search on filter select

searx/static/plugins/js/search_on_category_select.js

             }
             return false;
         });
+        $('#time-range > option').click(function(e) {
+            if($('#q').val()) {
+                $('#search_form').submit();
+            }
+        });
     }
 });

searx/templates/oscar/time-range.html

-<select name="time_range">
+<select name="time_range" id="time-range">
     <option id="time-range-anytime" value="" {{ "selected" if time_range=="" or not time_range  else ""}}>
         {{ _('Anytime') }}
     </option>