Javascript React Redux无法使减速器拾取动作
我一直在学习redux&react,并且正在建立一个待办事项列表。我一直在阅读和阅读不同的文章,但无法找出我在设置中遗漏了什么 目前,您可以通过输入添加todo。按enter键时,它会发送带有todo文本的Javascript React Redux无法使减速器拾取动作,javascript,reactjs,redux,react-redux,Javascript,Reactjs,Redux,React Redux,我一直在学习redux&react,并且正在建立一个待办事项列表。我一直在阅读和阅读不同的文章,但无法找出我在设置中遗漏了什么 目前,您可以通过输入添加todo。按enter键时,它会发送带有todo文本的addTodo操作 我希望reducer能够看到动作类型并更新状态,但它从来没有这样做过。我错过了什么 index.jsx import React from 'react'; import ReactDOM from 'react-dom'; import { createStore } f
addTodo
操作
我希望reducer能够看到动作类型并更新状态,但它从来没有这样做过。我错过了什么
index.jsx
import React from 'react';
import ReactDOM from 'react-dom';
import { createStore } from 'redux';
import { Provider } from 'react-redux';
import reducer from './reducer.js';
import TodoList from './containers/container.js';
const store = createStore(reducer);
ReactDOM.render(
<Provider store={store}>
<TodoList />
</Provider>,
document.getElementById('app'));
import React from 'react';
import TodoComponent from './TodoComponent.jsx';
import { addTodo } from '../actions/actions.js'
export default class TodoList extends React.Component {
render () {
const { todos } = this.props;
return (
<div>
<input type='text' placeholder='Add todo' onKeyDown={this.onSubmit} />
<ul>
{todos.map(c => (
<li key={t.id}>
<TodoComponent todo={t} styleName='large' />
</li>
))}
</ul>
</div>
)
}
onSubmit(e) {
const input = e.target;
const text = input.value;
const isEnterKey = (e.which === 13);
if (isEnterKey) {
input.value = '';
addTodo(text);
}
}
}
import React from 'react';
import CSSModules from 'react-css-modules';
import styles from './style.css';
export default class TodoComponent extends React.Component {
render () {
const { todo } = this.props;
return (
<div styleName='large'>{todo.text}</div>
)
}
}
export default CSSModules(TodoComponent, styles);
TodoListComponent.jsx
import React from 'react';
import ReactDOM from 'react-dom';
import { createStore } from 'redux';
import { Provider } from 'react-redux';
import reducer from './reducer.js';
import TodoList from './containers/container.js';
const store = createStore(reducer);
ReactDOM.render(
<Provider store={store}>
<TodoList />
</Provider>,
document.getElementById('app'));
import React from 'react';
import TodoComponent from './TodoComponent.jsx';
import { addTodo } from '../actions/actions.js'
export default class TodoList extends React.Component {
render () {
const { todos } = this.props;
return (
<div>
<input type='text' placeholder='Add todo' onKeyDown={this.onSubmit} />
<ul>
{todos.map(c => (
<li key={t.id}>
<TodoComponent todo={t} styleName='large' />
</li>
))}
</ul>
</div>
)
}
onSubmit(e) {
const input = e.target;
const text = input.value;
const isEnterKey = (e.which === 13);
if (isEnterKey) {
input.value = '';
addTodo(text);
}
}
}
import React from 'react';
import CSSModules from 'react-css-modules';
import styles from './style.css';
export default class TodoComponent extends React.Component {
render () {
const { todo } = this.props;
return (
<div styleName='large'>{todo.text}</div>
)
}
}
export default CSSModules(TodoComponent, styles);
reducer.js
var uuid = require('node-uuid');
export function addTodo(text) {
console.log('action addTodo', text);
return {
type: 'ADD_TODO',
payload: {
id: uuid.v4(),
text: text
}
};
}
import { connect } from 'react-redux';
import TodoList from '../components/TodoListComponent.jsx';
import { addTodo } from '../actions/actions.js';
const mapStateToProps = (state) => {
return {
todos: state
}
};
const mapDispatchToProps = (dispatch) => {
return {
