function load_adthrive_terms(taxonomy) { return function(query, callback) { jQuery.ajax({ url: ajaxurl, type: 'GET', data: { action: 'adthrive_terms', taxonomy: taxonomy, query: query }, error: function() { callback(); }, success: callback, }); } } jQuery(document).ready(function($) { $('#disabled_tags').selectize({ preload: true, load: load_adthrive_terms('post_tag') }); $('#disabled_categories').selectize({ preload: true, load: load_adthrive_terms('category') }); });