CiviCRM Community Forums (archive)

I want to modify the frontend Event Listing pages to add a filter by Event Type (labeled as Category on the events listing page). Preferably I'd pass in an Event Type ID, via URL on the link to the listing.  I'm having trouble finding the component Joomla is using. Can you tell me where to look to find this code? I'm running: Joomla 3.4.3, CiviCRM 4.6.5 (upgrading soon)

I found this two components, but they are both pretty much empty:

• /administrator/components/com_civicrm/civicrm/joomla/site/views/Events/tmpl/eventlisting.php
• /components/com_civicrm/views/Events/tmpl/eventlisting.php

Once I find the component, will the SQL statement be in there? Or might there be a hook to add a filter, or append to the WHERE clause?

Also can you point me to instructions for overriding a Civicrm/Joomla component like this? Google wasn't any help. 

Thanks for any help. I'm new to CiviCRM, but not PHP, SQL, or Joomla.
- Kimball