LearningReact-AW/Chapter12.html at master · sharkfisher/LearningReact-AW · GitHub

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<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8" />
	<title>Chapter 12 Refs!</title>
	<script src="https://unpkg.com/react@15.6.1/dist/react.js"></script>
	<script src="https://unpkg.com/react-dom@15.6.1/dist/react-dom.js"></script>
	<style>
	#container {
		padding: 50px;
		background-color: #FFF;
	}
	.colorSquare {
		height: 242px;
		width: 242px;
		margin-bottom: 15px;
		box-shadow: 0px 0px 25px 0px #333;
	}
	.colorArea input {
		padding: 10px;
		font-size: 16px;
		border: 2px solid #CCC;
	}
	.colorArea button {
		padding: 10px;
		font-size: 16px;
		margin: 10px;
		background-color: #666;
		color: #FFF;
		border: 2px solid #666;
	}
	.colorArea button:hover {
		background-color: #111;
		border-color: #111;
		cursor: pointer;
	}
	.colorArea p {
		font-family: sans-serif;
		font-size: 16px;
		height: 16px;
	}
	</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 Colorizer extends React.Component {
		constructor(props) {
			super(props);
			this.state = {bgColor: ''};
		}
		render() {
			const squareStyle = {
				backgroundColor: this.state.bgColor
			};
			return <div className="colorArea">
				<div style={squareStyle} className="colorSquare"></div>
				<p>{this.state.bgColor}</p>
				<form onSubmit={this.setNewColor}>
				<input
				ref={el=>this._input = el} /* use ref to capture the input element after mounting so it can be referenced later */
				placeholder="Enter a color value">
				</input>
				<button type="submit">go</button>
				</form>
				</div>;
		}

		setNewColor = e => {
			const color = this._input.value; //setState() is async. so capture the current input value locally before clearing it.
			this.setState({bgColor: color});

			// Use the ref feature to manipulate the <input> element
			this._input.value = '';
			this._input.focus();

			e.preventDefault();
		}
	}
	const destination = document.querySelector("#container");
	ReactDOM.render(
	<div>
		<Colorizer/>
	</div>, destination);
	</script>
</body>
</html>