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How to add hierarchical select form fields in drupal 8

Hierarchical select fields are form fields with a list of values dependent on the selection of another field.

Requirements

  • Both fields must use the widget “Select list” or “Checkboxes/radio buttons”;
  • The child field type must be “Entity reference”
  • A view with the display mode “Entity Reference” must exist and is configured to receive as the first argument the value of the parent field.
  • Business Rules Module
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