I recently had to extend the search to include custom fields in WordPress admin. I created a custom post type called “document” and a few custom fields such as “_file_name” and “_url”. Unfortunately, it’s not possible to search by custom field value in WordPress admin, so I had to hook into the native WordPress search and tweak it.
The autocompletion allows users to select from a pre-populated list of suggestions as they type. There are a number of jQuery autocomplete plugins. I’ll create an autocomplete from the post titles and redirect to a blog post based on selected option value.
By default, WooCommerce comes with 6 sorting options. In this example, I’ll add an extra option to sort by sale status. However, if your sorting needs are more advanced, then you can hook into pre_get_posts instead of woocommerce_get_catalog_ordering_args.