When you want to automatically show dropdown menu by specified category, its subcategories and articles, you might want to use Auto Category Dropdown Menu module.
- Automatic menu generation (this menu does not exist in Joomla "Menu" backend section).
- Showing categories with link to index article.
- Searching categories' index articles by customizable regular expression.
- Categories and articles ordering control.
- Full CSS control of displaying menu: a LOT of various classes assigned to menu items.
- Customizable filtering features:
- Filtering by atricles/categories published/unpublished status
- Root node visibility customizing
- Category query depth option
- Ablility to union top levels of menu
- Ability to hide some menu levels parent of child to selected
- Hiding by CSS of removing hidden menu items
- Hiding items in not selected branches
- Controlling behavior of hiding nodes if no one selected.
- Menu will be automatically shown as vertical or horizontal dropdown with using customizable via backend Superfish script.
- Twitter Bootstrap horizontal menu is supported.