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| A simple self-contained stopwatch. Live sample here: http://codepen.io/d_panayotov/pen/xjgLB |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>Stopwatch</title> | |
| </head> | |
| <body> | |
| <div>Time: <span id="time"></span></div> | |
| <input type="button" value="start" onclick="stopwatch.start();"> | |
| <input type="button" value="stop" onclick="stopwatch.stop();"> | |
| <input type="button" value="reset" onclick="stopwatch.reset();"> | |
| </body> | |
| <script type="text/javascript" src="stopwatch.js" onload = "stopwatch.update();"></script> | |
| </html> |
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| function Stopwatch(text, updateInterval) { | |
| this.text = text; | |
| this.updateInterval = updateInterval ? updateInterval : 100; | |
| this.startAt = 0; | |
| this.lapTime = 0; | |
| //returns current time | |
| this.now = function () { | |
| return (new Date()).getTime(); | |
| }; | |
| this.start = function () { | |
| this.startAt = this.startAt ? this.startAt : this.now(); | |
| var that = this; | |
| this.timer = this.timer ? this.timer : setInterval(function () { | |
| that.update() | |
| }, this.updateInterval); | |
| }; | |
| this.stop = function () { | |
| this.update(); | |
| this.lapTime = this.startAt ? this.lapTime + this.now() - this.startAt : this.lapTime; | |
| clearInterval(this.timer); | |
| this.startAt = this.timer = 0; | |
| }; | |
| this.reset = function () { | |
| this.lapTime = 0; | |
| this.startAt = this.startAt ? this.now() : 0; | |
| this.update(); | |
| }; | |
| //adds zero padding to numbers | |
| this.pad = function (num, size) { | |
| var s = "00000" + num; | |
| return s.substr(s.length - size); | |
| }; | |
| this.formattedTime = function () { | |
| var m, s, ms; | |
| var time = this.lapTime + (this.startAt ? this.now() - this.startAt : 0); | |
| time = time % (60 * 60 * 1000); | |
| m = Math.floor(time / (60 * 1000)); | |
| time = time % (60 * 1000); | |
| s = Math.floor(time / 1000); | |
| ms = time % 1000; | |
| return m + ':' + this.pad(s, 2) + '.' + this.pad(ms, 3); | |
| }; | |
| this.update = function () { | |
| this.text.innerHTML = this.formattedTime(); | |
| }; | |
| } | |
| //////////////////////////////////////////////////////////// | |
| var stopwatch = new Stopwatch(document.getElementById('time')); |
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