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Adding navigation to topics

In HTML5 output, you can set a parameter to include table-of-contents navigation in the nav element of each page. The navigation can be rendered in a sidebar or menu via CSS.

Earlier versions of DITA-OT used the TocJS transformation to render a JavaScript-based table of contents in an XHTML frameset for topic navigation. Recent toolkit versions provide a modern HTML5 navigation alternative.

As of DITA-OT 2.2, the nav-toc parameter can be used in HTML5 transformations to embed navigation directly in topics using native HTML5 elements without JavaScript or framesets.

  1. Set the nav-toc parameter to one of the following options:

    • The partial option creates a table of contents with the portion of the navigation hierarchy that contains the current topic (along with its parents, siblings and children).
    • The full option embeds the complete navigation for the entire map in each topic.
    • Add custom CSS rules to style the navigation.

    For example, the DITA-OT documentation stylesheet includes the following rules to place the table of contents on the left side of the browser viewport and highlight the current topic in bold:

    ``` / Style ToC nav as sidebar on desktop / @media screen and (min-width: 992px) { nav.toc { float: left; width: 300px; } }

    nav.toc li.active > a { font-weight: var(--font-weight-bold); } ```

Tip: For an example of HTML output generated using this method, see the HTML5 version of the DITA-OT documentation included in the installation folder under doc/index.html.