A Jekyll plugin for Just the Docs sites that shows in-page hover previews for internal documentation links.

Inspired by the hover window behavior in 5etools.

• Hover over an internal link to see a reference preview
• Persist windows by holding the SHIFT key
• Close all windows by holding CTRL while closing one
• Minimize windows by double clicking the title bar
• Navigate to an entry later by clicking the link in the title bar
• Eight point window resize
• Exposes window.JekyllHoverPopup for other plugins

Add to your site Gemfile:

group :jekyll_plugins do
  gem "jekyll-hover-popup", path: "/path/to/hover-popup"
end

Then in _config.yml:

plugins:
  - jekyll-hover-popup

Optional _config.yml settings:

hover_popup:
  enabled: true
  assets_path: /assets/jekyll-hover-popup
  hover_delay_ms: 0
  nav_hover_preview: true

Add a hover_delay_ms to delay the preview window creation

Set nav_hover_preview: false to disable hover previews for links inside navigation elements (.site-nav, nav, [role="navigation"], etc.).

When loaded, the plugin exposes:

window.JekyllHoverPopup.openLink({
  href: "#section-id",
  title: "Section title",
  clientX: 120,
  clientY: 240,
  isPermanent: true,
});

window.JekyllHoverPopup.openContent({
  title: "Custom preview",
  pageUrl: "/docs/page/",
  content: document.createElement("div"),
  clientX: 120,
  clientY: 240,
  isPermanent: true,
  maxWidth: "min(96vw, 1200px)",
});

MIT