114 lines
2.1 KiB
Markdown
114 lines
2.1 KiB
Markdown
---
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title: Connect Redux to the Messages App
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---
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## Connect Redux to the Messages App
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### Solution
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<details>
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<summary>Spoiler!</summary>
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```jsx
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// Redux:
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const ADD = 'ADD';
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const addMessage = (message) => {
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return {
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type: ADD,
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message: message
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}
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};
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const messageReducer = (state = [], action) => {
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switch (action.type) {
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case ADD:
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return [
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...state,
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action.message
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];
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default:
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return state;
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}
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};
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const store = Redux.createStore(messageReducer);
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// React:
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class Presentational extends React.Component {
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constructor(props) {
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super(props);
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this.state = {
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input: '',
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messages: []
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}
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this.handleChange = this.handleChange.bind(this);
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this.submitMessage = this.submitMessage.bind(this);
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}
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handleChange(event) {
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this.setState({
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input: event.target.value
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});
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}
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submitMessage() {
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const currentMessage = this.state.input;
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this.setState({
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input: '',
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messages: this.state.messages.concat(currentMessage)
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});
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}
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render() {
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return (
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<div>
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<h2>Type in a new Message:</h2>
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<input
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value={this.state.input}
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onChange={this.handleChange}/><br/>
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<button onClick={this.submitMessage}>Submit</button>
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<ul>
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{this.state.messages.map( (message, idx) => {
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return (
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<li key={idx}>{message}</li>
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)
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})
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}
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</ul>
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</div>
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);
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}
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};
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// React-Redux:
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const mapStateToProps = (state) => {
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return { messages: state }
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};
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const mapDispatchToProps = (dispatch) => {
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return {
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submitNewMessage: (newMessage) => {
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dispatch(addMessage(newMessage))
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}
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}
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};
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const Provider = ReactRedux.Provider;
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const connect = ReactRedux.connect;
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// define the Container component here:
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const Container = connect(mapStateToProps,mapDispatchToProps)(Presentational)
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class AppWrapper extends React.Component {
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constructor(props) {
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super(props);
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}
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render() {
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// complete the return statement:
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return (
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<Provider store={store}>
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<Container />
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</Provider>
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);
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}
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};
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```
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</details>
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