class App extends React.Component { constructor(props) { super(props); this.state = { value: 50 }; } render() { return <div> <p>Here's an example RangeStepInput:</p> <RangeStepInput min={0} max={100} value={this.state.value} step={1} onChange={this.onChange.bind(this)} /> </div>; }; onChange(e) { const newVal = forceNumber(e.target.value); this.setState({value: newVal}); } };