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/**
* A plugin which enables rendering of math equations inside
* of reveal.js slides. Essentially a thin wrapper for MathJax.
*
* @author Hakim El Hattab
*/
var RevealMath = window.RevealMath || (function () {
var options = Reveal.getConfig().math || {};
var mathjax = options.mathjax || 'https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/MathJax.js';
var config = options.config || 'TeX-AMS_HTML-full';
var url = mathjax + '?config=' + config;
var defaultOptions = {
messageStyle: 'none',
tex2jax: {
inlineMath: [['$', '$'], ['\\(', '\\)']],
skipTags: ['script', 'noscript', 'style', 'textarea', 'pre']
},
skipStartupTypeset: true
};
function defaults(options, defaultOptions) {
for (var i in defaultOptions) {
if (!options.hasOwnProperty(i)) {
options[i] = defaultOptions[i];
}
}
}
function loadScript(url, callback) {
var head = document.querySelector('head');
var script = document.createElement('script');
script.type = 'text/javascript';
script.src = url;
// Wrapper for callback to make sure it only fires once
var finish = function () {
if (typeof callback === 'function') {
callback.call();
callback = null;
}
};
script.onload = finish;
// IE
script.onreadystatechange = function () {
if (this.readyState === 'loaded') {
finish();
}
};
// Normal browsers
head.appendChild(script);
}
return {
init: function () {
defaults(options, defaultOptions);
defaults(options.tex2jax, defaultOptions.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]);
MathJax.Hub.Queue(Reveal.layout);
// Reprocess equations in slides when they turn visible
Reveal.addEventListener('slidechanged', function (event) {
MathJax.Hub.Queue(['Typeset', MathJax.Hub, event.currentSlide]);
});
});
}
}
})();
Reveal.registerPlugin('math', RevealMath);
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