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10-example-app.html
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10-example-app.html
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<!doctype html>
<title>10 Example App - React From Zero</title>
<script src="https://unpkg.com/react@16.4.0/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom@16.4.0/umd/react-dom.development.js"></script>
<script src="https://unpkg.com/create-react-class@15.6.3/create-react-class.js"></script>
<script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
<div id="app"></div>
<script type="text/babel">
var Idle = function(props) {
return (
<React.Fragment>
<button onClick={props.onStart}>Start timer</button>
<h2>No Timer Running.</h2>
</React.Fragment>
);
};
var Timer = createReactClass({
getInitialState: function() {
return { seconds: this.props.minutes * 60 };
},
countDown: function() {
var onFinish = this.props.onFinish;
this.setState(function(prevState) {
var secondsLeft = prevState.seconds - 1;
if (secondsLeft < 1) return onFinish();
return { seconds: secondsLeft };
});
},
interval: null,
componentDidMount: function() {
this.interval = setInterval(this.countDown, 1000);
},
componentWillUnmount: function() {
clearInterval(this.interval);
},
render: function() {
var seconds = this.state.seconds;
var minutes = Math.floor(seconds / 60);
seconds = seconds % 60;
return (
<React.Fragment>
<button onClick={this.props.onStop}>Stop timer</button>
<h2 style={{ color: this.props.color }}>
{this.props.title} for {minutes} minutes and {seconds}{" "}
seconds.
</h2>
</React.Fragment>
);
}
});
var PomodoroApp = createReactClass({
IDLE: 0,
WORK: 1,
PAUSE: 2,
getInitialState: function() {
return {
count: 0,
step: this.IDLE
};
},
handleWork: function() {
this.setState({ step: this.WORK });
},
handlePause: function() {
this.setState(function(prevState) {
return {
count: prevState.count + 1,
step: this.PAUSE
};
});
},
handleIdle: function() {
this.setState({ step: this.IDLE });
},
getTimerElement: function() {
var step = this.state.step;
if (step == this.PAUSE)
return (
<Timer
key="pause"
title="Pause"
color="green"
minutes={5}
onFinish={this.handleWork}
onStop={this.handleIdle}
/>
);
if (step == this.WORK)
return (
<Timer
key="work"
title="Work"
color="orange"
minutes={25}
onFinish={this.handlePause}
onStop={this.handleIdle}
/>
);
return <Idle onStart={this.handleWork} />;
},
style: {
display: "flex",
flexDirection: "column",
alignItems: "center"
},
render: function() {
var count = this.state.count;
return (
<div style={this.style}>
<h1>Pomodoro Timer</h1>
{this.getTimerElement()}
{!!count && <h2>You worked {count * 25} minutes today!</h2>}
</div>
);
}
});
var renderTarget = document.getElementById("app");
ReactDOM.render(<PomodoroApp />, renderTarget);
</script>