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Chapter09.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Chapter 9!</title>
<script src="https://unpkg.com/[email protected]/dist/react.js"></script>
<script src="https://unpkg.com/[email protected]/dist/react-dom.js"></script>
<style>
#container {
padding: 50px;
background-color: #FFF;
}
</style>
</head>
<body>
<div id="container"></div>
<script src="https://unpkg.com/babel-standalone@6/babel.min.js"></script>
<!-- Your custom script here -->
<script type="text/babel">
class Circle extends React.Component {
render() {
const circleStyle = {
padding: 10,
margin: 20,
display: "inline-block",
backgroundColor: this.props.bgColor,
borderRadius: "50%",
width: 100,
height: 100
};
return <div style={circleStyle}>
</div>;
}
}
// JSX can live anywhere, even outside render()
function showCircle() {
const colors = ["#393E41", "#E94F37", "#1C89BF", "#A1D363"];
const ran = Math.floor(Math.random() * colors.length);
return <Circle bgColor={colors[ran]}/>;
}
// Rendering an array of JSX components
const colors = ["#393E41", "#E94F37", "#1C89BF", "#A1D363",
"#85FFC7", "#297373", "#FF8552", "#A40E4C"];
const renderData = [];
for (const i in colors) {
const c = colors[i];
renderData.push(<Circle key={i+c} bgColor={c}/>); //specify key prop to be a unique identifier for React to optimize UI updates
}
const destination = document.querySelector("#container");
ReactDOM.render(
<div>
{showCircle()}
{renderData}
</div>, destination);
</script>
</body>
</html>