我正在建立一个网上商店,但遇到了一些问题。当我点击购买按钮时,我希望发生三件事:
- 将产品添加到 redux 状态 (shoppingcartReducer)
- 更新 redux 状态下的总和和数量 (shoppingcartReducer)
- 渲染出我的 shoppingCart.js 中的总和和数量 组件
问题出在 ShoppingcartReducer 上。我不知道如何在一个操作中更新两个不同路径中的状态。
return state
.setIn(['products', action.articleNr], addArticle(action, state))
这里我位于“products/articleNr”路径中并操作数据,但我还想更新“./”中的总和和数量。
所以我想到的替代方案可能是在 ShoppingcartActions 中添加某种中间件,但我真的不知道这是否正确,也不知道该怎么做!
感谢所有的帮助,谢谢!
购物车 reducer :
import Immutable from 'seamless-immutable'
import { addToShoppingcart, createShoppingCart } from '../actions/shoppingcartActions'
const ADD_TO_SHOPPINGCART = 'ADD_TO_SHOPPINGCART'
const CREATE_SHOPPING_CART = 'CREATE_SHOPPING_CART'
const initialState = Immutable({
sum: 0,
quantity: 0
})
export default function shoppingcartReducer(state = initialState, action) {
switch (action.type) {
case ADD_TO_SHOPPINGCART:
return state
.setIn(['products', action.articleNr], addArticle(action, state))
case CREATE_SHOPPING_CART:
return state
.set(action.id, createCart(action))
}
return state
}
function addArticle(action, state) {
return {
product: action.product
}
}
function createCart(action) {
return {
id: action.id,
}
}
购物车操作:
let nextTodoId = 0
const ADD_TO_SHOPPINGCART = 'ADD_TO_SHOPPINGCART'
const CREATE_SHOPPING_CART = 'CREATE_SHOPPING_CART'
export function addToShoppingcart(product) {
return {
type: ADD_TO_SHOPPINGCART,
articleNr: product.articleNr,
product: product,
}
}
export function createShoppingCart() {
return {
type: CREATE_SHOPPING_CART,
id: 'productNr:'+nextTodoId++,
}
}
ShoppingCart.js:
import React, { Component } from 'react'
import { bindActionCreators } from 'redux'
import { connect } from 'react-redux'
import * as shoppingcartActions from '../../actions/shoppingcartActions'
class ShoppingCart extends Component {
componentWillMount() {
this.state = {
shoppingcartReducer: []
}
}
componentWillReceiveProps(nextProps) {
this.setState({
shoppingcartReducer: nextProps.shoppingcartReducer ? nextProps.shoppingcartReducer : ''
})
}
render() {
const { shoppingcartReducer } = this.props
const { sum, quantity } = shoppingcartReducer
return (
<div className="shoppingCart">
<ul>
<li>Summa: {sum} :-</li>
<li>Antal varor: {quantity}</li>
</ul>
</div>
)
}
}
function mapStateToProps(state) {
return {
shoppingcartReducer: state.shoppingcartReducer
}
}
function mapDispatchToProps(dispatch) {
return bindActionCreators(shoppingcartActions, dispatch)
}
export default connect(mapStateToProps, mapDispatchToProps)(ShoppingCart)
最佳答案
这成功了!
export function addProduct(product) {
return {
type: ADD_PRODUCT,
articleNr: product.articleNr,
product: product,
}
}
export function addSummary(product) {
return {
type: ADD_SUMMARY,
product: product
}
}
export function addToShoppingcart(product) {
return (dispatch) => {
dispatch( addProduct(product))
dispatch( addSummary(product))
}
}
关于reactjs - 通过一个操作在两个地方更新 redux 状态,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/39785832/