Question

我一直在学习redux＆amp;做出反应并建立一个待办事项清单。我一直在阅读和查看不同的文章，但无法弄清楚我在设置中缺少的内容。

目前，您可以通过输入添加待办事项。在按下输入时，它会发送带有待办事项文本的addTodo操作。

我希望reducer能够看到动作类型并更新状态，但它永远不会。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'));

actions.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
    }
  };
}

TodoListComponent.jsx

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);
    }
  }

}

TodoComponent.jsx

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);

container.js

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);

reducer.js

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;
  }
}

Answer 1

在TodoListComponent中，您直接从您的操作文件中导入操作，但实际上您希望使用映射的操作进行调度并将其作为属性传递到容器中。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，因为操作永远不会分派到商店。

所以你的TodoListComponent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);
    }
  }

}

Answer 2

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.bind(this)} />
        <ul>
          {todos.map(c => (
            <li key={t.id}>
              <TodoComponent todo={t} styleName='large' />
            </li>
          ))}
        </ul>
      </div>
    )
  }

  onSubmit(e) {
    // use the addTodo passed via connect
    const { addTodo } = this.props;
    const input = e.target;
    const text = input.value;
    const isEnterKey = (e.which === 13);

    if (isEnterKey) {
      input.value = '';
      addTodo(text);
    }
  }

}

React Redux无法让reducer接受行动

2 个答案: