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[英]How to migrate state passed in React-Router to Redux Store?
[英]How can I maintain my store's state while using react-router and redux?
我正在构建一个本质上模拟电子商务的应用程序原型。 我有组件,每个组件都有可以添加到购物车中的不同项目(下面我只是展示一个基本如何工作的示例)。 使用 react-router 通过不同的路径访问这些组件。 有一个 header 组件显示当前购物车中的商品数量。 header 从 redux 商店中的 state 获取购物车中的商品数量。 但是,如果我导航到新路线,商店将返回默认的 state。 当导航到新路线时,我需要商店保留其 state。 例如,如果我 go 到 ShoppingPage,将商品添加到购物车,然后 go 回到主页,我需要购物车中仍有商品。
动作.js
export const actionTypes = Object.freeze({
UPDATE_CART: Symbol('UPDATE_CART'),
});
export const updateCart = (payload) => {
return {
type: actionTypes.UPDATE_CART,
payload,
};
};
export default actionTypes;
减速器.js
import actions from './actions';
export const INITIAL_STATE = {
cart: [],
};
export default (state = INITIAL_STATE, action) => {
switch (action.type) {
case actions.UPDATE_CART: {
return {
...state,
cart: action.payload,
};
}
default: {
return state;
}
};
};
index.js
import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';
import * as serviceWorker from './serviceWorker';
import { BrowserRouter } from 'react-router-dom';
import { Provider } from 'react-redux';
import { createStore } from 'redux';
import reducer, { INITIAL_STATE } from './reducer';
const store = createStore(reducer, INITIAL_STATE);
console.log(store.getState());
ReactDOM.render(
<Provider store ={store}>
<BrowserRouter>
<App />
</BrowserRouter>
</Provider>
, document.getElementById('root'));
serviceWorker.unregister();
ShoppingPage.js
import React, { Component } from 'react';
import { connect } from 'react-redux';
import { updateCart } from './actions';
class ShoppingPage extends Component {
addToCart = () => {
const cart = [...this.props.cart];
cart.push('new item');
this.props.modifyCart(cart);
render() {
return(
<div>
<button onClick={addToCart}>
Add To Cart
</button>
</div>
)
}
}
const mapDispatchToProps = dispatch => ({
modifyCart: payload => dispatch(updateCart(payload)),
});
const mapStateToProps = state => ({
cart: state.cart,
});
export default connect(
mapStateToProps,
mapDispatchToProps,
)(ShoppingPage);
主页.js
import React, { Component } from 'react';
import { ListGroup, ListGroupItem } from 'reactstrap';
class Home extends Component {
render() {
return(
<div>
<ListGroup>
<ListGroupItem><a href='/ShoppingPage'>ShoppingPage</a></ListGroupItem>
</div>
)
}
}
export default Home;
Header.js
import React, { Component } from 'react';
import { Navbar, NavbarBrand } from 'reactstrap';
import { connect } from 'react-redux';
class Header extends Component {
render() {
return(
<Navbar sticky='top' className='nav'>
<NavbarBrand href='/'>Online Shopping</NavbarBrand>
<span>{'Items in Cart: '}{this.props.cart.length}</span>
</Navbar>
)
}
}
const mapStateToProps = state => ({
cart: state.cart,
});
export default connect(
mapStateToProps
)(Header);
路由.js
import React from 'react';
import { Switch, Route } from 'react-router-dom';
import Home from './Home';
import ShoppingPage from './ShoppingPage';
const Routes = () => (
<Switch>
<Route exact path='/' component={Home} />
<Route exact path='/ShoppingPage' component={ShoppingPage} />
</Switch>
);
export default Routes;
应用程序.js
import React from 'react';
import Routes from './Routes';
import Header from './Header';
function App() {
return (
<div>
<Header />
<Routes />
</div>
);
}
export default App;
可能发生的情况是,在导航期间 web 应用程序再次“重新加载”(正在擦除 redux 状态)。 为了使用反应路由器导航,您需要查看<Link>
。
例如,
主页.js
<a href='/ShoppingPage'>ShoppingPage</a>
应改为:
<Link to="/ShoppingPage">ShoppingPage</Link>
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