diff options
Diffstat (limited to 'presentation/plugin/math/math.js')
-rwxr-xr-x | presentation/plugin/math/math.js | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/presentation/plugin/math/math.js b/presentation/plugin/math/math.js new file mode 100755 index 0000000..d76c9dd --- /dev/null +++ b/presentation/plugin/math/math.js @@ -0,0 +1,92 @@ +/** + * 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 ); |