I spent a good amount of time at Monday's evening to actually figure this out. In today's Drupal Tutorial - How to List Drupal Child Terms on Taxonomy Pages with Views.
This issue has been on my table for about two years.
For the ease of this tutorial - here is basic setup. For a content type blog I have created pre-defined vocabulary - Category. Most of the category items are not related and are in linear format. But few of them are related and I have listed them as child terms.
Pre-defined category in Drupal
The tricky part is how to display child terms under parent taxonomy page - let's say a visitor is visiting parent category page - Tourism Objects and we would like to feature a little sub-menu with child terms, like airports, shopping venues e.t.c.
I tried many modules and solutions, but decided to stick with a simple views configuration using attachment feature.
Drupal taxonomy page views to list child terms
In following example I have actually extended a little bit usability by displaying count for each child term using aggregation.
Open your taxonomy/term/% view and add a new attachment.
Give it a nice name, Child terms, for example.
Start by adding a contextual filter:
- Taxonomy Term:Parent term
- Provide default value: Taxonomy Term ID from URL
- Load default filter from term page
- Content: Taxonomy terms on node
- Require this relationship
- Use aggregation: Yes
- Format: Unformatted
- Show: Fields
- Taxonomy term (name)
- Taxonomy term (tid)
- Global: Custom
Paste following in Custom field:
<div class="tax-menu">[name] <span class="small"> ([tid])</span></div>
were tax-menu and small are a div classes you can latter use for styling your sub-menu
Make sure you remove date, cause it will break things if you have enabled aggregation
- Taxonomy Term ID, use aggregation Count
- Attach to: Page
- Attachment position: before
Save your view, and you should be done with technical stuff. Now it is time to apply some CSS. Here is what I got at the result:
Listing child terms on Drupal taxonomy page
Using similar approach (attachment) I have attached taxonomy term description and even Google Maps to my category pages.