我不知道我做错了什么。
我认为我明白了如何用redux实现。
我的问题是,状态发生变化后,Component的状态不会传播到Component。我知道我们必须创建新的状态对象,我确信我做得对。但没有变化。
另一个问题是,为什么状态在对象" resetLink" 中看图像。为什么它不存储在状态对象中?
请帮助我让它发挥作用。
redux的行动:
export const sendResetLink = (email) => {
return {
type: RESET_LINK,
email
}
}
class App extends React.Component {
render() {
return <VisibleResetLink/>
}
}
这就是道具和调度功能发生的魔力:
import {connect} from 'react-redux';
import SendResetLink from '../components/SendResetLink.jsx';
import {sendResetLink} from '../actions/index'
import _ from 'lodash';
const mapDispatchToProps = (dispatch) => {
return {
onClick: (email) => {
dispatch(sendResetLink(email))
}
}
}
const mapStateToProps = (state) => {
console.log("actual state", state);
return _.assign({} , {state: state.resetLink});
}
const VisibleResetLink = connect(
mapStateToProps,
mapDispatchToProps
)(SendResetLink)
export default VisibleResetLink
这是加载道具的组件,但在更改时不会重新渲染它们。
import React, { PropTypes } from 'react';
import ReactDOM from 'react-dom';
class SendResetLink extends React.Component {
constructor(props, email, result) {
super(props);
console.log('props',props);
this.onClick = props.onClick;
this.result = props.state.result;
this.input = props.state.email;
}
renderResult (result){
console.log("renderResult",result);
if(result)
return <div className="card-panel deep-orange lighten-4">Invalid username and password.</div>
}
render() {
return <div>
{this.renderResult(this.result)}
{this.result}
<form className="col s12" action="/login" method="post" onSubmit={e => {
e.preventDefault()
if (!this.input.value.trim()) {
return
}
this.onClick(this.input.value);
this.input.value = ''
} }>
<div className="row">
<div className="input-field col s12">
<i className="material-icons prefix">email</i>
<input id="email" type="email" name="email" className="validate" ref = {(node) => this.input = node } />
<label for="email">Email</label>
</div>
</div>
<div className="divider"></div>
<div className="row">
<div className="col m12">
<p className="right-align">
<button className="btn btn-large waves-effect waves-light" type="submit" name="action">Send reset key</button>
</p>
</div>
</div>
</form></div>
}
}
SendResetLink.propTypes = {
onClick: PropTypes.func.isRequired,
state: PropTypes.object.isRequired
}
export default SendResetLink
这是另一个相关的代码片段,其中实现了reducer。
import _ from 'lodash';
const resetLink = (state = {email:"test@test.de", result:true}, action) => {
console.log('state', state)
switch (action.type) {
case 'RESET_LINK':
return _.assign({},state,{email: action.email, result: false});
default:
return state
}
}
export default resetLink;
import { combineReducers } from 'redux'
import resetLink from './ResetLinkReducer.jsx'
const resetApp = combineReducers({
resetLink
})
export default resetApp
import App from './components/app.jsx';
import {Provider} from 'react-redux';
import { createStore } from 'redux';
import { render } from 'react-dom';
import React from 'react';
import resetApp from './reducers/index.js';
let store = createStore(resetApp,{});
console.log(store)
render(<Provider store={store}>
<App />
</Provider>, document.getElementById('sendResetLinkComponent'));
console logs. After click the renderResult should change to false. But it stays on true
答案 0 :(得分:3)
您只需在构造函数中将VBoxManage convertfromraw
组件中的this.result
设置为一次,仅在实例化组件时执行。每次应用程序的状态更改时都不会执行构造函数:
SendResetLink
不是将状态的这一部分分配给反应组件的实例属性,而只需在this.result = props.state.result;
函数中直接使用props
属性:
render()