Target specific product category and it's children in WooCommerce

Question

I'm trying to add custom content before shop content but only when viewing products in specific category with this category childs.

Thoes categories are: main category - 'events', child categories - 'seminarium', 'course' and 'training'.

add_action( 'woocommerce_before_shop_loop', 'eventsTerms', 18);
function eventsTerms() {

  $term = get_term_by('name', 'events', 'product_cat');
  $term_id = $term->term_id;
  $taxonomyName = 'product_cat';
  $termChildren = get_term_children( $term_id, $taxonomyName );

foreach ( $termChildren as $child ) {
  $_term = get_term_by( 'id', $child, $taxonomyName );
  $childTerms= ', "' . '' . $_term->name . '"';

  echo $childTerms; // only to see is ok

}

    if ( is_product_category( array("events", $childTerms) ) ) {
    global $product;
    wp_list_categories( 
      array(
          'show_option_all' => 'show all',
          'taxonomy' => 'product_cat',
          'style' => 'none',
          'separator' => '',
          'hide_empty' => 0,
      ));

  }

}

$childTerms returns all child categories names, so I want to use is_product_category conditional tag with array, but my code still works only on main category "events".

Where's the bug?

EDIT 1

Ok, I thought the reason why it's not working is implode can't be using in is_product_category() args. So I was trying with json_encode like that:

add_action( 'woocommerce_before_shop_loop', 'eventsTerms', 18);
function eventsTerms() {

  $term = get_term_by('name', 'events', 'product_cat');
  $term_id = $term->term_id;
  $taxonomyName = 'product_cat';
  $termChildren = get_term_children( $term_id, $taxonomyName );

foreach ( $termChildren as $child ) {
  $_term = get_term_by( 'id', $child, $taxonomyName );
  $childTerms[] = " '".$_term->name."'";
}

$x = implode(",", $childTerms);

$y = json_encode($x);

echo $y; // output as " 'seminarium', 'course', 'training'"

$y2 = preg_replace('/"([a-zA-Z]+[a-zA-Z0-9_]*)":/','$1:', $x); // removing qutes by preg_replace

echo $y2; // output as 'seminarium', 'course', 'training'

    if ( is_product_category( array('events', $y) ) ) {
    global $product;
    wp_list_categories( 
      array(
          'show_option_all' => 0,
          'taxonomy' => 'product_cat',
          'style' => 'none',
          'separator' => '',
          'hide_empty' => 0,
          'child_of' => $term_id,
      ));

  }

}

LoicTheAztec LoicTheAztec · Accepted Answer · 2019-08-10T05:23:21

The function get_term_by() doesn't work with "id", but with "term_id" instead (or "slug" or "name").
The function get_term_children() gives an array of Terms IDs.
The conditional function is_product_category() accepts an array of term names, slugs or Ids, as it's based on is_tax() function.

You are making things more complicated than they should be and you don't need a foreach loop.

To target a specific product category and its related children:

1) On Archive pages:

$term_slug = 'events';
$taxonomy  = 'product_cat';

$term_id   = get_term_by( 'slug', $term_slug, $taxonomy )->term_id; // Get the term ID
$child_ids = get_term_children( $term_id, $taxonomy ); // Get the children terms IDs
$terms_ids = array_merge( $child_ids, array($term_id) ); // an array of all term IDs (main term Id and it's children)

if ( is_product_category( $terms_ids ) ) {
    // Do something
}

So in you code:

add_action( 'woocommerce_before_shop_loop', 'eventsTerms', 18 );
function eventsTerms() {
    $term_slug = 'events';
    $taxonomy  = 'product_cat';

    $term_id   = get_term_by( 'slug', $term_slug, $taxonomy )->term_id; // Get the term ID
    $child_ids = get_term_children( $term_id, $taxonomy ); // Get the children terms IDs
    $terms_ids = array_merge( $child_ids, array($term_id) ); // an array of all term IDs (main term Id and it's children)

    if ( is_product_category( $terms_ids ) ) {
        global $product;
        
        wp_list_categories( array(
            'show_option_all' => 'show all',
            'taxonomy'        => 'product_cat',
            'style'           => 'none',
            'separator'       => '',
            'hide_empty'      => 0,
            'child_of'        => $term_id,
        ) );
    }
}

Code goes in functions.php file of your active child theme (active active theme). Tested and works.

2) On product pages, cart items or order items (instead of archive pages):

You will use conditional function has_term(), that accepts also an array of term names, slugs or Ids (The third argument (optional) is the post ID or the product ID for WooCommerce products):

$term_slug = 'events';
$taxonomy  = 'product_cat';

$term_id   = get_term_by( 'slug', $term_slug, $taxonomy )->term_id; // Get the term ID
$child_ids = get_term_children( $term_id, $taxonomy ); // Get the children terms IDs
$terms_ids = array_merge( $child_ids, [$term_id] ); // an array of all term IDs (main term Id and it's children)

if ( has_term( $terms_ids, $taxonomy, $product_id ) ) {
    // Do something
}

Target specific product category and it's children in WooCommerce

1 Answers

To target a specific product category and its related children: