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1. signalnorth
   Member
   Posted 2 years ago #

   I need a code to get the sub-categories including while I'm on that category and a post within the category. However, I only want to get the subcategory links - not the parent category.

   Anybody have it?

2. signalnorth
   Member
   Posted 2 years ago #

   I have this part of the way figured out... this displays the sub-category, but it also displays the parent category, so that's a problem.

   <?php
     if($post->post_parent)
     $children = wp_list_categories("title_li=&child_of=".$page->page_parent."&echo=0");
     else
     $children = wp_list_categories("title_li=&child_of=".$page->ID."&echo=1");
     if ($children) { ?>
     <ul>
     <?php echo $children; ?>
     </ul>
     <?php } ?></ul>

   And this displays perfectly, but on the category/archives page the sub-category doesn't show.

   <?php
     if($post->post_parent)
     $children = wp_list_categories("title_li=&child_of=".$page->page_parent."&echo=0");
     else
     $children = wp_list_categories("title_li=&child_of=".$post->ID."&echo=1");
     if ($children) { ?>
     <ul>
     <?php echo $children; ?>
     </ul>
     <?php } ?></ul>

3. Dumai
   Member
   Posted 1 year ago #

   <?php
   if(is_category()) {
   
   	$breakpoint = 0;
   	$thiscat = get_term( get_query_var('cat') , 'category' );
   	$subcategories = get_terms( 'category' , 'parent='.get_query_var('cat') );
   
   	if(empty($subcategories) && $thiscat->parent != 0) {
   		$subcategories = get_terms( 'category' , 'parent='.$thiscat->parent.'' );
   	}
   
   	$items='';
   	if(!empty($subcategories)) {
   		foreach($subcategories as $subcat) {
   			if($thiscat->term_id == $subcat->term_id) $current = ' current-cat'; else $current = '';
   			$items .= '
   			<li class="cat-item cat-item-'.$subcat->term_id.$current.'">
   				<a href="'.get_category_link( $subcat->term_id ).'" title="'.$subcat->description.'">'.$subcat->name.'</a>
   			</li>';
   		}
   		echo "<ul class='links'>$items</ul>";
   	}
   	unset($subcategories,$subcat,$thiscat,$items);
   }
   ?>

   The code above pulls the Child Category links of the Parent category, but it only works on archive pages (Parent/Child Category). Can someone please help to also make it work when you go into a post (single.php).

4. max@op
   Member
   Posted 1 year ago #

   Hi,
   I use this code for single page with. Explanation is maybe a little big long, but it may help.

   TERMS USED
   category = any category
   parent category = category with subcategories
   child category = child (subcategory) of parent category

   REMARKS
   every category has parent category ID -> if category has no parent, parent ID = 0

   PROCEDURE
   1. get current post parent category ID
   2. check parent category ID -> if is 0, it is category without children
   3. get subcategories
   4. check which of subcategories is current and add current-cat div to it
   5. format data for output
   6. echo subcategory list

   FUNCTIONS
   get_the_category () and get_category () returns stdClass Object for one, or array of stdClass Objects for many post categories and subcategories, depedens on ($args)

   category stdClass Object contains next category objects
   [term_id] => category ID
   [name] => category name
   [slug] => category slug
   ...
   [description] => category description
   ...
   [count] => No of posts in category
   ...
   [category_parent] => parent category ID; if category is parent, ID = 0

   VARIABLES
   $postcat -> current post categories IDs
   $cat -> post first category ID
   $thiscat -> post first category objects
   $parent -> post first category parent ID

   <?php
   
   	//* 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 chlidren
   
   		{} //* do nothing 
   
   	else { //* else, if it has children categories
   
   		$subcategories = get_categories('child_of='.$parent); //* get array of children categories Objects and
   
   		//* this next part is Marks (t31os) code from WP forum topic 'Showing subcategories of a parent page under subcategory'
   
   		$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>";
   	}
   ?>

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