wp_list_categories() - display first level categories and only current term's children in subcategory page

问题

I'm using WordPress.

Have multiple categories with its subcategories. In general page, I'm displaying all first level categories. Here is my code:

$args = array(
   'type' => 'product-items',
   'child_of'  => 0,
   'parent'  => '',
   'order' => 'DESC',
   'hide_empty' => 0,
   'hierarchical' => 1,
   'exclude' => '',
   'include' => '',
   'number' => '',
   'taxonomy' => 'product-category',
   'pad_counts' => false,
   'depth' => 1,
   'title_li' => '' 
);
wp_list_categories($args);

Once you click and go inside a first level category, you need to see only its subcategories there. When I'm removing 'depth' => 1, option, all children appear under their parent category but for page speed/load, in sub page I need to show all first-level categories, but only current category's children.

For example, I have below 3 categories:

Category 1
Category 2
Category 3

Imagine I click on "Category 1". Now it is like this:

Category 1
- 1st Sub Category of 1
- 2nd Sub Category of 1
- 3rd Sub Category of 1
Category 2
- 1st Sub Category of 2
  - 1st sub of 2nd category sub
  - 2nd sub of 2nd category sub
  - 3rd sub of 2nd category sub
- 2nd Sub Category of 2
- 3rd Sub Category of 2
Category 3
- 1st Sub Category of 3
- 2nd Sub Category of 3
- 3rd Sub Category of 3

But I need it to be like this in sub page:

Category 1
- 1st Sub Category of 1
- 2nd Sub Category of 1
- 3rd Sub Category of 1
Category 2
Category 3

Not sure how to achieve this with wp_list_categories() function. Any ideas please?

回答1:

It would be better if you use 2 get_terms() instead of wp_list_categories. It would be faster and customizable. One for parent categories, another one for children of current category. Here is working example:

   function display_cats($cats,$current=0,$current_children=array()){
    $ret= '<ul>';
    foreach ($cats as $cs){
      $children=($current!=$cs->term_id)?'':display_cats($current_children);
      $ret.= '<li> <a href="'.get_term_link($cs->term_id).'"> '.$cs->name.'</a> '.$children.' </li>
      ';
    }
    $ret.= '</ul>';
    return $ret;
  }


  $current_cat=9;//for example
  $parents=get_terms('product_cat',array('taxonomy'=>'product_cat','echo'=>false,'depth'=>0));
  $current_children=get_terms('product_cat',array('taxonomy'=>'product_cat','child_of'=>  $current_cat ,'echo'=>false));
  echo display_cats($parents,$current_cat,$current_children);

回答2:

I'd take the get_terms() path. Something such as

$terms = get_terms($args);

foreach($terms as $term){
   // If $term is current term use get_terms() again to fetch its children
}

https://developer.wordpress.org/reference/functions/get_terms/

回答3:

For anyone who still needs help, here's how to do it.

$category = get_queried_object();
$category_id = $category->term_id;

From this we will get the current category id and we need to pass it to the array.

'child_of'  => $category_id,

This will get you all the subcategories of the current category.

Hope this is helpful.

来源：https://stackoverflow.com/questions/47097940/wp-list-categories-display-first-level-categories-and-only-current-terms-ch

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