Category as Class for Custom Post Type

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I’ve only just realised that custom post types don’t appear to output the category as a class in the loop, via post_class and I wonder if anyone can suggest a work around. Is this something that should be declared when I establish my post type or is this an extension of post_class?

For example, on a post of type post the class outputs something like: class="post-50434 post type-post status-publish format-standard hentry category-my-lovely-category tag-some-ace-tag" but for my custom post type the category doesn’t appear.

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— EDIT —

Here’s a bit of my code which might help to clarify what I’m trying to do – firstly though, I’m not actually trying to get the class onto the body but onto the article in my loop: 

<?php $cat = get_the_category();
$parentCatName = get_cat_name($cat[0]->parent); ?>

<article id="post-<?php the_ID(); ?>" <?php post_class(); ?> data-category="<?php echo $parentCatName; ?>" data-title="<?php the_title(); ?>">
[...]
</article>

The trouble that I’m having is retrieving the custom post type category info in the same way as I can for the default post type.

— EDIT —

Sorry, perhaps a little background to what I’m trying to achieve will help – I’ll try to keep it brief:

  • I’m using Isotope masonry layout

  • I wish to filter results by a ‘data-category’ attribute added to each post during the loop

  • My categories for several post types (post, product, course) are grouped under common parent categories

  • In my loop I therefor want to populate that ‘data-category’ field with the parent category

My problem arises as I can only get the category, and in turn the parent category, for the default custom post type, using get_the_category.

I hope this is making sense.

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1 comment

  1. This is expected (or at least: designed) behavior.

    Here is a portion of the Codex on that:

    Of course, you can hook a custom filter function to the post_class filter.

    // EDIT
    According to your updated question, here is the updated code:

    <?php
$cat = wp_get_post_terms(get_the_ID(), 'category');
$parentCatName = get_cat_name($cat[0]->parent);
?>
<article id="post-<?php the_ID(); ?>" <?php post_class(); ?> data-category="<?php echo $parentCatName; ?>" data-title="<?php the_title(); ?>">
[...]
</article>

    If you also want to add some post classes, do it like this:

    post_class('category-'.$parentCatName);

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