/**
* {@inheritdoc}
*/
protected function formMultipleElements(FieldItemListInterface $items, array &$form, FormStateInterface $form_state)
{
// Adjust wrapper identifiers as they are shared between parents and
// children in nested field collections.
$form['#wrapper_id'] = Html::getUniqueID($items->getName());
$elements = parent::formMultipleElements($items, $form, $form_state);
$elements['#prefix'] = '<div id="' . $form['#wrapper_id'] . '">';
$elements['#suffix'] = '</div>';
$elements['add_more']['#ajax']['wrapper'] = $form['#wrapper_id'];
return $elements;
}
/**
* {@inheritdoc}
*/
protected function formMultipleElements(FieldItemListInterface $items, array &$form, FormStateInterface $form_state)
{
// We don't want to render empty items on field collection fields
// unless a) the field collection is empty ; b) the form is rebuilding,
// which means that the user clicked on "Add another item"; or
// c) we are creating a new entity.
if (count($items) > 0 && !$form_state->isRebuilding() && !$items->getEntity()->isNew()) {
$field_name = $this->fieldDefinition->getName();
$cardinality = $this->fieldDefinition->getFieldStorageDefinition()->getCardinality();
$parents = $form['#parents'];
if ($cardinality == FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED) {
$field_state = static::getWidgetState($parents, $field_name, $form_state);
$field_state['items_count']--;
static::setWidgetState($parents, $field_name, $form_state, $field_state);
}
}
// Adjust wrapper identifiers as they are shared between parents and
// children in nested field collections.
$form['#wrapper_id'] = Html::getUniqueID($items->getName());
$elements = parent::formMultipleElements($items, $form, $form_state);
$elements['#prefix'] = '<div id="' . $form['#wrapper_id'] . '">';
$elements['#suffix'] = '</div>';
$elements['add_more']['#ajax']['wrapper'] = $form['#wrapper_id'];
return $elements;
}