addTodo: text => dispatch(addTodo(text))
}
};
export default connect(mapStateToProps, mapDispatchToProps)(TodoList);
import { List, Map } from 'immutable';
const init = List([]);
export default function(todos = init, action) {
console.log('reducer action type', action.type);
switch(action.type) {
case 'ADD_TODO':
console.log('ADD_TODO');
return todos.push(Map(action.payload));
default:
return todos;
}
}
在
TodoListComponent
中,您直接从操作文件导入操作,但实际上您希望使用映射到容器中的dispatch和pass属性的操作。这就解释了为什么您会看到来自操作的日志,而不是来自reducer的日志,因为操作从未被分派到存储区
因此,您的ToDoList组件应该是:
import React from 'react';
import TodoComponent from './TodoComponent.jsx';
export default class TodoList extends React.Component {
render () {
const { todos } = this.props;
return (
<div>
<input type='text' placeholder='Add todo' onKeyDown={this.onSubmit} />
<ul>
{todos.map(c => (
<li key={t.id}>
<TodoComponent todo={t} styleName='large' />
</li>
))}
</ul>
</div>
)
}
onSubmit(e) {
const input = e.target;
const text = input.value;
const isEnterKey = (e.which === 13);
if (isEnterKey) {
input.value = '';
this.props.addTodo(text);
}
}
}
从“React”导入React;
从“/TodoComponent.jsx”导入TodoComponent;
导出默认类TodoList扩展React.Component{
渲染(){
const{todos}=this.props;
返回(
{todos.map(c=>(
-
))}
)
}
提交(e){
常量输入=e.目标;
常量文本=input.value;
常数IsInterkey=(e.which==13);
如果(ISINTERKEY){
input.value='';
this.props.addTodo(text);
}
}
}
在您的TodoListComponent
中,您直接从操作文件导入操作,但实际上您希望使用映射到容器中的dispatch and pass as属性的操作。这就解释了为什么您会看到来自操作的日志,而不是来自reducer的日志,因为操作从未被分派到存储区
因此,您的ToDoList组件应该是:
import React from 'react';
import TodoComponent from './TodoComponent.jsx';
export default class TodoList extends React.Component {
render () {
const { todos } = this.props;
return (
<div>
<input type='text' placeholder='Add todo' onKeyDown={this.onSubmit} />
<ul>
{todos.map(c => (
<li key={t.id}>
<TodoComponent todo={t} styleName='large' />
</li>
))}
</ul>
</div>
)
}
onSubmit(e) {
const input = e.target;
const text = input.value;
const isEnterKey = (e.which === 13);
if (isEnterKey) {
input.value = '';
this.props.addTodo(text);
}
}
}
从“React”导入React;
从“/TodoComponent.jsx”导入TodoComponent;
导出默认类TodoList扩展React.Component{
渲染(){
const{todos}=this.props;
返回(
{todos.map(c=>(
-
))}
)
}
提交(e){
常量输入=e.目标;
常量文本=input.value;
常数IsInterkey=(e.which==13);
如果(ISINTERKEY){
input.value='';
this.props.addTodo(text);
}
}
}
从“React”导入React;
从“/TodoComponent.jsx”导入TodoComponent;
导出默认类TodoList扩展React.Component{
渲染(){
const{todos}=this.props;
返回(
{todos.map(c=>(
-
))}
)
}
提交(e){
//使用通过connect传递的addTodo
const{addTodo}=this.props;
常量输入=e.目标;
常量文本=input.value;
常数IsInterkey=(e.which==13);
如果(ISINTERKEY){
input.value='';
addTodo(文本);
}
}
}
从“React”导入React;
从“/TodoComponent.jsx”导入TodoComponent;
导出默认类TodoList扩展React.Component{
渲染(){
const{todos}=this.props;
返回(
{todos.map(c=>(
-
))}
)
}
提交(e){
//使用通过connect传递的addTodo
const{addTodo}=this.props;
常量输入=e.目标;
常量文本=input.value;
常数IsInterkey=(e.which==13);
如果(ISINTERKEY){
input.value='';
addTodo(文本);
}
}
}
在TodoListComponent.jsx
中,您应该使用addTodo
通过connect
传入的props
作为下面答案的旁注,在Redux中工作时,您的还原程序应该始终返回一个新的状态实例,而不是操纵当前状态,而不是返回todos.push(Map(action.payload));
这会改变您应该使用的当前数组返回todos.concat(Map(action.payload))
它将从您当前的状态和操作负载返回一个新数组。在TodoListComponent.jsx
中,您应该使用addTodo
通过connect
传递给的addTodo
作为下面答案的旁注,在Redux中工作时,您的还原程序应该始终返回一个新的状态实例,而不是mani填充当前状态,而不是返回todos.push(Map(action.payload));
这会改变当前数组,您应该使用返回todos.concat(Map(action.payload));
它将从您当前的状态返回一个新数组&操作负载。感谢您的解释,这是有意义的。这样做,您的答案缺少了@opheman answer中建议的“onKeyDown={this.onSubmit.bind(this)}”。感谢您的解释,这是有意义的。这样做,您的答案缺少了“onKeyDown”={this.onSubmit.bind(this)}`这是@opheman答案中建议的。