| 1 | <!DOCTYPE html>
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| 2 | <html lang="en">
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| 3 | <head>
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| 4 | <meta charset="utf-8">
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| 5 | <title>math.js | pretty printing with MathJax</title>
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| 6 |
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| 7 | <script src="../../lib/browser/math.js"></script>
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| 8 | <script src="https://polyfill.io/v3/polyfill.min.js?features=es6"></script>
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| 9 | <script src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-svg.js"></script>
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| 10 |
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| 11 | <style>
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| 12 | body,
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| 13 | html,
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| 14 | table td,
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| 15 | table th,
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| 16 | input[type=text] {
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| 17 | font-size: 11pt;
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| 18 | font-family: verdana, arial, sans-serif;
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| 19 | }
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| 20 |
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| 21 | h1 {
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| 22 | font-size: 11pt;
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| 23 | }
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| 24 |
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| 25 | input[type=text] {
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| 26 | padding: 5px;
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| 27 | width: 400px;
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| 28 | }
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| 29 |
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| 30 | table {
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| 31 | border-collapse: collapse;
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| 32 | }
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| 33 |
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| 34 | table td,
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| 35 | table th {
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| 36 | padding: 5px;
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| 37 | border: 1px solid lightgray;
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| 38 | }
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| 39 |
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| 40 | table th {
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| 41 | background-color: lightgray;
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| 42 | }
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| 43 |
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| 44 | </style>
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| 45 | </head>
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| 46 | <body>
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| 47 |
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| 48 | <h1>
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| 49 | Expression evaluation with math.js, pretty printing with MathJax
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| 50 | </h1>
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| 51 |
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| 52 | <table>
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| 53 | <tr>
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| 54 | <th>Expression</th>
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| 55 | <td><input type="text" id="expr"/></td>
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| 56 | </tr>
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| 57 | <tr>
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| 58 | <th>Pretty print</th>
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| 59 | <td><div id="pretty"></div></td>
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| 60 | </tr>
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| 61 | <tr>
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| 62 | <th>Result</th>
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| 63 | <td><div id="result"></div></td>
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| 64 | </tr>
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| 65 | </table>
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| 66 | <b>Parenthesis option:</b>
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| 67 | <input type="radio" name="parenthesis" value="keep" onclick="parenthesis = 'keep'; expr.oninput();" checked>keep
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| 68 | <input type="radio" name="parenthesis" value="auto" onclick="parenthesis = 'auto'; expr.oninput();">auto
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| 69 | <input type="radio" name="parenthesis" value="all" onclick="parenthesis = 'all'; expr.oninput();">all
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| 70 | <br/>
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| 71 | <b>Implicit multiplication:</b>
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| 72 | <input type="radio" name="implicit" value="hide" onclick="implicit = 'hide'; expr.oninput();" checked>hide
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| 73 | <input type="radio" name="implicit" value="show" onclick="implicit = 'show'; expr.oninput();">show
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| 74 |
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| 75 |
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| 76 | <script>
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| 77 | const expr = document.getElementById('expr')
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| 78 | const pretty = document.getElementById('pretty')
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| 79 | const result = document.getElementById('result')
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| 80 | let parenthesis = 'keep'
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| 81 | let implicit = 'hide'
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| 82 |
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| 83 | const mj = function (tex) {
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| 84 | return MathJax.tex2svg(tex, {em: 16, ex: 6, display: false});
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| 85 | }
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| 86 |
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| 87 |
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| 88 | expr.value = 'sqrt(75 / 3) + det([[-1, 2], [3, 1]]) - sin(pi / 4)^2'
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| 89 | pretty.innerHTML = '';
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| 90 | pretty.appendChild(mj(math.parse(expr.value).toTex({parenthesis: parenthesis})));
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| 91 | result.innerHTML = math.format(math.evaluate(expr.value))
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| 92 |
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| 93 | expr.oninput = function () {
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| 94 | let node = null
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| 95 |
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| 96 | try {
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| 97 |
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| 98 | node = math.parse(expr.value)
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| 99 |
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| 100 |
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| 101 | result.innerHTML = math.format(node.compile().evaluate())
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| 102 | }
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| 103 | catch (err) {
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| 104 | result.innerHTML = '<span style="color: red;">' + err.toString() + '</span>'
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| 105 | }
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| 106 |
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| 107 | try {
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| 108 |
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| 109 | const latex = node ? node.toTex({parenthesis: parenthesis, implicit: implicit}) : ''
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| 110 | console.log('LaTeX expression:', latex)
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| 111 |
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| 112 |
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| 113 | MathJax.typesetClear();
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| 114 | pretty.innerHTML = '';
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| 115 | pretty.appendChild(mj(latex));
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| 116 | }
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| 117 | catch (err) {}
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| 118 | }
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| 119 | </script>
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| 120 |
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| 121 | </body>
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| 122 | </html>
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