This plugin makes it possible to automatically add linkable anchors to HTML headings in Craft.

The anchors are named based on the heading text. The algorithm Anchors uses to convert the heading text to IDs is similar to Craft’s algorithm for automatically generating entry slugs.

This plugin requires Craft CMS 3.0.0-beta.27 or later.

You can install this plugin from the Plugin Store or with Composer.

Go to the Plugin Store in your project’s Control Panel and search for “Anchors”. Then click on the “Install” button in its modal window.

Open your terminal and run the following commands:

# go to the project directory
cd /path/to/my-project.test

# tell Composer to load the plugin
composer require craftcms/anchors

# tell Craft to install the plugin
./craft install/plugin anchors

To use Anchors in your templates, just pass some HTML into the |anchors filter.

{{ entry.body|anchors }}

By default, the anchors filter will only search for <h1>, <h2>, and <h3> tags. You can customize which tags it searches for by passing in a comma-separated list of tag names.

{{ entry.body|anchors('h2,h3') }}

The anchors filter will convert any non-ASCII characters to ASCII, using the current site’s language’s ASCII character mappings by default.

If you are displaying content in a different language than the current site, use the language argument to override which ASCII character mappings should be used:

{{ entry.body|anchors(language=entry.site.language) }}

To configure Anchors, create a new anchors.php file within the config/ folder, which returns an array.

The following config settings are supported:

• anchorClass – The class name that should be given to named anchors. (Default is null, meaning no class will be given.)
• anchorLinkClass – The class name that should be given to anchor links. (Default is 'anchor'.)
• anchorLinkText – The visible text that anchor links should have. (Default is '#''. If {heading} is included, it will be replaced with the heading text the link is associated with.)
• anchorLinkTitleText – The title/alt text that anchor links should have. If {heading} is included, it will be replaced with the heading text the link is associated with. (Default is 'Direct link to {heading}'.)

Other plugins can take advantage of Anchors using the provided API.

$parsedHtml = \craft\anchors\Plugin::getInstance()->parser->parseHtml($html);

Like the |anchors templating filter, parseHtml() also allows you to specify which HTML tags should get anchors.

$parsedHtml = \craft\anchors\Plugin::getInstance()->parser->parseHtml($html, 'h2,h3');

You can also pass some heading text directly into Anchors to get its generated anchor name:

$anchorName = \craft\anchors\Plugin::getInstance()->parser->generateAnchorName($headingText);