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1 <!doctype html>
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2 <head>
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3 <meta charset="utf-8">
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4 <meta name="viewport" content="width=device-width, initial-scale=1.0">
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5 <title>QR Code Generator</title>
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6
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7 <style type="text/css">
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8 * {
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9 box-sizing: border-box;
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10 }
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11
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12 html {
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13 height: 100%;
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14 margin: 0;
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15 padding: 0;
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16 font-family: Arial, sans-serif;
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17 font-size: 12px;
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18 }
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19
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20 body {
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21 margin: 0;
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22 padding: 10px;
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23 height: 100%;
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24 }
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25
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26 .inputbox {
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27 width: 100%;
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28 margin-bottom: 10px;
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29 resize: vertical;
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30 font-family: Courier New, monospace;
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31 /* prevent ios zoom */
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32 font-size: 16px;
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33 }
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34
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35 .page {
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36 width: 100%;
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37 min-height: 100%;
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38 max-width: 600px;
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39 margin: 0 auto;
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40 display: flex;
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41 flex-direction: column;
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42 padding: 10px;
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43 }
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44
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45 .page__main {
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46 flex: 1;
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47 }
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48
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49 .outputbox {
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50 will-change: opacity;
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51 }
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52
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53 .outputbox.js-hidden {
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54 opacity: 0;
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55 }
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56
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57 .outputbox > canvas {
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58 display: none;
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59 }
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60
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61 .outputbox > img {
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62 max-width: 100%;
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63 max-height: calc(100vh - 250px);
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64 }
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65
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66 .title {
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67 font-size: 16px;
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68 }
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69 </style>
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70 </head>
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71 <body>
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72 <div class="page">
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73 <div class="page__main">
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74 <h1>QR Code Generator</h1>
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75
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76 <p>
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77 Type something and get its QR code (almost) immediately.
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78 </p>
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79
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80 <textarea class="inputbox js-qr-input" rows="4" autofocus></textarea>
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81
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82 <div class="outputbox js-qr-output"></div>
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83 </div>
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84
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85 <div>
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86 <hr>
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87
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88 <a href="https://hg.sr.ht/~nanaya/qr-html">Source</a>
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89 </div>
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90 </div>
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91
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92 <script src="qrcode.min.js"></script>
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93
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94 <script>
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95 var inputDom = document.querySelector(".js-qr-input")
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96 var outputDom = document.querySelector(".js-qr-output")
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97 var qr = new QRCode(outputDom, { correctLevel: QRCode.CorrectLevel.L, width: 1024, height: 1024 })
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98
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99 var runTimeout = null
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100 var debouncedRefreshCode = function() {
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101 clearTimeout(runTimeout)
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102 runTimeout = setTimeout(refreshCode, 100)
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103 }
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104
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105 var refreshCode = function() {
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106 var text = inputDom.value
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107
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108 if (text !== "") {
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109 qr.makeCode(text)
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110 outputDom.classList.remove('js-hidden')
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111 } else {
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112 outputDom.classList.add('js-hidden')
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113 }
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114 }
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115
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116 inputDom.addEventListener('input', debouncedRefreshCode)
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117 refreshCode()
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118 </script>
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119 </body>
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