Filter to derive a Table Of Contents from a HTML body.

This filter extracts a nested table of contents from the h2..h6 elements in a HTML text.

The headers may not have any attributes (ie. only <h2>).

All sections are wrapped in <div> elements, this to make it possible to make the headers sticky without having them overlap.

Example usage:

{% with id.body|toc as toc, body %}
    {% include "page-parts/_toc.tpl" toc=toc %}
    {{ body|show_media }}
{% endwith %}

The returned ToC tree is a nested tree of 3-tuples:

[ {<<"toc1">>, <<"Text of header">>, [ ... ]}, ... ]

The third element is a list of sub-headers.

To generate a nested table of contents from the above structure:

{% include "page-parts/_toc.tpl" toc=toc %}

And then the page-parts/_toc.tpl as:

{% with level|default:1 as level %}
{% if toc %}
    <ol class="toc-level-{{ level }}">
    {% for p, text, sub in toc %}
            <a href="#{{ p }}">{{ text }}</a>
            {% include "page-parts/_toc.tpl" toc=sub level=level+1 %}
    {% endfor %}
{% endif %}
{% endwith %}

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format_duration Strings normalize_email

Referred by


Filters transform template variables before they are rendered.