Widget
Widget settings

Form Element States module provides a field widget for all core field types to add state properties into it. Common use cases is some fields need to be visible/hide/required depends on other field value.

* For a full description of the module visit
https://www.drupal.org/project/form_element_states

* To submit bug reports and feature suggestions, or to track changes visit
http://drupalsharing.com/project/form-element-states-drupal8

For more help how states are in drupal Form element

https://api.drupal.org/api/drupal/core!includes!common.inc/function/drup...

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