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counter.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Events in React</title>
<script src="https://unpkg.com/react@15/dist/react.min.js"></script>
<script src="https://unpkg.com/react-dom@15/dist/react-dom.min.js"></script>
<script src="https://unpkg.com/babel-standalone@6/babel.min.js"></script>
<style media="screen">
#container {
padding: 50px;
background-color: #FFF;
}
</style>
</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>
);
}
}
let destination = document.getElementById('container');
class CounterParent extends React.Component {
constructor(props) {
super(props);
this.state = {count: 0}
this.increase = this.increase.bind(this);
}
increase(e) {
let currentCount = this.state.count;
if (e.shiftKey) {
currentCount += 10
} else {
currentCount += 1
}
this.setState( {
count : currentCount
});
}
render() {
let backgroundStyle = {
padding: 50,
backgroundColor: "#FFC53A",
width: 250,
height: 100,
borderRadius: 10,
textAlign: "center"
}
let buttonStyle = {
fontSize: "1em",
width: 40,
height: 30,
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>,
destination
);
</script>
</body>
</html>