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我是新來的反應+ redux。我遇到了一個問題，當我發送一個動作時，我的應用程序不會重新呈現。但是，我使用getState（）來檢查狀態，它確實發生了變化。我查閱文件，但仍然不知道問題是什麼。請幫助我，謝謝。Redux - 該應用程序在調度後不會重新渲染
的代碼是如下
==== actions.js ====
export const ADD_MAIL = 'ADD_MAIL';
export const DEL_MAIL = 'DEL_MAIL';
export function addMail(email) {
return {
type: ADD_MAIL,
email
}
}
export function delMail(id) {
return {
type: DEL_MAIL,
id
}
}
==== reducers.js ====
import { combineReducers } from 'redux'
import { ADD_MAIL, DEL_MAIL } from '../actions/actions'
import MAILS from '../data'
function emails(state = MAILS, action) {
switch (action.type) {
case ADD_MAIL:
console.log("ADD_MAIL");
return [
action.email,
...state
];
case DEL_MAIL:
let idx = state.length;
let i = 0;
// Find the target mail
while(idx--) {
if (state[idx] && state[idx].serialNo === action.id)
i = idx;
}
let arr1 = state.slice(0, i);
let arr2 = state.slice(i + 1);
let newList = arr1.concat(arr2);
console.log("DEL_MAIL");
return newList;
default:
return state;
}
}
const rootReducer = combineReducers({
emails
});
export default rootReducer;
= === main.js ====
import React from 'react'
import { render } from 'react-dom'
import { Link } from 'react-router'
import { connect } from 'react-redux'
import { createStore } from 'redux'
import { addMail, delMail } from './actions/actions'
import rootReducer from './reducers/reducers'
import * as btn from './module/button'
import * as module from './module/module'
var store = createStore(rootReducer);
class Inbox extends React.Component {
constructor(props) {
super(props);
this.state = {
searchText: ''
}
this.handleUserInput = this.handleUserInput.bind(this);
this.deleteMail = this.deleteMail.bind(this);
this.sendMail = this.sendMail.bind(this);
}
handleUserInput(searchText) {
this.setState({
searchText: searchText
});
}
deleteMail(obj) {
store.dispatch(delMail(obj.serialNo));
console.log(store.getState());
// This displays the correct new state in console after dispatch
}
sendMail(newMail) {
store.dispatch(addMail(newMail));
console.log(store.getState());
// This displays the correct new state in console after dispatch
}
render() {
let mails = [];
let search = this.state.searchText.toUpperCase();
let emails = this.props.emails;
emails.map(mail => {
if (mail.from.toUpperCase().indexOf(search) !== -1)
mails.push(mail);
});
let sender = (mails.length === emails.length) ? "all" : this.state.searchText;
return (
<div className="main">
<div className="toolbar">
<span>You have {mails.length} message from {sender}.</span>
<module.SearchInput searchText={this.state.searchText} onUserInput={this.handleUserInput} />
<div className="functions">
<btn.AddButton />
</div>
</div>
<div className="mailList">
{mails.map(mail => (
<div className="item" key={mail.serialNo}>
<div className="info sender">
From: {mail.from}
</div>
<div className="info date">
{mail.date}
</div>
<div className="info subject">
Subject: {mail.subject}
</div>
<div className="functions">
<btn.ReadButton serialNo={mail.serialNo} />
<btn.DeleteButton serialNo={mail.serialNo} deleteMail={this.deleteMail} />
</div>
</div>
))}
</div>
<module.NewMailInput sendMail={this.sendMail} />
</div>
);
}
}
function mapStateToProps(state) {
return {
emails: state.emails
};
}
export default connect(mapStateToProps)(Inbox);
==== app.js ====
import React from 'react'
import { render } from 'react-dom'
import { Router, Route, IndexRoute, browserHistory } from 'react-router'
import { createStore } from 'redux'
import { Provider } from 'react-redux'
import { Menu } from './menu'
import { Mail } from './main'
import Inbox from './main'
import rootReducer from './reducers/reducers'
var store = createStore(rootReducer);
class App extends React.Component {
constructor(props) {
super(props);
}
render() {
return (
<div style={{height: '100%'}}>
<Menu />
{this.props.children}
</div>
);
}
}
class Home extends React.Component {
constructor(props) {
super(props);
}
render() {
return (
<Inbox />
);
}
}
render(
<Provider store={store}>
<Router history={browserHistory}>
<Route path="/" component={App}>
<IndexRoute component={Home} />
<Route path="/inbox" component={Inbox} />
<Route path="/message/:mailSerial" component={Mail} />
</Route>
</Router>
</Provider>,
document.getElementById('app-container'))
謝謝你的回答和解釋。 我還有一個問題，如果我有另一個組件郵件，我如何訪問收件箱中的this.props.emails？謝謝。 – Ezek
@Ezek對不起，我不明白，你的意思是我怎樣才能在'Mail'而不是'Inbox'中訪問this.props.emails？ –
抱歉說明不清楚。我的意思是我怎樣才能在這兩個組件中共享相同的狀態。例如，在中，我可以使用this.props.emails來訪問電子郵件;在，我怎樣才能使用this.props.emails來訪問電子郵件狀態？ –
Ezek