GitBook plugin: InTopic TOC
This GitBook plugin adds an inline table of contents (TOC) to each page based on configurable selectors. Inline TOC can be enabled or disabled by default or on individual pages. TOC is placed on the right side and moves to top for smaller devices automatically.
Inline TOC stays at the top of the page when scrolling using a sticky effect. Current position is highlighted by a scrollspy effect.
Plugin uses gumshoe and anchorjs to implement functionality.
Installation
Step #1 - Update book.json file
- In you gitbook's book.json file, add
intopic-toc
to plugins list. - In pluginsConfig, configure the plugin so it does fit your needs. A custom setup is not mandatory.
Sample book.json
file for gitbook version 2.0.0+
{
"plugins": [
"intopic-toc"
]
}
Sample book.json
file for gitbook version 2.0.0+ and custom heading
{
"plugins": [
"intopic-toc"
],
"pluginsConfig": {
"intopic-toc": {
"label": "In this article"
}
}
}
Sample book.json
file for gitbook version 2.0.0+ and multilingual headings
{
"plugins": [
"intopic-toc"
],
"pluginsConfig": {
"intopic-toc": {
"label": {
"de": "In diesem Artikel",
"en": "In this article"
}
}
}
}
Note: Above snippets can be used as complete book.json
file, if one of these matches your requirements and your book doesn't have one yet.
Step #2 - gitbook commands
- Run
gitbook install
. It will automatically installintopic-toc
gitbook plugin for your book. This is needed only once. - Build your book (
gitbook build
) or serve (gitbook serve
) as usual.
Usage
For basic usage, the only thing you have to do is install the plugin. For advanced scenarios see following configuration sample.
{
"plugins": [
"intopic-toc"
],
"pluginsConfig": {
"intopic-toc": {
"selector": ".markdown-section h1, .markdown-section h2, .markdown-section h3, .markdown-section h4, .markdown-section h5, .markdown-section h6",
"mode": "nested",
"maxDepth": 2,
"isCollapsed": false,
"isScrollspyActive": true,
"visible": true,
"label": {
"de": "In diesem Artikel",
"en": "In this article"
},
}
}
}
Property | Description | Default value |
---|---|---|
selector | Selector used to find elements to put anchors on - only HTML headings h1 - h6 are allowed. | .markdown-section h1, .markdown-section h2, .markdown-section h3, .markdown-section h4, .markdown-section h5, .markdown-section h6 |
mode | Defines how plugin will be rendered. Possible values: 'flat' or 'nested'. | nested |
maxDepth | Defines the amount of headings which should be considered during rendering. | 6 |
isCollapsed | Defines whether the items are collapsed by default and are only expanded when activated. (Only considered when mode = 'nested') | true |
isScrollspyActive | Defines whether scrollspy effect should be applied. | true |
visible | Defines whether to show the navigation on every page | true |
label | Label which is used as heading for the navigation. Could be a single string or an object for multilingual setups | In this article |
Visibility
If visible
parameter set to true and you want to hide the TOC on a single page, add the front matter item isTocVisible: false
to the top of the Markdown file like this:
---
isTocVisible: false
---
# My awesome documentation
Lorem ipsum dolor sit amet, consetetur sadipscing elitr, ...
The specific front matter isTocVisible
overrides the visible
parameter from global configuration.
Headings
Heading are identified using selector
property of the plugin. Usually there is no need to adjust the default value. For customizations see following sections.
By default, the plugin chooses the top-level navigation items by searching for headings at the first identified heading level using selector
property value, then works its way down (<h1/>
, then <h2/>
, etc.) It will stop when it finds the first set of headings where more than one exists at that level. For example (assuming we do not have modified the selector
property):
<h1>Title</h1>
...
<h2>1 Section 1</h2>
<h3>1.1 Subsection</h3>
...
<h4>1.1.1 Subsection</h4>
...
<h3>1.2 Subsection</h3>
...
<h2>2 Section 2</h2>
<h3>2.1 Subsection</h3>
...
The plugin would see there’s only one <h1>
, then that <h2>
appears two times. Then it stops and identified level becomes the top-level navigation items in the table of contents. Following headings under those (the <h3>
s and <h4>
s in this case) would be the next levels in the navigation.
Described mechanism applies to all flat
and nested
mode. Rendering depth could be limited by specifying maxDepth
property value.
Resulting table of contents using mode = flat
and maxDepth
= 2 would look like:
1 Section 1
1.1 Subsection
1.2 Subsection
2 Section 2
2.1 Subsection
Resulting table of contents using mode = nested
and maxDepth
= 2 would look like:
1 Section 1
1.1 Subsection
1.2 Subsection
2 Section 2
2.1 Subsection
Troubleshooting
If inline TOC does not look as expected, check if your book.json
is valid according to this documentation.
Changelog
08/20/2022
- Updated development dependencies and moved to GitHub Actions
- Updated anchorjs dependency to version 4.3.1
05/03/2020
- Added support for different layout modes along with improved scrollspy experience
01/07/2019
- Used gumshoe scrollspy script for a better experience
01/05/2019
- Initial Release