Custom Theme Want To Remove One Category From All Displays

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I created my own custom WordPress theme for my website, everything is great. However, I have a strange need, I have one category which is kind of a ‘placeholder’ for content which is automated and used by an automated background process. Each time this process finds new content to put into that category I end up with another entry when I go to the admin screen to post or edit any of the posts which I manually enter. Since it is more than just myself, I really want a way to just completely hide that one category from being shown in the Admin ‘Edit/Post’ screen to keep it nice and lean.

I’ve poked around in some of the source code files, however, I have come to the point of frustration. Been searching around on Google and other places for any idea, yet, keep coming up empty.

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Does anyone know how to do this, or even IF it can be done?

Thanks,

Derek

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2 comments

  1. The only solution I could imagine is removing, rewriting, replacing the meta box.

    // First remove the original one
function wpse21483_remove_catbox()
{
    remove_meta_box( 'post_categories_meta_box', 'post', 'side' );
}
add_action( 'admin_menu', 'wpse21483_remove_catbox' ); // not sure about the hook

function wpse21483_new_catbox()
{
    // re-define - take a look at /wp-admin/include/metaboxes.php
}
// Hook the new one
add_action( 'add_meta_boxes', 'wpse21483_new_catbox' );

    Edit: Maybe you can use a the filter for the categories dropdown

    function wpse21483_alter_catbox( $output )
{
    global $current_screen;
    $id = $current_screen->id;
    // abort if not on post screen
    if ( $id !== 'post' )
        return;

    // search/replace the category
    return $output;
}
add_filter( 'wp_dropdown_cats', 'wpse21483_alter_catbox', 10, 1 )