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I am using an OOP approach to doing all the work in creating the CPT and its meta boxes. For admin styling purposes, I want to do some heavier styling for a specific custom post type. My object method creates the following HTML results:

<div id="client_info" class="postbox ">
    <button type="button" class="handlediv" aria-expanded="true"><span class="screen-reader-text">Toggle panel: Client Info</span><span class="toggle-indicator" aria-hidden="true"></span></button>
    <h2 class='hndle'><span>Client Info</span></h2>
    <div class="inside">
        <label for="client_info_client_first_name">Client First Name</label>
        <input type="text" name="custom_meta[client_info_client_first_name]" id="client_info_client_first_name" value="" />
        <label for="client_info_client_last_name">Client Last Name</label>
        <input type="text" name="custom_meta[client_info_client_last_name]" id="client_info_client_last_name" value="" />
        <label for="client_info_client_age">Client Age</label>
        <input type="number" name="custom_meta[client_info_client_age]" id="client_info_client_age" value="" />
    </div>
</div>

What I want to do is add a custom class to the <div> element for each box that is the same so that the class attribute would be like: class="postbox my-class"

I have tried using add_filter() in order to do this but the problem is the only hook I can find relevent is the postbox_classes_{$page}_{$id} which I cannot figure out how to make dynamic as I want my object's method to handle registering the filter. I have tried using concatenation with . and HereDoc style:

function meta_box_add_class( $classes ) {
    array_push( $classes, 'jldc-fitcase-meta' );
    return $classes;
}
add_filter( 'postbox_classes_custom-post-type_' . $box_id, 'meta_box_add_class' );
add_filter( 'postbox_classes_custom-post-type_{$box_id}', 'meta_box_add_class' );

Is there a way to add this hook dynamically as each metabox is created?

  • 1
    fyi, the body tag has classes that let you target specific post type admin screens. – Milo Dec 18 '17 at 3:13
  • Thanks. I didn't even think to look at that. But I am still curious if it is possible to use hooks like I was originally attempting. – Cedon Dec 18 '17 at 10:30
  • I actually solved it. I cannot do it directly with the add_action() or add_filter() statement, but rather I can create a variable and and then do it. Your solution worked by the problem is the CSS would effect every meta box, including the default ones. – Cedon Dec 19 '17 at 1:23
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After doing some playing around, I discovered this can actually be accomplished by defining the name of the hook I want to add the filter to via a variable.

So if my $post_type_name is portfolio and my $box_id is piece_info, I can make a filter as follows:

function add_meta_box_class( $classes ) {
   array_push( $classes, 'custom-class');
   return $classes;
}
$filter_name = 'postbox_classes_' . $post_type_name . '_' . $box_id;
add_filter( $filter_name , 'add_meta_box_class' );

This will result in a filter being created using the postbox_classes_{$page}_{$id} hook as postbox_classes_portfolio_piece_info.

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