89 lines
2 KiB
JavaScript
89 lines
2 KiB
JavaScript
/**
|
|
* A plugin which enables rendering of math equations inside
|
|
* of reveal.js slides. Essentially a thin wrapper for MathJax.
|
|
*
|
|
* @author Hakim El Hattab
|
|
*/
|
|
export const MathJax2 = () => {
|
|
|
|
// The reveal.js instance this plugin is attached to
|
|
let deck;
|
|
|
|
let defaultOptions = {
|
|
messageStyle: 'none',
|
|
tex2jax: {
|
|
inlineMath: [ [ '$', '$' ], [ '\\(', '\\)' ] ],
|
|
skipTags: [ 'script', 'noscript', 'style', 'textarea', 'pre' ]
|
|
},
|
|
skipStartupTypeset: true
|
|
};
|
|
|
|
function loadScript( url, callback ) {
|
|
|
|
let head = document.querySelector( 'head' );
|
|
let script = document.createElement( 'script' );
|
|
script.type = 'text/javascript';
|
|
script.src = url;
|
|
|
|
// Wrapper for callback to make sure it only fires once
|
|
let finish = () => {
|
|
if( typeof callback === 'function' ) {
|
|
callback.call();
|
|
callback = null;
|
|
}
|
|
}
|
|
|
|
script.onload = finish;
|
|
|
|
// IE
|
|
script.onreadystatechange = () => {
|
|
if ( this.readyState === 'loaded' ) {
|
|
finish();
|
|
}
|
|
}
|
|
|
|
// Normal browsers
|
|
head.appendChild( script );
|
|
|
|
}
|
|
|
|
return {
|
|
id: 'mathjax2',
|
|
|
|
init: function( reveal ) {
|
|
|
|
deck = reveal;
|
|
|
|
let revealOptions = deck.getConfig().mathjax2 || deck.getConfig().math || {};
|
|
|
|
let options = { ...defaultOptions, ...revealOptions };
|
|
let mathjax = options.mathjax || 'https://cdn.jsdelivr.net/npm/mathjax@2/MathJax.js';
|
|
let config = options.config || 'TeX-AMS_HTML-full';
|
|
let url = mathjax + '?config=' + config;
|
|
|
|
options.tex2jax = { ...defaultOptions.tex2jax, ...revealOptions.tex2jax };
|
|
|
|
options.mathjax = options.config = null;
|
|
|
|
loadScript( url, function() {
|
|
|
|
MathJax.Hub.Config( options );
|
|
|
|
// Typeset followed by an immediate reveal.js layout since
|
|
// the typesetting process could affect slide height
|
|
MathJax.Hub.Queue( [ 'Typeset', MathJax.Hub, deck.getRevealElement() ] );
|
|
MathJax.Hub.Queue( deck.layout );
|
|
|
|
// Reprocess equations in slides when they turn visible
|
|
deck.on( 'slidechanged', function( event ) {
|
|
|
|
MathJax.Hub.Queue( [ 'Typeset', MathJax.Hub, event.currentSlide ] );
|
|
|
|
} );
|
|
|
|
} );
|
|
|
|
}
|
|
}
|
|
|
|
};
|