Custom Taxonomy tree view not showing correctly in backend

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I’m using a Custom Post Type product with the Custom Taxonomy product_category. When editing a product in WordPress, there is a problem with displaying the product categories tree view right.

When an item is checked, it will move to the top of the list. When this item is a top level category, the child categories stay in the same spot in the list and therefore aren’t shown correctly.

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When an subcategory is selected, it will also move to the top of the list. It isn’t shown in the tree view anymore.

An example: 

Before selecting:
O - A
O   - A.1
O   - A.2
O   - A.3
O - B
O   - B.1
O   - B.2
O   - B.3

After selecting:
X - A.2
X - B
O - A
O   - A.1
O   - A.3
O - B.1
O - B.2
O - B.3

O = unchecked
X = checked

I thinks it’s a WordPress bug but I can’t find the problem in the WordPress core files. Does anyone know a solution?

Post Views: 3

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1 comment

  1. Found a solution. It is a WordPress builtin functionality, not a bug. Could be prevented with the ‘wp_terms_checklist_args’ filter.

    Below an example for use with Custom Post Type ‘product’ and Custom Taxonomy ‘product_category’:

    add_filter( 'wp_terms_checklist_args', 'checked_not_ontop', 1, 2 );

function checked_not_ontop( $args, $post_id ) {
    if ( 'product' == get_post_type( $post_id ) && $args['taxonomy'] == 'product_category' )
        $args['checked_ontop'] = false;

    return $args;
}

    http://core.trac.wordpress.org/ticket/10982
    http://core.trac.wordpress.org/ticket/20054