57 lines
1.5 KiB
JavaScript
57 lines
1.5 KiB
JavaScript
/* eslint-disable func-names, space-before-function-paren, consistent-return, no-var, no-else-return, prefer-arrow-callback, max-len, no-console */
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/* global katex */
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// Renders math using KaTeX in any element with the
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// `js-render-math` class
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//
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// ### Example Markup
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//
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// <code class="js-render-math"></div>
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//
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(function() {
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// Only load once
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var katexLoaded = false;
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// Loop over all math elements and render math
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var renderWithKaTeX = function (elements) {
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elements.each(function () {
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var mathNode = $('<span></span>');
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var $this = $(this);
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var display = $this.attr('data-math-style') === 'display';
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try {
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katex.render($this.text(), mathNode.get(0), { displayMode: display });
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mathNode.insertAfter($this);
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$this.remove();
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} catch (err) {
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// What can we do??
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console.log(err.message);
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}
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});
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};
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$.fn.renderMath = function() {
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var $this = this;
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if ($this.length === 0) return;
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if (katexLoaded) renderWithKaTeX($this);
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else {
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// Request CSS file so it is in the cache
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$.get(gon.katex_css_url, function() {
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var css = $('<link>',
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{ rel: 'stylesheet',
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type: 'text/css',
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href: gon.katex_css_url,
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});
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css.appendTo('head');
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// Load KaTeX js
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$.getScript(gon.katex_js_url, function() {
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katexLoaded = true;
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renderWithKaTeX($this); // Run KaTeX
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});
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});
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}
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};
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}).call(window);
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