If you add a bulk-action, then you have to react on this action. Simply adding a function doesn’t do anything, you have to call it: class WPSE_List_Table extends WP_List_Table { public function __construct() { parent::__construct( array( ‘singular’ => ‘singular_form’, ‘plural’ => ‘plural_form’, ‘ajax’ => false ) ); } public function prepare_items() { $columns = $this->get_columns(); … Read more
I think the latest major release warrants a new answer to this question, considering the popularity of this question. Since WordPress 4.7 (released December 2016) it is possible to add custom bulk actions without using JavaScript. The filter bulk_actions-{$screen} (e.g. bulk_actions-edit-page for the pages overview) now allows you to add custom bulk actions. Furthermore, a … Read more
When updating post taxonomies, you can call wp_defer_term_counting( true ) before you do your mass operation, and then wp_defer_term_counting( false ) to update the term counts only once per term.