.log('Fired from product actions')
    dispatch({
        type: FETCH_PRODUCTS,payload: data    
    })
}

export default fetchProducts

productReducer.js

const { FETCH_PRODUCTS } = require("../components/types");

const productsReducer = (state = {},action) =>{
    switch(action.type){
        case FETCH_PRODUCTS:
            console.log('Fired from product reducers')
            return {items: action.payload}
            default:
                return state;
    }
}
export default productsReducer;

store.js

import {createStore,applyMiddleware,compose,combineReducers } from "redux";
import thunk from "redux-thunk";
import productsReducer from "./reducers/productReducers";

const initialState = {};
const composeEnhancer = window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__ || compose;
const store = createStore(combineReducers({
    products: productsReducer,}),initialState,composeEnhancer(applyMiddleware(thunk))
)

export default store;

data.json

{
  "products": [
    {
      "_id": "dress1","image": "/images/dress1.jpeg","title": "Dress 1","description": "about dress 1","availableSizes": ["S","M","L","XL"],"price": 30.0
    },{
      "_id": "dress2","image": "/images/dress2.jpeg","title": "Dress 2","description": "about dress 2","price": 50.0
    },{
        "_id": "dress3","image": "/images/dress3.jpeg","title": "Dress 3","description": "about dress 3","XL","M"],"price": 10.0
      },{
        "_id": "dress4","image": "/images/dress4.jpeg","title": "Dress 4","description": "about dress 4","XXL"],"price": 150.0
      },{
        "_id": "dress5","image": "/images/dress5.jpeg","title": "Dress 5","description": "about dress 5","availableSizes": ["M","price": 75.0
      },{
        "_id": "dress6","image": "/images/dress6.jpeg","title": "Dress 6","description": "about dress 6","price": 75.0
      }
  ]
}

App.js

import React,{ useEffect,useState } from "react";
import data from "./data.json";
import Products from "./components/Products";
import Filter from "./components/Filter";
import Cart from "./components/Cart";
import store from "./store";
import { Provider } from "react-redux";

const App = () => {
  const [products,setProducts] = useState(data.products);
  const [size,setSize] = useState("");
  const [sort,setSort] = useState("");
  const [cartItems,setCartItems] = useState([]);

  useEffect(() => {},[products]);
    // console.log(fetch('data/data.json').then(response => response.text())
    // .then(data => console.log(data)))
    
  const addtoCart = (product) => {
    const items = cartItems.slice();
    let alreadyInCart = false;
    items.forEach((element) => {
      if (element._id === product._id) {
        element.count++;
        alreadyInCart = true;
      }
    });
    if (!alreadyInCart) {
      items.push({ ...product,count: 1 });
    }
    setCartItems(items);
    //   localStorage.setItem("cartItems",JSON.stringify(items))
  };

  const removeFromCart = (item) => {
    const items = cartItems.slice();
    setCartItems(items.filter((elem) => elem._id !== item._id));
  };
  const sortProducts = (e) => {
    const sort = e.target.value;
    setSort(sort);
    setProducts(
      products
        .slice()
        .sort((a,b) =>
          sort === "lowest"
            ? a.price < b.price
              ? 1
              : -1
            : sort === "highest"
            ? a.price > b.price
              ? 1
              : -1
            : a._id < b._id
            ? 1
            : -1
        )
    );
  };

  const createOrder = (order) => {
    alert('Click "OK" to confirm order!',order);
  };

  const filterProducts = (e) => {
    if (e.target.value === "") {
      setProducts(data.products);
      setSize(e.target.value);
    } else {
      setSize(e.target.value);
      setProducts(
        data.products.filter(
          (product) => product.availableSizes.indexOf(e.target.value) >= 0
        )
      );
    }
  };

  return (
    <>
      <Provider store={store}>
        <header>
          <a href="/">React Cart</a>
        </header>
        <Filter
          size={size}
          filter={filterProducts}
          sort={sortProducts}
          count={data.products.length}
        />
        <hr />
        <main>
          <Products add={addtoCart} />
          <hr />
          <div>
            <Cart
              createOrder={createOrder}
              remove={removeFromCart}
              cartItems={cartItems}
            />
          </div>
        </main>
        <hr />
        <footer>Footer</footer>
      </Provider>
    </>
  );
};

export default App;