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Add support for BS ScrollSpy to show active TOC entry #2287

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Merged
chalin merged 2 commits into from
Jun 13, 2025
Merged

Add support for BS ScrollSpy to show active TOC entry #2287

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d9a011c
Add support for BS ScrollSpy to show active TOC entry
chalin Jun 13, 2025
a12acc1
Update _sidebar-toc.scss: use SCSS var
chalin Jun 13, 2025
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41 changes: 36 additions & 5 deletions assets/scss/_sidebar-toc.scss
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,11 @@
}

.td-toc {
$toc-padding-base: 1rem;
$toc-padding-increment: 0.5rem; // for TOC entry nesting

margin-top: 1rem;

a {
display: block;
font-weight: $font-weight-light;
Expand All @@ -36,23 +41,49 @@
display: block;
}

li li {
margin-left: 0.5rem;
> .toc-title {
font-weight: $font-weight-bold;
color: var(--bs-secondary-color);
border-bottom: 1px solid var(--bs-tertiary-color);
padding-bottom: 0.5rem;
margin-bottom: 0.5rem;
}

#TableOfContents {
// Hugo's ToC is a mouthful, this can be used to style the top level h2 entries.
> ul > li > ul > li > a {
}
margin-left: -0.75rem;

a {
margin-left: 0;
padding-left: $toc-padding-base;
text-decoration: none;
border-left: .125rem solid transparent;
transition: color 0.15s ease-in-out, border-color 0.15s ease-in-out;
color: var(--bs-secondary-color);

&.active {
color: var(--bs-primary);
border-left-color: var(--bs-primary);
font-weight: $font-weight-medium;
}

&:focus,
&:hover {
color: initial;
}
}

ul ul a {
padding-left: $toc-padding-base + $toc-padding-increment;
}
ul ul ul a {
padding-left: $toc-padding-base + ($toc-padding-increment * 2);
}
ul ul ul ul a {
padding-left: $toc-padding-base + ($toc-padding-increment * 3);
}
ul ul ul ul ul a {
padding-left: $toc-padding-base + ($toc-padding-increment * 4);
}
}

ul {
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4 changes: 4 additions & 0 deletions layouts/_partials/td/scroll-spy-attr.txt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,4 @@
data-bs-spy="scroll" {{/**/ -}}
data-bs-target="#TableOfContents" {{/**/ -}}
data-bs-smooth-scroll="true" {{/**/ -}}
data-bs-root-margin="0px 0px -40%" {{/**/ -}}
1 change: 1 addition & 0 deletions layouts/_partials/toc.html
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@
{{ with .TableOfContents -}}
{{ if ne . `<nav id="TableOfContents"></nav>` -}}
<div class="td-toc">
<div class="toc-title">On this page</div>
{{ . }}
</div>
{{ end -}}
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2 changes: 1 addition & 1 deletion layouts/blog/baseof.html
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Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,7 @@
{{ partial "navbar.html" . }}
</header>
<div class="container-fluid td-outer">
<div class="td-main">
<div class="td-main" {{ partialCached "td/scroll-spy-attr.txt" . | safeHTMLAttr }}>
<div class="row flex-xl-nowrap">
<aside class="col-12 col-md-3 col-xl-2 td-sidebar d-print-none">
{{ partial "sidebar.html" . }}
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2 changes: 1 addition & 1 deletion layouts/docs/baseof.html
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Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,7 @@
{{ partial "navbar.html" . }}
</header>
<div class="container-fluid td-outer">
<div class="td-main">
<div class="td-main" {{ partialCached "td/scroll-spy-attr.txt" . | safeHTMLAttr }}>
<div class="row flex-xl-nowrap">
<aside class="col-12 col-md-3 col-xl-2 td-sidebar d-print-none">
{{ partial "sidebar.html" . }}
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