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// Animate Hugo-built TOC
// author: Eltrac
document.addEventListener('DOMContentLoaded', () => {
const toc = document.getElementById('toc');
if (!toc) return;
const headings = document.querySelectorAll('h2, h3');
const observer = new IntersectionObserver(entries => {
entries.forEach(entry => {
if (!entry.isIntersecting) return;
const id = entry.target.id;
const tocLink = toc.querySelector(`a[href="#${id}"]`);
if (!tocLink) return;
const listItem = tocLink.parentElement;
const isH2 = entry.target.tagName === 'H2';
// Clear all active states when a new H2 is encountered
if (isH2) {
toc.querySelectorAll('li.active').forEach(el => el.classList.remove('active'));
}
// Set current item as active
listItem.classList.add('active');
// If this is an H3, find and activate its parent H2
if (!isH2) {
const parentH2Item = listItem.closest('ul').previousElementSibling?.closest('li');
if (parentH2Item) parentH2Item.classList.add('active');
}
});
}, {
rootMargin: '0px 0px -50% 0px',
threshold: 0.5
});
headings.forEach(heading => observer.observe(heading));
});
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