Taxonomy container select list

The module provides a select list with optgroups for taxonomy terms selection.

The way how the module implements optgroups depends on Drupal version.

Drupal 8
Provides an entity reference selection plugin «Taxonomy term selection (with groups)».
Drupal 7
Provides a field widget called «Select list (with groups)» to term reference fields.
Drupal 6
Alters taxonomy form and converts to optgroups all top-level options in the select list.

Note:
Chosen module can help you to make select boxes much more user-friendly.

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