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Incrementer Component React
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| class Form extends React.Component { | |
| constructor(props) { | |
| super(props); | |
| this.state = {value: 0}; | |
| this.handleChange = this.handleChange.bind(this); | |
| this.incrementValue = this.incrementValue.bind(this); | |
| this.decrementValue = this.decrementValue.bind(this); | |
| } | |
| handleChange(event) { | |
| this.setState({value: event.target.value}); | |
| } | |
| incrementValue(event) { | |
| if (this.state.value < this.props.max){ | |
| this.state.value++; | |
| this.setState({value: this.state.value}); | |
| } | |
| } | |
| decrementValue(event) { | |
| if (this.state.value > this.props.min){ | |
| this.state.value--; | |
| this.setState({value: this.state.value}); | |
| } | |
| } | |
| render() { | |
| return ( | |
| <div> | |
| <input | |
| type="text" | |
| value={this.state.value} | |
| onChange={this.handleChange} | |
| min="0" max="10" | |
| /> | |
| <button onClick={this.incrementValue}> | |
| + | |
| </button> | |
| <button onClick={this.decrementValue}> | |
| - | |
| </button> | |
| </div> | |
| ); | |
| } | |
| } | |
| ReactDOM.render( | |
| <Form min="0" max="20" />, | |
| document.getElementById('root') | |
| ); |
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