<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<script src="../build/react.development.js"></script>
<script src="../build/react-dom.development.js"></script>
<script src="../build/babel.min.js"></script>
</head>
<body>
<div id="example"></div>
<!-- https://reactjs.org/docs/refs-and-the-dom.html#callback-refs -->
<script type="text/babel">
class MyComponent extends React.Component {
constructor(props) {
super(props);
this.myTextInput = React.createRef();
this.handleClick = this.handleClick.bind(this)
}
handleClick() {
this.myTextInput.current.focus();
console.log (this.myTextInput.current.value) // Get the value input box
}
render() {
return (
<div>
<input type="text" ref={this.myTextInput} />
<input type="button" value="Focus the text input" onClick={this.handleClick} />
</div>
);
}
}
ReactDOM.render(
<MyComponent />,
document.getElementById('example')
);
</script>
</body>
</html>