78 lines
2.2 KiB
JavaScript
78 lines
2.2 KiB
JavaScript
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/**
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* A plugin which enables rendering of math equations inside
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* of reveal.js slides. Essentially a thin wrapper for MathJax 3
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*
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* @author Hakim El Hattab
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* @author Gerhard Burger
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*/
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export const MathJax3 = () => {
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// The reveal.js instance this plugin is attached to
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let deck;
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let defaultOptions = {
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tex: {
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inlineMath: [ [ '$', '$' ], [ '\\(', '\\)' ] ]
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},
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options: {
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skipHtmlTags: [ 'script', 'noscript', 'style', 'textarea', 'pre' ]
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},
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startup: {
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ready: () => {
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MathJax.startup.defaultReady();
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MathJax.startup.promise.then(() => {
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deck.layout();
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});
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}
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}
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};
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function loadScript( url, callback ) {
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let script = document.createElement( 'script' );
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script.type = "text/javascript"
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script.id = "MathJax-script"
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script.src = url;
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script.async = true
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// Wrapper for callback to make sure it only fires once
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script.onload = () => {
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if (typeof callback === 'function') {
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callback.call();
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callback = null;
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}
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};
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document.head.appendChild( script );
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}
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return {
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id: 'mathjax3',
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init: function(reveal) {
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deck = reveal;
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let revealOptions = deck.getConfig().mathjax3 || {};
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let options = {...defaultOptions, ...revealOptions};
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options.tex = {...defaultOptions.tex, ...revealOptions.tex}
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options.options = {...defaultOptions.options, ...revealOptions.options}
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options.startup = {...defaultOptions.startup, ...revealOptions.startup}
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let url = options.mathjax || 'https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js';
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options.mathjax = null;
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window.MathJax = options;
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loadScript( url, function() {
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// Reprocess equations in slides when they turn visible
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deck.addEventListener( 'slidechanged', function( event ) {
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MathJax.typeset();
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} );
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} );
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}
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}
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};
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