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Fix sticky top button behavior

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Vinta Chen
2026-03-22 14:17:17 +08:00
parent 39a2abbfcc
commit 3e7ff12614
2 changed files with 25 additions and 3 deletions
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24
website/static/main.js
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@@ -312,20 +312,40 @@ if (searchInput) {
// Back to top
var backToTop = document.querySelector('.back-to-top');
var resultsSection = document.querySelector('#library-index');
var tableWrap = document.querySelector('.table-wrap');
var stickyHeaderCell = backToTop ? backToTop.closest('th') : null;
function updateBackToTopVisibility() {
if (!backToTop || !tableWrap || !stickyHeaderCell) return;
var tableRect = tableWrap.getBoundingClientRect();
var headRect = stickyHeaderCell.getBoundingClientRect();
var hasPassedHeader = tableRect.top <= 0 && headRect.bottom > 0;
backToTop.classList.toggle('visible', hasPassedHeader);
}
if (backToTop) {
var scrollTicking = false;
window.addEventListener('scroll', function () {
if (!scrollTicking) {
requestAnimationFrame(function () {
backToTop.classList.toggle('visible', window.scrollY > 600);
updateBackToTopVisibility();
scrollTicking = false;
});
scrollTicking = true;
}
});
window.addEventListener('resize', updateBackToTopVisibility);
backToTop.addEventListener('click', function () {
window.scrollTo({ top: 0, behavior: 'smooth' });
if (!resultsSection) return;
resultsSection.scrollIntoView({ behavior: 'smooth', block: 'start' });
});
updateBackToTopVisibility();
}
// Restore state from URL