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counter.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Events</title>
<script src="https://unpkg.com/react@16/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
<script src="https://unpkg.com/[email protected]/babel.min.js"></script>
</head>
<body>
<div id="container"></div>
<script type="text/babel">
class Counter extends React.Component {
render() {
var textStyle = {
fontSize: 72,
fontFamily: "sans-serif",
color: "#333",
fontWeight: "bold"
};
return (
<div style={textStyle}>
{this.props.display}
</div>
);
}
}
class CounterParent extends React.Component {
constructor(props) {
super(props);
this.state = {
count: 0
};
this.increase = this.increase.bind(this);
}
increase(e) {
var currentCount = this.state.count;
if (e.shiftKey){
currentCount += 10;
}else{
currentCount += 1;
}
this.setState({
count: currentCount
});
}
render() {
var backgroundStyle = {
padding: 50,
backgroundColor: "#FFC53A",
width: 250,
height: 100,
borderRadius: 10,
textAlign: "center"
};
var buttonStyle = {
fontSize: "1em",
width: 50,
height: 50,
fontFamily: "sans-serif",
color: "#333",
fontWeight: "bold",
lineHeight: "3px"
};
return (
<div style={backgroundStyle}>
<Counter display={this.state.count}/>
<button onClick={this.increase} style={buttonStyle}>+</button>
</div>
);
}
}
ReactDOM.render(
<div>
<CounterParent/>
</div>,
document.querySelector("#container")
);
</script>
</body>
</html>