Matthew Petroff

<p>This plugin adds a widget to display archive links using purely CSS-based collapsing; no JavaScript is used.</p>
<h4>Options</h4>
<ul>
<li>Post counts can optionally be displayed next to the archive links</li>
<li>Choice of either +/- or arrows to indicate expansion</li>
<li>Option to never automatically expand list for current post / year</li>
<li>Choice between displaying archive links in reverse chronological order or chronological order</li>
<li>Decades can be collapsed</li>
</ul>
<h4>1.6 (2021-04-03)</h4>
<ul>
<li>Added support for collapsing decades (thanks to @PHil-PlainTech)</li>
</ul>
<h4>1.5 (2019-05-05)</h4>
<ul>
<li>Fix for warning message in logs</li>
</ul>
<h4>1.4 (2019-04-12)</h4>
<ul>
<li>Fixed bug for sites without posts</li>
</ul>
<h4>1.3 (2019-01-16)</h4>
<ul>
<li>Fixed deprecation warning in PHP 7.2</li>
</ul>
<h4>1.2 (2018-07-09)</h4>
<ul>
<li>Added option for never automatically expanding list for current post / year</li>
<li>Fixed issue with wrong year being expanded</li>
</ul>
<h4>1.1 (2015-02-09)</h4>
<ul>
<li>Improved theme support</li>
</ul>
<h4>1.0 (2014-12-30)</h4>
<ul>
<li>Initial release</li>
</ul>
<p><a href="https://github.com/mpetroff/collapsed-archives-wp" rel="nofollow ugc">Plugin website</a></p>


Collapsed Archives

Adds a widget to display archive links using purely CSS-based collapsing.

migrad

<h4>Frontend</h4>
<p>This plugin allows you to display and collapse the tree of subcategories of categories that have at least one subcategory.</p>
<p>Features:</p>
<ul>
<li>Collaps and expand subcategories.</li>
<li>Remove links of all or some categories.</li>
<li>Hide one or several categories.</li>
<li>Change the images with plus and minus symbols for other images that represent collapsed or expanded categories, or css icons.</li>
<li>Order categories list by name and slug.</li>
<li>Hide icons for expand/collapse if you don’t want it.</li>
<li>Collapse all categories when show a post page or maintain expand the category related with the post.</li>
<li>Maintain expand all or some categories.</li>
</ul>
<h4>If your WordPress theme don’t use the widget categories list of WordPress, this plugin maybe don’t work.</h4>
<h4>Backend</h4>
<p>This plugin allows you can to limit the number of categories and subcategories selectables in the categories list block in edit post page.</p>
<p>Features:</p>
<ul>
<li>Limit the number of categories or subcategories selectables in the categories list block in edit post page.</li>
<li>Admin page for custom this limit for category level.</li>
</ul>


Collapsing Categories List

This plugin modifies the categories block to add new features such as collapse and expand categories and subcategories, order, etc.

Collapsed Archives vs Collapsing Categories List