Javascript 如何设置React Redux应用程序在我的Reducer中返回的内容?
我正在React环境中设置Redux,以便能够在组件之间移动用户选择数据。我希望能够获取在我的Javascript 如何设置React Redux应用程序在我的Reducer中返回的内容?,javascript,reactjs,redux,react-redux,Javascript,Reactjs,Redux,React Redux,我正在React环境中设置Redux,以便能够在组件之间移动用户选择数据。我希望能够获取在我的Webshop.js文件中找到的cart值: import React, { Component } from 'react'; import{ Connect } from 'react-redux'; import Shirt from './shirt.jpg'; export default class addCart extends Component { constructor
Webshop.js
文件中找到的cart
值:
import React, { Component } from 'react';
import{ Connect } from 'react-redux';
import Shirt from './shirt.jpg';
export default class addCart extends Component {
constructor(){
super();
this.state = {value: 'medium'}
this.handleClick = this.handleClick.bind(this);
this.change = this.change.bind(this);
}
handleClick() {
let cart = {price:0,item:"userselection",size:this.state.value};
console.log(cart);
}
change(e){
this.setState({value: e.target.value})
}
itemSelection(){
let userOrder = {price:0,item:"",size:""};
let userItem = "";
if (userItem == "shirt1") {
let itemPrice = 20.00;
}
}
render() {
return (
<div className='Webshop' id='Webshop'>
<li id="Productlist">
<div className='Product'>
<img src={Shirt}></img>
<button onClick={this.handleClick} className="addit">Add to cart</button>
<select id="size" onChange={this.change} value={this.state.value}>
<option value="medium">Medium</option>
<option value="large">Large</option>
<option value="x-large">X-large</option>
</select>
</div>
<div className='Product'>
<img src={Shirt}></img>
<button onClick={this.handleClick} className="addit">Add to cart</button>
<select id="size" onChange={this.change} value={this.state.value}>
<option value="medium">Medium</option>
<option value="large">Large</option>
<option value="x-large">X-large</option>
</select>
</div>
</li>
</div>
);
}
}
这是我的actions.js
:
import { createStore, applyMiddleware } from 'redux';
import reducer from './reducers';
import thunkMiddleware from 'redux-thunk';
import {createLogger} from 'redux-logger';
var initialState = {
data: [],
url: "/api/comments",
pollInterval: 2000
}
const store = createStore(
reducer,
applyMiddleware(
createLogger(),
thunkMiddleware
)
);
export default store;
export const ADD_CART = 'ADD_CART';
export function addCart(){
return {
type: ADD_CART,
payload: item
}
};
import {ADD_CART} from './actions';
export default reducer;
function rootReducer(state, action){
switch(action.type)
case ADD_CART:
return
}
import React from 'react';
import ReactDOM from 'react-dom';
import { Router, Route, IndexRoute, hashHistory } from 'react-router';
import {Provider} from 'react-redux';
import store from '../store';
import App from 'views/App';
import Home from 'views/Home';
import Webshop from 'views/webshop';
import Cart from 'views/webcart';
ReactDOM.render(
<Router history={ hashHistory }>
<Provider store={store}>
<Route path='/' component={ App }>
<IndexRoute component={ Home } />
<Route path='Webshop' component={ Webshop } />
<Route path='Cart' component={ Cart } />
</Route>
</Provider>
</Router>,
document.getElementById('app') // eslint-disable-line
);
还有我的reducers.js
:
import { createStore, applyMiddleware } from 'redux';
import reducer from './reducers';
import thunkMiddleware from 'redux-thunk';
import {createLogger} from 'redux-logger';
var initialState = {
data: [],
url: "/api/comments",
pollInterval: 2000
}
const store = createStore(
reducer,
applyMiddleware(
createLogger(),
thunkMiddleware
)
);
export default store;
export const ADD_CART = 'ADD_CART';
export function addCart(){
return {
type: ADD_CART,
payload: item
}
};
import {ADD_CART} from './actions';
export default reducer;
function rootReducer(state, action){
switch(action.type)
case ADD_CART:
return
}
import React from 'react';
import ReactDOM from 'react-dom';
