Currently, applying states to change visibility of a horizontal tab, does not work.
In a custom module create something like described in the api documentation:
/**
* Implements hook_field_group_form_process_build_alter().
*/
function mymodule_field_group_form_process_build_alter(array &$element, FormStateInterface $form_state, &$complete_form) {
$element['group_my_group']['#states'] = [
'visible' => [
':input[name="field_toggle[value]"]' => ['checked' => TRUE],
],
];
}
And create a node form with at least two horizontal tabs. The second one being named "group_my_group" and the first one containing the boolean "field_toggle" checkbox.
Create a node and toggle the checkbox. The tab does not appear/dissapear but instead the fields are added below in the first tab.
Support #states similar to vertical tabs in 🐛 Applying #states to a vertical tab does not update the vertical tabs menu Needs work .
Write patch. Review. Test.
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Needs review
4.0
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patch #2 from the Comment #2 ✨ Support applying #states to a horizontal tab Needs work is not applies with field_group 8.x-3.6