Query Filter: Add Parent, Child of options for Taxonomy - Terms filter

Erehr · January 21, 2026, 2:56pm

Now that’s interesting. With ‘populated_options’ I got this so far:

gist.github.com

https://gist.github.com/Erehr/2f153a6739d91adddfc33321cc7e5707

Bricks filter - parent, child_of, accordion, partial accordion

<?php
if ( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly

/**
 * Add custom filter controls for taxonomy filtering
 */
add_filter( 'bricks/filter_element/controls', function( $controls, $element ) {
    $new_controls = [
        'hierarchicalParent' => [
            'type'        => 'checkbox',

This file has been truncated. show original

Child of current term toggle - basically {term_id} in child_of field.

But I found that I can also modify the filter depending on what is actually filtered:

Child of currently filtered term
Hierarchical accordion
Hierarchical partial accordion (shows all children of topmost parent)

And everything working with element ajax reload. Somehow

filter-ajax-accordion

.

Still need some work but posting it if anyone want to test it.