[英]Very first time with redux. How to implement?
我正在閱讀Redux的一些教程,但仍然無法理解如何將其實現到現有組件。 每個教程都有一些不同的方法,我很困惑。 我有下面的代碼,並想使用Redux進行狀態管理。 我假設需要刪除this.setState
函數和控件狀態,但是在這種情況下,我實際上如何觸發函數handleSubmit
? 我已經寫了reducer, store, dispatch
,但是我還需要什么呢?
import React, { Component } from 'react';
import Dialog from 'material-ui/Dialog';
import FlatButton from 'material-ui/FlatButton';
import TextField from 'material-ui/TextField';
import { createStore } from "redux";
import { Provider } from 'react-redux'
const reducer = (state={errorText: '', open: true}, action) => {
switch(action.type) {
case "CHECK_PASSWORD": {
return state = {...state, open: false};
}
default:
return state;
}
}
const store = createStore(reducer, {
errorText: '',
open:true
});
store.subscribe(() => {
console.log('store change', store.getState())
})
store.dispatch({type: "CHECK_PASSWORD"})
export default class StartDialog extends Component {
handleSubmit = event => {
let password = this.refs.myPasswordValue.input.value;
// Check default password
if(password === "123"){
this.setState({ errorText: '', open: false})
} else if (password !== "123" && password !== "") {
this.setState({ errorText: "Password is incorrect" })
} else if (password === ""){
this.setState({ errorText: "Password is required" })
}
};
render() {
const actions = [ <FlatButton label="Submit" primary={true} onClick={this.handleSubmit} /> ];
return (
<Provider store={store} >
<Dialog title="Welcome to the React App!" actions={actions} modal={true} open={this.state.open} >
<TextField errorText={this.state.errorText}
hintText="Password Field"
floatingLabelText="Password"
type="password"
ref="myPasswordValue" />
</Dialog>
</Provider>
);}}
實際上,您不應該在派遣動作的同一組件中使用<Provider>
來采用這種類型的結構。 意味着我希望您將其視為父子關系,其中Provider
將在父級中,並且所有存儲操作和訂閱都應在子級中完成。 查看Dan Abramov關於Redux具有代碼結構的討論,因為UI組件中不應包含邏輯,而邏輯應在父組件中進行控制。
當您使用store中的狀態時,則不需要setState
。 實際上,當您需要狀態作為某些組件中的隱式數據時,則必須使用setState
。 同樣,在分派動作時,您已經描述了type
屬性,但沒有像reducer中提到的那樣附加實際的有效負載( open
)。
您還可以改善代碼結構,例如(以“新手透視”的方式)-
在index.js中,應集成主要的<Provider>
組件,以將狀態作為子組件提供給下方的組件。
示例index.js
(根)代碼類似於-
import React from 'react';
import ReactDOM from 'react-dom';
import store from './store/store';
import TodoApp from './container/todoapp';
import { Provider } from 'react-redux';
const render = () => {
ReactDOM.render(
<Provider store={store}>
<TodoApp />
</Provider>
,document.getElementById('root'));
}
因此,現在可以使用子組件存儲了。 因此,現在您可以使用connect()
進行連接以直接存儲為mapStateToProps
和mapDispatchToProps
必需的傳遞args
。
來自容器文件夾的todoapp.js
示例文件-
import React from 'react';
import ReactDOM from 'react-dom';
import store from '../store/store';
import Todolist from './components/todolist';
import AddTodo from './components/addtodo';
import Footer from './components/footer';
import { connect } from 'react-redux';
var noteId = 0;
const getVisibleTodos = (todos,filter) => {
switch(filter){
case 'SHOW_ALL' :
return todos;
case 'SHOW_COMPLETED' :
return todos.filter(t => t.completed);
case 'SHOW_ACTIVE' :
return todos.filter(t => !t.completed);
default :
return todos;
}
}
class TodoApp extends React.Component{
render() {
const {todos,visibilityFilter} = this.props;
return(
<div>
<AddTodo onAddClick={this.props.onAddTodoClick} />
<ul>
<Todolist todos={this.props.todos}
onTodoClick ={this.props.onTodoListClick}/>
</ul>
<Footer visibilityFilter={this.props.visibilityFilter}
onFilterClick={this.props.onLinkClick} />
<button onClick = {() => console.log(store.getState())}> Arbitrary Button </button>
</div>
);
}
}
const mapStateToProps = (state) => {
return {
visibilityFilter : state.visibilityFilter,
todos: getVisibleTodos(state.todos,state.visibilityFilter)
}
}
const mapDispatchToProps = (dispacth) => {
return {
onLinkClick : (filter) => {
store.dispatch({type :'SET_VISIBILITY_FILTER',filter});
},
onTodoListClick : (id) => {
store.dispatch({type:'TOGGLE_TODO',id});
},
onAddTodoClick : (text) => {
store.dispatch({type:'ADD_TODO',id : noteId++,text})
}
}
}
export default connect(mapStateToProps,mapDispatchToProps)(TodoApp);
render();
商店將包括-
import {createStore, combineReducers} from 'redux';
const todo = (state = [], action) => {
switch (action.type) {
case 'ADD_TODO':
return {
id: action.id,
text: action.text,
completed: false
}
case 'TOGGLE_TODO':
if (state.id !== action.id) {
return state;
}
return {
...state,
completed: !state.completed
}
default:
return state;
}
}
const todos = (state = [], action) => {
switch (action.type) {
case 'ADD_TODO':
return [
...state,
todo(undefined, action)
]
case 'TOGGLE_TODO':
return state.map(t => todo(t, action));
default:
return state;
}
}
const visibilityFilter = (state = 'SHOW_ALL', action) => {
switch(action.type){
case 'SET_VISIBILITY_FILTER' :
return action.filter;
default :
return state;
}
}
const todoApp = combineReducers({ todos,visibilityFilter })
const store = createStore(todoApp);
console.log(store.getState());
export default store;
如果您要實施必須升級當前項目的更復雜的項目結構,請檢查此代碼結構-https://github.com/react-boilerplate/react-boilerplate
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