[Connect redux to the React app] #redux

snippet.js

// Redux:
const ADD = 'ADD'

const addMessage = (message) => {
  return {
    type: ADD,
    message: message
  }
};

const messageReducer = (state = [], action) => {
  switch (action.type) {
    case ADD:
      return [
        ...state,
        action.message
      ];
    default:
      return state
  }
};

const store = Redux.createStore(messageReducer)

// React:
const Provider = ReactRedux.Provider
const connect = ReactRedux.connect

class Presentational extends React.Component {
  constructor(props) {
    super(props)
    this.state = {
      input: ''
    }

    this.handleChange = this.handleChange.bind(this)
    this.submitMessage = this.submitMessage.bind(this)
  }
  handleChange(event) {
    this.setState({
      input: event.target.value
    })
  }
  submitMessage() {
    this.setState({
      input: ''
    })
    
    this.props.submitNewMessage(this.state.input)
  }
  render() {
    return (
      <div>
        <h2>Type in a new Message:</h2>
        <input
          value={this.state.input}
          onChange={this.handleChange}/><br/>
        <button onClick={this.submitMessage}>Submit</button>
        <ul>
          // Will be managed by Redux
          {this.props.messages.map( (message, idx) => {
              return (
                 <li key={idx}>{message}</li>
              )
            })
          }
        </ul>
      </div>
    )
  }
}

// React-Redux:
const mapStateToProps = (state) => {
  return {messages: state}
}

const mapDispatchToProps = (dispatch) => {
  return {
    submitNewMessage: (message) => {
      dispatch(addMessage(message))
    }
  }
}

// Component container:
const Container = connect(mapStateToProps, mapDispatchToProps)(Presentational)

class AppWrapper extends React.Component {
  render() {
    return (
      <Provider store={store}>
        <Container/>
      </Provider>
    );
  }
};