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React stopwatch sample
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| <html> | |
| <head> | |
| <title>React StopWatch sample</title> | |
| <meta name="viewport" content="width=device-width"> | |
| <script src="http://fb.me/react-0.13.1.js"></script> | |
| <script src="http://fb.me/JSXTransformer-0.13.1.js"></script> | |
| </head> | |
| <body> | |
| <script type="text/jsx"> | |
| var StopWatch = React.createClass({ | |
| getInitialState: function() { | |
| return { | |
| isStart: false, | |
| elapsed: 0, | |
| diff: 0, | |
| laps: [], | |
| }; | |
| }, | |
| componentWillUnmount: function() { // clear timer | |
| clearInterval(this.state.timer); | |
| this.setState({timer: undefined}); | |
| }, | |
| tick: function() { | |
| var elapsed = Date.now() - this.state.start + this.state.diff; | |
| this.setState({elapsed: elapsed}); | |
| }, | |
| getTimeSpan: function(elapsed) { // 754567(ms) -> "12:34.567" | |
| var m = String(Math.floor(elapsed/1000/60)+100).substring(1); | |
| var s = String(Math.floor((elapsed%(1000*60))/1000)+100).substring(1); | |
| var ms = String(elapsed % 1000 + 1000).substring(1); | |
| return m+":"+s+"."+ms; | |
| }, | |
| onClick: function() { | |
| if(!this.state.isStart) { // start | |
| var timer = setInterval(this.tick, 33); | |
| this.setState({ | |
| isStart: true, | |
| timer: timer, | |
| start: new Date(), | |
| }); | |
| } else { // pause | |
| clearInterval(this.state.timer); | |
| this.setState({ | |
| timer: undefined, | |
| isStart: false, | |
| diff: this.state.elapsed, | |
| }); | |
| } | |
| }, | |
| setLap: function() { | |
| var lapElapsed = this.state.laps.length ? this.state.laps[0].elapsed : 0; | |
| var lapTitle = "Lap"+(this.state.laps.length+1); | |
| var lapTime = lapTitle+": "+this.getTimeSpan(this.state.elapsed - lapElapsed) | |
| var lapElem = { label: lapTime, elapsed: this.state.elapsed }; | |
| this.setState({laps: [lapElem].concat(this.state.laps)}); | |
| }, | |
| reset: function() { | |
| clearInterval(this.state.timer); | |
| this.setState({ | |
| timer: undefined, | |
| isStart: false, | |
| elapsed: 0, | |
| diff: 0, | |
| laps: [], | |
| }); | |
| }, | |
| render: function() { | |
| return ( | |
| <div> | |
| <h1>{this.getTimeSpan(this.state.elapsed)}</h1> | |
| <button onClick={this.onClick} style={style.button}> | |
| {this.state.isStart ? "pause" : "start"} | |
| </button> | |
| <button onClick={this.setLap} style={style.button}>lap</button> | |
| <button onClick={this.reset} style={style.button}>reset</button> | |
| <ul style={style.lap}> | |
| {this.state.laps.map(function(lap) { | |
| return <li key={lap.id}>{lap.label}</li>; | |
| })} | |
| </ul> | |
| </div> | |
| ); | |
| } | |
| }); | |
| var style = { | |
| button: { | |
| fontSize: 20, | |
| height: 44, | |
| width: 88, | |
| margin: 5, | |
| }, | |
| lap: { | |
| fontSize: 28, | |
| padding: 5, | |
| listStyleType: 'none', | |
| } | |
| }; | |
| React.render( <StopWatch />, document.body ); | |
| </script> | |
| </body> | |
| </html> |
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