[英]redux don't show props on another page
我所有頁面都有導航欄。 我想在其中放入購物車,但是,當我轉到內部產品頁面時,不會顯示我傳送的道具。
為什么會這樣呢? 我認為這是我的問題, React Router v4無法與Redux一起使用,但是我如何實現呢? 你怎么看 ?
App.js
import React, {Component} from 'react';
import {Container} from 'reactstrap';
import {
BrowserRouter,
Route,
Switch
} from "react-router-dom";
import './App.css';
import NavbarMenu from './components/navbar'
import Main from './components/main';
import Good from './components/good';
class App extends Component {
render() {
return (
<BrowserRouter>
<div className="App">
<NavbarMenu/>
<Container>
<Switch>
<Route path="/" exact component={Main}/>
<Route path="/good/:id" component={Good}/>
</Switch>
</Container>
</div>
</BrowserRouter>
);
}
}
export default App;
導航欄
import React from 'react';
import {
Collapse,
Navbar,
NavbarToggler,
NavbarBrand,
Nav,
UncontrolledDropdown,
DropdownToggle,
DropdownMenu,
DropdownItem,
Button
} from 'reactstrap';
import {withRouter} from 'react-router-dom';
import connect from 'react-redux/es/connect/connect';
import {getCart} from '../../redux/actions/cartAction';
class NavbarMenu extends React.Component {
constructor(props) {
super(props);
this.toggle = this.toggle.bind(this);
this.state = {
isOpen: false
};
}
toggle() {
this.setState({
isOpen: !this.state.isOpen
});
}
render() {
console.log(this.props)
const cartLength = this.props.cart.length;
const cartItems = this.props.cart.map(e => {
return <div key={e.id} style={{marginBottom: '20px'}}>
<DropdownItem
style={{display: 'inline-block', width: 'auto'}}
onClick={() => {
this.props.history.push('/good/' + e.id)
}}>
{e.name}
</DropdownItem>
<Button
style={{display: 'inline-block', float: 'right', marginRight: '20px'}}
color="danger"
>X</Button>
</div>
});
return (
<Navbar
color="light"
light expand="md"
style={{marginBottom: '20px'}}
>
<NavbarBrand
style={{cursor: 'pointer'}}
onClick={() => {
this.props.history.push('/')
}}
>
Shop
</NavbarBrand>
<NavbarToggler onClick={this.toggle}/>
<Collapse isOpen={this.state.isOpen} navbar>
<Nav className="ml-auto" navbar>
<UncontrolledDropdown nav inNavbar>
<DropdownToggle nav caret>
Cart: {cartLength} items
</DropdownToggle>
<DropdownMenu right style={{width: '300px'}}>
{cartItems}
<DropdownItem divider/>
</DropdownMenu>
</UncontrolledDropdown>
</Nav>
</Collapse>
</Navbar>
);
}
}
const mapStateToProps = state => ({
cart: state.cart.cart
});
export default withRouter(connect(mapStateToProps, {getCart})(NavbarMenu));
根據您提供的打印件,您正在另一個窗口上打開該項目,因此,該窗口中的會話變量不會被傳遞。
您可以使用的一種解決方案是將您以后需要使用的商店存儲在瀏覽器的localStorage中。
您可以通過使用Redux訂閱功能來做到這一點。
例如:
localStorage.js
export const loadState = () => {
try {
const serializedState = localStorage.getItem('state');
if (serializedState === null) return undefined;
return JSON.parse(serializedState);
} catch (err) { return undefined; }
};
export const saveState = (state) => {
try {
const serializedState = JSON.stringify(state);
} catch (err) {
// errors
}
}
在redux商店中,您可以放置:
import { loadState, saveState } from './localStorage';
const persistedState = loadState();
const store = createStore(persistedState);
store.subscribe(() => saveState(store.getState()));
資料來源: https : //egghead.io/lessons/javascript-redux-persisting-the-state-to-the-local-storage
我通過添加以下代碼解決了我的問題
componentDidMount() {
this.props.getCart();
}
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