import { Router, Route, IndexRoute, hashHistory } from 'react-router';
import {Provider} from 'react-redux';
import store from '../store';
import App from 'views/App';
import Home from 'views/Home';
import Webshop from 'views/webshop';
import Cart from 'views/webcart';
ReactDOM.render(
<Router history={ hashHistory }>
<Provider store={store}>
<Route path='/' component={ App }>
<IndexRoute component={ Home } />
<Route path='Webshop' component={ Webshop } />
<Route path='Cart' component={ Cart } />
</Route>
</Provider>
</Router>,
document.getElementById('app') // eslint-disable-line
);
为了将我的商店链接到我的组件,我将我的所有组件包装在我的app.js
中的
标记中:
import { createStore, applyMiddleware } from 'redux';
import reducer from './reducers';
import thunkMiddleware from 'redux-thunk';
import {createLogger} from 'redux-logger';
var initialState = {
data: [],
url: "/api/comments",
pollInterval: 2000
}
const store = createStore(
reducer,
applyMiddleware(
createLogger(),
thunkMiddleware
)
);
export default store;
export const ADD_CART = 'ADD_CART';
export function addCart(){
return {
type: ADD_CART,
payload: item
}
};
import {ADD_CART} from './actions';
export default reducer;
function rootReducer(state, action){
switch(action.type)
case ADD_CART:
return
}
import React from 'react';
import ReactDOM from 'react-dom';
import { Router, Route, IndexRoute, hashHistory } from 'react-router';
import {Provider} from 'react-redux';
import store from '../store';
import App from 'views/App';
import Home from 'views/Home';
import Webshop from 'views/webshop';
import Cart from 'views/webcart';
ReactDOM.render(
<Router history={ hashHistory }>
<Provider store={store}>
<Route path='/' component={ App }>
<IndexRoute component={ Home } />
<Route path='Webshop' component={ Webshop } />
<Route path='Cart' component={ Cart } />
</Route>
</Provider>
</Router>,
document.getElementById('app') // eslint-disable-line
);
从“React”导入React;
从“react dom”导入react dom;
从“react Router”导入{Router,Route,IndexRoute,hashHistory};
从'react redux'导入{Provider};
从“../store”导入存储;
从“视图/应用程序”导入应用程序;
从“视图/主视图”导入主视图;
从“视图/Webshop”导入Webshop;
从“视图/网络艺术”导入购物车;
ReactDOM.render(
,
document.getElementById('app')//eslint禁用行
);
如何设置reducer中返回的内容,以便将
cart
传递给我的应用程序中的其他组件?使用'react redux'中的Connect
连接addCart
组件,并为其提供onCartAdd
道具,以将addCart
操作发送到您的商店
import React, { Component } from 'react';
import { addCart } from './actions';
import { connect } from 'react-redux';
import Shirt from './shirt.jpg';
class WebShop extends Component {
...
handleClick() {
let cart = {price:0,item:"userselection",size:this.state.value};
this.props.onCartAdd(cart);
}
...
}
const mapDispatchToProps = (dispatch) => {
return {
onCartAdd: (cart) => {
dispatch(addCart(cart));
},
}
}
export deafult connect(null, mapDispatchToProps)(WebShop);
“actions.js”中的addCart
需要将item
作为参数:
export const ADD_CART = 'ADD_CART';
export function addCart(iten){
return {
type: ADD_CART,
payload: item
}
};
更详细地说明如何自定义
mapDispatchToProps
将由多个组件使用的应用程序数据应添加到存储中。然后,您可以使用connect
从任何组件访问此数据
如果您希望其他组件访问购物车
,则应将其添加到您的商店中
i、 e
然后,您可以使用connect
在任何组件中使用此值
在根减缩器中,在分派操作时更改此值
import {ADD_CART} from './actions';
export default reducer;
function rootReducer(state, action){
switch(action.type)
case ADD_CART:
return {
...state,
cart: action.payload
}
}
你的还原程序应该(通常)返回另一个state对象。这就是我在应用于代码时遇到的问题。我应该如何使用state来获取我想要的数据@OliverCharlesworth我收到一个错误模块构建失败:重复声明“addCart”
,我假设这是因为我的操作函数和处理单击的函数具有相同的名称。另外,我是否需要此方法的reducers文件?那么我返回的值是多少?通过添加别名修复了该错误。.但是我得到了此错误未捕获错误:预期reducer是一个函数。
因为我的reducer函数不返回任何东西。.我理解在您的示例中const-mapsdispatchtoprops=(dispatch)=>{
用作我的reducer,因此我删除了我的reducers.js
文件。现在我得到了以下错误:app.js:831未捕获错误:在“Connect(addCart)”的上下文或道具中找不到“store”。请将根组件包装在中,或者将“store”作为道具显式传递给“Connect(addCart)”。
“我知道在您的示例中,const-mapDispatchToProps=(dispatch)=>{
用作我的reducer,因此我删除了reducers.js文件。“这是不正确的;您仍然需要一个reducer。reducer接收操作并将必要的修改返回到您的存储。我修改了代码以调用类WebShop
,并将其传递给connect
。