How to automatically select the taxonomy parent term if child term is selected in Drupal 7?

Question

I have a vocabulary displayed as checklist that has both parent and child terms like:

• Parent 1
  • Child1.1
  • Child1.2
• Parent 2
  • Child2.1
  • Child2.2
  • Child2.3

My requirement is to have the parent term disabled by default. In case user selects any of the child term, the parent gets automatically selected.

Suggestions?

Answer 1

You can modify the value of the reference field on save. If node entity use hook_node_presave(). First get the original tid & load it using taxonomy_term_load() to get term object, get parent id from that and replace it in the reference field.

Answer 2

The Term Reference Tree Widget Module provides a nice interface for selecting terms and gives an options to select the parent term when selecting the child.