I posted to the forum last month about adding autocomplete functionality that is available for adding tags to the advanced search for tags on the Public Interface. I was able to get it to work, but it only works when I’m logged into Omeka:
Just managed to add autocomplete functionality to the tags input field in Itemsbatch-edit page (admin side). To do it, I’ve changed the admin/themes/default/items/batch-edit.php as you can see following the link, basically adding