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// This file is part of Moodle - http://moodle.org/ // // Moodle is free software: you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation, either version 3 of the License, or // (at your option) any later version. // // Moodle is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with Moodle. If not, see <http://www.gnu.org/licenses/>. /** * Mathjax JS Loader. * * @module filter_mathjaxloader/loader * @copyright 2014 Damyon Wiese <damyon@moodle.com> * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later / import { eventTypes, notifyFilterContentRenderingComplete, } from 'core_filters/events'; /* * The users current language - this can't be set until MathJax is loaded - so we need to store it. * @property {string} lang * @default '' * @private / let lang = ''; /* * Used to prevent configuring MathJax twice. * @property {boolean} configured * @default false * @private / let configured = false; /* * Called by the filter when it is active on any page. * This does not load MathJAX yet - it addes the configuration to the head incase it gets loaded later. * It also subscribes to the filter-content-updated event so MathJax can respond to content loaded by Ajax. * * @param {Object} params List of configuration params containing mathjaxconfig (text) and lang / export const configure = (params) => { // Add a js configuration object to the head. // See "https://docs.mathjax.org/en/v2.7-latest/advanced/dynamic.html" const script = document.createElement("script"); script.type = "text/x-mathjax-config"; script[(window.opera ? "innerHTML" : "text")] = params.mathjaxconfig; document.getElementsByTagName("head")[0].appendChild(script); // Save the lang config until MathJax is actually loaded. lang = params.lang; // Listen for events triggered when new text is added to a page that needs // processing by a filter. document.addEventListener(eventTypes.filterContentUpdated, contentUpdated); }; /* * Set the correct language for the MathJax menus. Only do this once. * * @private / const setLocale = () => { if (!configured) { if (typeof window.MathJax !== "undefined") { window.MathJax.Hub.Queue(function() { window.MathJax.Localization.setLocale(lang); }); window.MathJax.Hub.Configured(); configured = true; } } }; /* * Add the node to the typeset queue. * * @param {HTMLElement} node The Node to be processed by MathJax * @private / const typesetNode = (node) => { if (!(node instanceof HTMLElement)) { // We may have been passed a #text node. // These cannot be formatted. return; } // MathJax 2.X does not notify when complete. The best we can do, according to their docs, is to queue a callback. // See https://docs.mathjax.org/en/v2.7-latest/advanced/typeset.html // Note that the MathJax.Hub.Queue() method will return immediately, regardless of whether the typesetting has taken place // or not, so you can not assume that the mathematics is visible after you make this call. // That means that things like the size of the container for the mathematics may not yet reflect the size of the // typeset mathematics. If you need to perform actions that depend on the mathematics being typeset, you should push those // actions onto the MathJax.Hub.queue as well. window.MathJax.Hub.Queue(["Typeset", window.MathJax.Hub, node]); window.MathJax.Hub.Queue([(node) => { // The notifyFilterContentRenderingComplete event takes an Array of NodeElements or a NodeList. // We cannot create a NodeList so we use an HTMLElement[]. notifyFilterContentRenderingComplete([node]); }, node]); }; /* * Called by the filter when an equation is found while rendering the page. / export const typeset = () => { if (!configured) { setLocale(); const elements = document.getElementsByClassName('filter_mathjaxloader_equation'); for (const element of elements) { if (typeof window.MathJax !== "undefined") { typesetNode(element); } } } }; /* * Handle content updated events - typeset the new content. * * @param {CustomEvent} event - Custom event with "nodes" indicating the root of the updated nodes. */ export const contentUpdated = (event) => { if (typeof window.MathJax === "undefined") { return; } let listOfElementContainMathJax = []; let hasMathJax = false; // The list of HTMLElements in an Array. event.detail.nodes.forEach((node) => { if (!(node instanceof HTMLElement)) { // We may have been passed a #text node. return; } const mathjaxElements = node.querySelectorAll('.filter_mathjaxloader_equation'); if (mathjaxElements.length > 0) { hasMathJax = true; } listOfElementContainMathJax.push(mathjaxElements); }); if (!hasMathJax) { return; } const processDelay = window.MathJax.Hub.processSectionDelay; // Set the process section delay to 0 when updating the formula. window.MathJax.Hub.processSectionDelay = 0; // When content is updated never position to hash, it may cause unexpected document scrolling. window.MathJax.Hub.Config({positionToHash: false}); setLocale(); listOfElementContainMathJax.forEach((mathjaxElements) => { mathjaxElements.forEach((node) => typesetNode(node)); }); window.MathJax.Hub.processSectionDelay = processDelay; };

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