Skip to content

Alternate approach to delaying showing problem content until after MathJax content has rendered. #3021

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
drgrice1 wants to merge 1 commit into
base: WeBWorK-2.21
Choose a base branch
from
+43 −0
Open

Alternate approach to delaying showing problem content until after MathJax content has rendered. #3021

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
43 changes: 43 additions & 0 deletions htdocs/js/MathJaxConfig/mathjax-config.js
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,4 +1,6 @@
if (!window.MathJax) {
const problems = [];

window.MathJax = {
tex: { packages: { '[+]': webworkConfig?.showMathJaxErrors ? [] : ['noerrors'] } },
loader: {
Expand Down Expand Up @@ -103,6 +105,16 @@ if (!window.MathJax) {

MathJax.startup.defaultReady();
MathJax.startup.document.constructor.ProcessBits.allocate('findScripts');
},
pageReady() {
return MathJax.startup.defaultPageReady().then(() => {
for (const [problemContent, loaderOverlay, resizeObserver] of problems) {
resizeObserver.disconnect();
loaderOverlay.remove();
problemContent.style.visibility = '';
}
problems.length = 0;
});
}
},
options: {
Expand Down Expand Up @@ -134,4 +146,35 @@ if (!window.MathJax) {
ignoreHtmlClass: 'tex2jax_ignore'
}
};

for (const problemContent of document.querySelectorAll('.problem-content')) {
problemContent.style.visibility = 'hidden';
const loaderOverlay = document.createElement('div');
loaderOverlay.classList.add('problem-content');
const bodyRectangle = problemContent.getBoundingClientRect();
loaderOverlay.style.position = 'absolute';
loaderOverlay.style.top = `${bodyRectangle.y}px`;
loaderOverlay.style.left = `${bodyRectangle.x}px`;
loaderOverlay.style.width = `${bodyRectangle.width}px`;
loaderOverlay.style.height = `${bodyRectangle.height}px`;
loaderOverlay.style.overflow = 'clip';
loaderOverlay.style.transition = 'height 0.3s ease';
loaderOverlay.animate([{ opacity: 1 }, { opacity: 0.2 }, { opacity: 1 }], {
duration: 2000,
iterations: Infinity,
easing: 'ease-in-out'
});
loaderOverlay.style.cursor = 'wait';

problemContent.after(loaderOverlay);
const resizeObserver = new ResizeObserver(() => {
const bodyRectangle = problemContent.getBoundingClientRect();
loaderOverlay.style.top = `${bodyRectangle.top}px`;
loaderOverlay.style.left = `${bodyRectangle.left}px`;
loaderOverlay.style.width = `${bodyRectangle.width}px`;
loaderOverlay.style.height = `${bodyRectangle.height}px`;
});
resizeObserver.observe(problemContent);
problems.push([problemContent, loaderOverlay, resizeObserver]);
}
}