MathJax / Bryan Gin-ge Chen

Bryan Gin-ge Chen

here to learn

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Published

Edited

Jul 8, 2019

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10 stars

MathJax = require("https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/MathJax.js?config=TeX-AMS_CHTML")

.catch(() => window.MathJax)

.then(MathJax => {

MathJax.Hub.Config({

CommonHTML: { scale: 110 }, // scaling to get the same size as katex (but katex still has more spacing between lines...)

tex2jax: { inlineMath: [["$", "$"], ["\$", "\$"]] },

displayMath: [["$$", "$$"], ["\\[", "\\]"]],

processEscapes: true,

TeX: { extensions: ["autoload-all.js"] },

});

return new Promise(resolve =>

MathJax.Hub.Register.StartupHook("End", () => resolve(MathJax))

);

})

mjCSS = html`<style id='observable-mathjax-style'>

.MJXc-display {

max-width: 640px;

}

</style>`

function mj() {

const raw = String.raw(...arguments);

if (!document.getElementById('observable-mathjax-style'))

document.body.appendChild(mjCSS);

// hack to autoload AMScd if necessary

// (won't be necessary in MathJax v3: https://github.com/mathjax/mathjax-v3/pull/235)

if (!document.getElementById('mathjax-amscd') && /\\begin\{CD\}/.test(raw)) {

MathJax.Hub.Queue(["Typeset", MathJax.Hub, document.body.appendChild(

html`<div id='mathjax-amscd' style='display: none;'>$\\require{AMScd}$`)]);

}

const elem = document.body.appendChild(html`<span>${raw}`);

return new Promise(resolve => MathJax.Hub.Queue(["Typeset", MathJax.Hub, elem, () => resolve(document.body.removeChild(elem))]));

}

mj`$$\beta(z) = \int_0^\infty \frac{t^{z-1}}{e^{-t}dt}\,$$`

tex.block`\beta(z) = \int_0^\infty \frac{t^{z-1}}{e^{-t}dt}\,`

mj`\begin{align}

F_0 &= 1\\

F_1 &= 1\\

F_n &= F_{n-1} + F_{n-2}, \quad n>1

\end{align}`

tex.block`

\begin{aligned}

F_0 &= 1\\

F_1 &= 1\\

F_n &= F_{n-1} + F_{n-2}, \quad n>1

\end{aligned}

md`This is a markdown cell with embedded MathJax:

${await mj`$$\Gamma(z) = \int_0^\infty t^{z-1}e^{-t}dt\,.$$`}`

md`Here's a matrix, sitting nicely inline: ${await mj`$\begin{pmatrix}

a & b \\

c & c

\end{pmatrix}$`}`

md`The [\`autoload-all.js\` extension](http://docs.mathjax.org/en/latest/tex.html?highlight=autoload#autoload-all) is enabled, so the [\`\\bbox\` macro](http://docs.mathjax.org/en/latest/tex.html?highlight=autoload#bbox) "just works":

${await mj`$\bbox[pink]{x+y}$`}

md`Here's a little commutative diagram using the [\`AMScd\` package](https://ctan.org/pkg/amscd):

${await mj`\begin{CD}

A @>a>> B\\

@V b V V @VV c V\\

C @>>d> D

\end{CD}`}

Ordinarily you would have to write \`$\\require{AMScd}$\` somewhere before the diagram to load the extension, but the \`mj\` function autoloads it for you. This feature was included because it seems that including an explicit \`$\\require{AMScd}$\` declaration leads to undesirable extra spacing before the diagram:

${await mj`$\require{AMScd}$\begin{CD}

E @>e>> F @>f>> G\\

@V g V V @VV h V @VV i V\\

G @>>j> H @>>k> I

\end{CD}`}

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