table-of-contents-plus
A powerful yet user friendly WordPress plugin that automatically creates a context specific index or table of contents (TOC) for long pages (and custom post types). More than just a table of contents plugin, this plugin can also output a sitemap listing pages and/or categories across your entire site.
Built from the ground up and with Wikipedia in mind, the table of contents by default appears before the first heading on a page. This allows the author to insert lead-in content that may summarise or introduce the rest of the page. It also uses a unique numbering scheme that doesn't get lost through CSS differences across themes.
This plugin is a great companion for content rich sites such as content management system oriented configurations. That said, bloggers also have the same benefits when writing long structured articles. Discover how Google uses this index to provide 'Jump To' links to your content.
Includes an administration options panel where you can customise settings like display position, define the minimum number of headings before an index is displayed, other appearance, and more. For power users, expand the advanced options to further tweak its behaviour - eg: exclude undesired heading levels like h5 and h6 from being included; disable the output of the included CSS file; adjust the top offset and more. Using shortcodes, you can override default behaviour such as special exclusions on a specific page or even to hide the table of contents altogether.
Prefer to include the index in the sidebar? Go to Appearance > Widgets and drag the TOC+ to your desired sidebar and position.
Custom post types are supported, however, auto insertion works only when the_content() has been used by the custom post type. Each post type will appear in the options panel, so enable the ones you want.
Collaborate, participate, fork this plugin on Github.