diff options
Diffstat (limited to 'app/assets/javascripts/render_math.js')
-rw-r--r-- | app/assets/javascripts/render_math.js | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/app/assets/javascripts/render_math.js b/app/assets/javascripts/render_math.js new file mode 100644 index 00000000000..6cef449babf --- /dev/null +++ b/app/assets/javascripts/render_math.js @@ -0,0 +1,54 @@ +/* eslint-disable func-names, space-before-function-paren, consistent-return, no-var, no-undef, no-else-return, prefer-arrow-callback, max-len, no-console */ +// Renders math using KaTeX in any element with the +// `js-render-math` class +// +// ### Example Markup +// +// <code class="js-render-math"></div> +// +(function() { + // Only load once + var katexLoaded = false; + + // Loop over all math elements and render math + var renderWithKaTeX = function (elements) { + elements.each(function () { + var mathNode = $('<span></span>'); + var $this = $(this); + + var display = $this.attr('data-math-style') === 'display'; + try { + katex.render($this.text(), mathNode.get(0), { displayMode: display }); + mathNode.insertAfter($this); + $this.remove(); + } catch (err) { + // What can we do?? + console.log(err.message); + } + }); + }; + + $.fn.renderMath = function() { + var $this = this; + if ($this.length === 0) return; + + if (katexLoaded) renderWithKaTeX($this); + else { + // Request CSS file so it is in the cache + $.get(gon.katex_css_url, function() { + var css = $('<link>', + { rel: 'stylesheet', + type: 'text/css', + href: gon.katex_css_url, + }); + css.appendTo('head'); + + // Load KaTeX js + $.getScript(gon.katex_js_url, function() { + katexLoaded = true; + renderWithKaTeX($this); // Run KaTeX + }); + }); + } + }; +}).call(this); |