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MathJax: use shadow DOM, wait for content

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Arne Keller 2021-01-28 17:50:56 +01:00
parent 5ed813133c
commit cfec25c566
1 changed files with 89 additions and 20 deletions
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109
frontend/src/mathjax-setup.js
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@ -6,27 +6,89 @@ window.MathJax = {
},
startup: {
ready: () => {
const mathjax = MathJax._.mathjax.mathjax;
const HTMLAdaptor = MathJax._.adaptors.HTMLAdaptor.HTMLAdaptor;
const HTMLHandler = MathJax._.handlers.html.HTMLHandler.HTMLHandler;
const AbstractHandler = MathJax._.core.Handler.AbstractHandler.prototype;
const startup = MathJax.startup;
//
// Extend HTMLAdaptor to handle shadowDOM as the document
//
class ShadowAdaptor extends HTMLAdaptor {
create(kind, ns) {
const document = (this.document.createElement ? this.document : this.window.document);
return (ns ?
document.createElementNS(ns, kind) :
document.createElement(kind));
}
text(text) {
const document = (this.document.createTextNode ? this.document : this.window.document);
return document.createTextNode(text);
}
head(doc) {
return doc.head || (doc.getElementById("mjx-document") || {}).firstChild || doc;
}
body(doc) {
return doc.body || (doc.getElementById("mjx-document") || {}).lastChild || doc;
}
root(doc) {
return doc.documentElement || doc.getElementById("mjx-document") || doc;
}
}
//
// Extend HTMLHandler to handle shadowDOM as document
//
class ShadowHandler extends HTMLHandler {
create(document, options) {
const adaptor = this.adaptor;
if (typeof (document) === 'string') {
document = adaptor.parse(document, 'text/html');
} else if ((document instanceof adaptor.window.HTMLElement ||
document instanceof adaptor.window.DocumentFragment) &&
!(document instanceof window.ShadowRoot)) {
let child = document;
document = adaptor.parse('', 'text/html');
adaptor.append(adaptor.body(document), child);
}
//
// We can't use super.create() here, since that doesn't
// handle shadowDOM correctly, so call HTMLHandler's parent class
// directly instead.
//
return AbstractHandler.create.call(this, document, options);
}
}
//
// Register the new handler and adaptor
//
startup.registerConstructor('HTMLHandler', ShadowHandler);
startup.registerConstructor('browserAdaptor', () => new ShadowAdaptor(window));
//
// A service function that creates a new MathDocument from the
// shadow root with the configured input and output jax, and then
// renders the document. The MathDocument is returned in case
// you need to rerender the shadowRoot later.
//
MathJax.typesetShadow = function (root, callback) {
setTimeout(() => {
let tex = root.getElementById("tc-content").innerText;
root.getElementById("tc-content").innerText = "";
MathJax.tex2svgPromise(tex, options).then(function (node) {
console.log(node);
//
// The promise returns the typeset node, which we add to the output
// Then update the document to include the adjusted CSS for the
// content of the new equation.
//
root.appendChild(node);
MathJax.startup.document.clear();
MathJax.startup.document.updateDocument();
// TODO: findSteps(node);
}).catch(function (err) {
//
// If there was an error, put the message into the output instead
//
root.appendChild(document.createElement('pre')).appendChild(document.createTextNode(err.message));
});}, 1); // TODO: remove the delay?
if (root.getElementById("tc-content") == null) {
return;
}
const InputJax = startup.getInputJax();
const OutputJax = startup.getOutputJax();
const html = mathjax.document(root, {InputJax, OutputJax});
html.render();
if (callback != null) {
callback(html);
}
return html;
}
//
@ -46,3 +108,10 @@ window.MathJax = {
}
}
};
(function () {
let script = document.createElement('script');
script.src = 'http://cdn.jsdelivr.net/npm/mathjax@3.1.2/es5/tex-svg.js';
// script.async = true;
document.head.appendChild(script);
})();