I'm trying to add a CSS class to every image in a custom post type.
I've found this answer, to add a class to every image in general:
function add_image_class($class){ $class .= ' additional-class'; return $class; } add_filter('get_image_tag_class','add_image_class'); How would I build on this, so that it only applies to a custom post type?
Combining the answer here by @cjcj with the code in this answer, the code that works for me outside the loop, in functions.php is:
// Add ability to check for custom post type outside the loop. function is_post_type($type){ global $wp_query; if($type == get_post_type($wp_query->post->ID)) return true; return false; } // Add class to every image in 'wpse' custom post type. function add_image_class($class){ if ('wpse' == is_post_type()){ $class .= ' additional-class'; } return $class; } add_filter('get_image_tag_class','add_image_class'); The function get_post_type returns the type of the current post, so supposing you want to add this class only to a post type called 'wpse' you should include a conditional like this:
function wpse237573_add_image_class($class){ if ('wpse' == get_post_type()) $class .= ' additional-class'; return $class; } add_filter('get_image_tag_class','wpse237573_add_image_class'); 