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fix: improve underlining in "On this page" #1312

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fix: improve underlining in "On this page" #1312

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722be43
Remove no-longer-needed :global
zqianem Apr 18, 2025
85ecbb2
Make anchor underlines react better to clicks
zqianem Apr 18, 2025
ad8708b
Merge branch 'main' into fix-anchor-link-update
teemingc Jul 31, 2025
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37 changes: 23 additions & 14 deletions apps/svelte.dev/src/routes/docs/[topic]/[...path]/OnThisPage.svelte
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Original file line number Diff line number Diff line change
Expand Up @@ -6,17 +6,28 @@

let headings: NodeListOf<HTMLHeadingElement>;
let current = $state('');
let locked = $state(false);

afterNavigate(() => {
current = location.hash.slice(1);
headings = content.querySelectorAll('h2');
update(); // Ensure active link is set correctly on navigation
for (const heading of headings) {
const anchor = heading.querySelector('a');
if (anchor) anchor.onclick = onclick;
}
onclick();
});

// Update function to activate the correct section link
function update() {
function onclick() {
current = location.hash.slice(1);
// avoid onscroll handler from inaccurately updating
locked = true;
setTimeout(() => (locked = false), 100);
}

function onscroll() {
if (locked) return;

const threshold = (innerHeight * 1) / 3;
let found = false;

for (let i = 0; i < headings.length; i++) {
const heading = headings[i];
Expand All @@ -28,19 +39,18 @@
(!next || next.getBoundingClientRect().top > threshold)
) {
current = heading.id;
found = true;
break;
}
}

// Handle case when scrolled to the top of the page
if (!found && scrollY === 0) {
if (scrollY === 0) {
current = '';
}
}
</script>

<svelte:window onscroll={update} onhashchange={() => (current = location.hash.slice(1))} />
<svelte:window {onscroll} onhashchange={onclick} />

<aside class="on-this-page">
<label>
Expand All @@ -51,14 +61,15 @@
<nav>
<ul>
<li>
<a href="/{document.slug}" class:active={current === ''}>
<a href="/{document.slug}" class:active={current === ''} {onclick}>
{document.metadata.title}
</a>
</li>

{#each document.sections as section}
<li>
<a href="#{section.slug}" class:active={current === section.slug}>{@html section.title}</a
<a href="#{section.slug}" class:active={current === section.slug} {onclick}
>{@html section.title}</a
>
</li>
{/each}
Expand Down Expand Up @@ -89,8 +100,7 @@
@media (max-width: 1199px) {
margin: 4rem 0;

/* TODO remove :global once https://github.com/sveltejs/svelte/issues/13779 is fixed */
:global(&:not(:has(li:nth-child(2)))) {
&:not(:has(li:nth-child(2))) {
/* hide widget if there are no subheadings */
display: none;
}
Expand Down Expand Up @@ -165,8 +175,7 @@
rotate: 90deg;
}

/* TODO remove :global once https://github.com/sveltejs/svelte/issues/13779 is fixed */
:global(& + nav) {
& + nav {
display: block;
}
}
Expand Down