annotate website/src/fschmidt/stopwatch.html @ 1460:3ab0d043370f

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author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 23 Mar 2020 00:04:42 -0600
parents 2555154ad19f
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1 <!doctype html>
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2 <html>
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3 <head>
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4 <title>Stopwatch</title>
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5 <meta name="viewport" content="width=device-width, initial-scale=1">
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6 <style>
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7 body {
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8 text-align: center;
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9 }
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10 button {
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11 cursor: pointer;
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12 font-size: inherit;
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13 border-radius: 6px;
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14 display: none;
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15 }
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16 </style>
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17 <script>
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18
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19 function now() {
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20 return Math.floor(Date.now()/1000);
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21 }
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22
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23 function show() {
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24 var start = localStorage.start;
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25 var time;
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26 if( !start ) {
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27 time = 0;
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28 } else {
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29 var stop = localStorage.stop || now();
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30 time = stop - start;
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31 }
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32 var seconds = time % 60;
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33 time = Math.floor(time/60);
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34 var minutes = time % 60;
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35 time = Math.floor(time/60);
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36 var hours = time;
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37 seconds = ('0'+seconds).slice(-2);
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38 minutes = ('0'+minutes).slice(-2);
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39 time = hours + ':' + minutes + ':' + seconds;
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40 document.querySelector('[time]').innerHTML = time;
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41
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42 // fix buttons
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43 var isRunning = localStorage.start && !localStorage.stop;
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44 if( isRunning ) {
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45 document.querySelector('[start]').style.display = 'none';
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46 document.querySelector('[stop]').style.display = 'inline-block';
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47 document.querySelector('[reset]').style.display = 'none';
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48 } else {
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49 document.querySelector('[start]').style.display = 'inline-block';
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50 document.querySelector('[stop]').style.display = 'none';
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51 if( localStorage.start ) {
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52 document.querySelector('[reset]').style.display = 'inline-block';
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53 } else {
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54 document.querySelector('[reset]').style.display = 'none';
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55 }
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56 }
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57 }
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58
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59 function start() {
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60 var stop = localStorage.stop;
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61 if( !stop ) {
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62 localStorage.start = now();
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63 } else {
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64 localStorage.removeItem('stop');
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65 localStorage.start = now() - (stop - localStorage.start);
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66 }
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67 show();
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68 }
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69
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70 function stop() {
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71 localStorage.stop = now();
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72 show();
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73 }
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75 function reset() {
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76 localStorage.removeItem('start');
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77 localStorage.removeItem('stop');
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78 show();
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79 }
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81 function loaded() {
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82 show();
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83 setInterval(show,1000);
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84 }
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86 </script>
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87 </head>
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88 <body onload="loaded()">
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89 <h1 time></h1>
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90 <button start onclick="start()">start</button>
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91 <button stop onclick="stop()">stop</button>
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92 <button reset onclick="reset()">reset</button>
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93 </body>
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94 </html>