Javascript 无法使用react redux更新状态 我想做什么
我想在React应用程序中使用Redux管理两个状态。这两种状态分别是Javascript 无法使用react redux更新状态 我想做什么,javascript,reactjs,redux,react-redux,Javascript,Reactjs,Redux,React Redux,我想在React应用程序中使用Redux管理两个状态。这两种状态分别是userName和isLogin,这是包含用户是否登录的布尔值 代码 我通过阅读一些初学者的网页来编写代码 src/components/Login.js class Login extends React.Component { constructor(props) { super(props); this.state = { email: '', password: '',
userName
和isLogin
,这是包含用户是否登录的布尔值
代码
我通过阅读一些初学者的网页来编写代码
src/components/Login.js
class Login extends React.Component {
constructor(props) {
super(props);
this.state = {
email: '',
password: '',
};
this.handleEmail = this.handleEmail.bind(this);
this.handlePassword = this.handlePassword.bind(this);
this.handleMainPage = this.handleMainPage.bind(this);
}
handleMainPage(){
this.props.onSubmit(this.state.email);
}
handleEmail(event) {
this.setState({email: event.target.value});
}
handlePassword(event) {
this.setState({password: event.target.value});
}
render() {
return (
<Container component="main">
<CssBaseline />
<div>
<Typography component="h1" variant="h5">
Login
</Typography>
<form noValidate>
<TextField value={this.state.email} onChange={this.handleEmail}/>
<TextField value={this.state.password} onChange={this.handlePassword} type="password"/>
<Button onClick={this.handleMainPage}>
Sign In
</Button>
</form>
</div>
</Container>
)
}
}
export default Login;
src/reducers/index.js
const defaultState = {
userName: "",
isLogin: false,
};
const userStatus = (state=defaultState, action) => {
switch (action.type) {
case 'LOGIN':
return Object.assign({}, {
userName: action.userName,
isLogin: action.isLogin,
});
default:
return state;
}
}
export default userStatus;
export const login = (username) => {
return {
type: 'LOGIN',
userName: username,
isLogin: true,
};
}
src/actions/index.js
const defaultState = {
userName: "",
isLogin: false,
};
const userStatus = (state=defaultState, action) => {
switch (action.type) {
case 'LOGIN':
return Object.assign({}, {
userName: action.userName,
isLogin: action.isLogin,
});
default:
return state;
}
}
export default userStatus;
export const login = (username) => {
return {
type: 'LOGIN',
userName: username,
isLogin: true,
};
}
src/index.js
import React from 'react';
import ReactDOM from 'react-dom';
import { BrowserRouter as Router, Route } from 'react-router-dom';
import { Provider } from 'react-redux';
import { createStore } from 'redux';
import './index.css';
import App from './App';
import MainWindow from './Main';
import userStatus from './reducers';
import * as serviceWorker from './serviceWorker';
var Routes = (
<Route path='/' component={App}>
<Route exact path='/' component={App} />
<Route path='/login' component={App} />
<Route path='/signup' component={App} />
<Route path='/main' component={MainWindow} />
</Route>
);
let store = createStore(userStatus);
ReactDOM.render(
<Provider store={ store }>
<Router>{Routes}</Router>
</Provider>,
document.getElementById('root')
);
serviceWorker.unregister();
从“React”导入React;
从“react dom”导入react dom;
从“react Router dom”导入{BrowserRouter as Router,Route};
从'react redux'导入{Provider};
从“redux”导入{createStore};
导入“./index.css”;
从“./App”导入应用程序;
从“/Main”导入主窗口;
从“./reducers”导入用户状态;
将*作为serviceWorker从“/serviceWorker”导入;
变量路由=(
);
let store=createStore(userStatus);
ReactDOM.render(
{Routes}
,
document.getElementById('root'))
);
serviceWorker.unregister();
我在src/reducers/index.js中选中了action.userName
和action.isLogin
,它们的值是我在登录表单中输入的,但在src/components/login.js中,这些值是空的和false(初始状态)
如何正确更新这些状态?看起来您没有提交表单。您需要一个函数(通常是handleSubmit)来提交表单。比如说:
<form onSubmit={handleSubmit}>
// ...
<Button variant="contained" color="secondary" type="submit">
Add note
</Button>
</form>
您的
LOGIN
操作是否已调度?我想我是在src/container/LOGIN.js中的mapDispatchToProps
函数中调度的。它错了吗?不,看起来不错,但是,您是否在Redux开发工具中检查过您的操作是否已实际调度?我想澄清一下,我不是在使用Redux,而是在使用useContext、useReducer模仿Redux,UseState还将进一步了解这一点,可能与您对对象的命名有关,因为调度中存在一些差异。谢谢您的回答。我在按钮上设置了type=“submit”
,并为表单编写了handleSubmit
函数。然后,将this.props.onSubmit
函数移动到handleSubmit
中,它就成功了!