Hi
if you want to make a author filter for category listing. edit the file for example : /templates/ja_teline_v/acm/news-list/tmpl/style-1.xml add this code to any where you want to show.
<field name="created_by" type="user" label="JGLOBAL_FIELD_CREATEBY_BY_LABEL"></field>
If you want to make a tags filter. edit the xml file. add this code.
<field name="tag_id" type="tag" label="JTAG" description="JTAG_DESC" mode="nested" multiple="true"></field>
edit the file :/templates/ja_teline_v/helper.content.php find for :
// Filter by language
$articles->setState('filter.language', $app->getLanguageFilter());
add this code under.
// Filter by Tag
$articles->setState('filter.tags', $params->get('tag_id', array()));
edit the file : /plugins/system/jacontenttype/models/items.php Change :
$query->where($db->quoteName('tagmap.tag_id') . ' IN (SELECT GROUP_CONCAT(tag_id SEPARATOR ",") FROM #__contentitem_tag_map WHERE content_item_id = '.$Itemid.')')
To
$query->where($db->quoteName('tagmap.tag_id') . ' IN ('.implode(',', $Itemid).')')
That it for now.