View difference between Paste ID: duwpmKGb and a5Rw6L8Z

 $(function() {
     $('.productTag').click(function() {
         var $tag = $(this);
         $('.productTag').each(function() {
             $(this).removeClass('active');
         });
 
         $.ajax({
             url: 'assortiment/filter?title=' + $(this).text()
         }).done(function(data) {
-	    $(this).addClass('active');
+
 	    $tag.addClass('active');
         }).fail(function(jqXHR, textStatus) {
             alert( "Request failed: " + textStatus );
         });
     });
 });