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{{ if .Params.toc }}
<div id="toc-container"><div id="toc">{{ .TableOfContents }}</div></div>
<style>
/* toc */
#toc-container {
position: absolute;
bottom: 0;
right: calc(50% + var(--page-width) / 2);
left: auto;
height: 100%;
top: 12rem;
@media screen and (max-width: 1200px) {
display: none
}
}
#toc {
/* position */
position: sticky;
top: 3rem;
/* styling */
font-size: 1rem;
padding: 0 2rem;
@media screen and (max-width: 1500px) {
font-size: 0.825rem;
}
ul {
margin-block-start: 0;
margin-block-end: 0;
padding-inline-start: 1rem;
overflow: hidden;
position: relative;
li {
list-style: none;
& > a {
color: var(--secondary-text-color);
text-decoration: none;
transition: color .3s;
display: inline-flex;
align-items: center;
gap: .5rem;
&::before {
content: '';
display: inline-block;
width: 1rem;
height: .3rem;
background-color: var(--block-background-color);
border-radius: .2rem;
transition: background .3s;
}
}
/* nested list */
ul {
max-height: 25rem;
overflow-y: auto
}
/* active styles */
&:not(.active) ul {
max-height: 0
}
a:hover,
&.active > a {
color: var(--text-color);
}
&.active > a::before {
background-color: var(--secondary-text-color);
}
}
}
}
</style>
<script>
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));
});
</script>
{{ end }}
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