How to exclude parent category but show child categories?

3 comments

1. I spent almost two months building and debugging Total Widget Control to do exactly this for all of a sites widgets. Bear with me as I strip the code out of Total Widget Control and try to make it usable for you.

       global $wp_query
       $twc_menu_item_object = $wp_query->object_id; //is the object id of the current page.
       $objects['menu-item-object'] = ''; //the object id of the tax to display under
   
       if ( taxonomy_exists($twc_menu_item_object) && isset($objects['menu-item-object']) )
       {
           foreach ($objects['menu-item-object'] as $menu_id => $menu_type)
           {
               if ( $menu_type != $twc_menu_item_object ) continue;
               if ( !cat_is_ancestor_of( $menu_id, $object_id ) ) continue;
               return true;
           }
       }
        return false;
   

   Log in to Reply

2. Comments inline:

   <?php
        global $wp_query;
       //* first let's get current post parent category ID
   
       $ID = $wp_query->posts[0]->ID; //* get current post ID
       $postcat = get_the_category($ID); //* based on post ID, get current post categories IDs -> WP function returns array of stdClass Objects, one stdClass Object for each category; if there is child - parent relationship, first it will return Objects for children categories and than for parents -> add "print_r ($postcat);" without quotation marks in next row to see content of array
       $cat = $postcat[0]->cat_ID; //* get first category ID from first Object in $postcat array (if post has children categories, it will get first child ID, else it will get first category ID)
       $thiscat = get_category ($cat); //* get array of category objects for $cat (current) category -> add "print_r ($thiscat);" without quotation marks in next row to see content of array
       $parent = $thiscat->category_parent; //* and extract parent category ID; if category has no parent category (and parent category has no parent), ID = 0
   
       //* now we have current category parent ID No, or if category has no children ID = 0
       //* let's check if we heave categroy with children categories or not
   
       if ($parent == 0) //* if parent ID = 0, it is category without parent category    
           {} //* do nothing 
   
       else { //* else, if it has children categories
   
           $subcategories = get_categories('child_of='.$parent); //* get array of children categories Objects and
   
           $items=''; //* create new ArrayObject and
   
               foreach($subcategories as $subcat) { //* foreach child category in array
                   if($thiscat->term_id == $subcat->term_id) //* check if current category ID is same as child category ID
                   $current = ' current-cat'; //* if true, add current-cat to li class
                   else $current = ''; //* if not, add nothing
   
                   $items .= '
                   <li class="cat-item cat-item-'.$subcat->term_id.$current.'"> <!-- if is child current, add here .current-cat //-->
                       <a href="'.get_category_link( $subcat->term_id ).'" title="'.$subcat->description.'">'.$subcat->name.' ('.$subcat->count.' posts)</a> <!-- link to -> category link, title -> category description, show -> category name and No of posts //-->
                   </li>';
               }
   
           echo "<ul>$items</ul>";
       }
   ?>
   

   Log in to Reply

3. $categories = get_categories('child_of='.INSERT_YOUR_CATEGORY_PARENT_HERE.''); 
   foreach ($categories as $category) {
       echo $category->name;
   }
   

   Editors note: INSERT_YOUR_CATEGORY_PARENT_HERE has to be replaced, else it would be seen as undefined constant and throws an Error.

   Log in to Reply