52 lines
1.1 KiB
JavaScript
52 lines
1.1 KiB
JavaScript
/* 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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// Only load once
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let katexLoaded = false;
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// Loop over all math elements and render math
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function renderWithKaTeX(elements) {
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elements.each(function katexElementsLoop() {
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const mathNode = $('<span></span>');
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const $this = $(this);
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const 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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throw err;
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}
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});
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}
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export default function renderMath($els) {
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if (!$els.length) return;
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if (katexLoaded) {
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renderWithKaTeX($els);
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} else {
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$.get(gon.katex_css_url, () => {
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const 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, () => {
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katexLoaded = true;
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renderWithKaTeX($els); // Run KaTeX
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});
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});
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}
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}
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