Show all category children

Hi, I have the same problem.
using widget logic with woocommerce, I manage to display a Vsubmenu on the corresponding category page, but not on the subcategories and product pages pertaining to this category.

Thanks for any help.
Cheers
Tina

Okay, these requests are a little older, but in case somebody comes looking for just this: I got equally frustrated today because WP doesn’t seem to have a condition for that, so I wrote one.

This is custom-made for my site, so no guarantees. Also, because I only needed it in that context, the function expects $catarray to be an array. If you’re only looking for one category, either enter it as an array of one or add an extra condition (if (!is_array) or something) to the function. It’s all pretty bare-bones, too, no checking if the post actually has a chapter and if a function by that name already exists and all that. Feel free to use it as a starting point. Other than that, you should be able to just copy this to your function.php, then use “in_subcategory()” in Widget Logic:

function in_subcategory ($catarray) {
	$currentcatz = get_the_category( $post->ID ); 
	foreach ($catarray as $catid) { 
		foreach ($currentcatz as $currentcat) { 
			if ( cat_is_ancestor_of( $catid, $currentcat->cat_ID ) )
				{ return true; }
			else 
				{ return false; }
			}
		}
	}

… No wait, that was too simple.
This should work, though:

function in_subcategory ($catorcats) {
	$truepositive = 0;
	$currentcatz = get_the_category( $post->ID ); 
	foreach ($currentcatz as $currentcat) {
		if (is_array($catorcats)) { 
			foreach ($catorcats as $arraycat) { 
				if ( cat_is_ancestor_of( $arraycat, $currentcat->cat_ID ) )
					{ $truepositive = 1; } 
			}
		} else { 
			if ( cat_is_ancestor_of( $catorcats, $currentcat->cat_ID ) )
				{ $truepositive = 1; } 
		}
	}
	if ($truepositive == 1 ) 
		{ return true; }
	else 
		{ return false; }
}

And now it also checks for arrays because once I had it, I started using it more and got fed up with using fake arrays.