Additional hidden fields

Allows adding custom hidden fields to the form block. These fields will not be visible in the Block Editor. Useful if external data needs to be passed through the form.

\add_filter('es_forms_block_form_additional_hidden_fields', [$this, 'getBlockFormAdditionalHiddenFields'], 10, 2);

/**
 * Set additional hidden fields to form block.
 *
 * @param array<mixed> $output Output data.
 * @param string $formId FormId value.
 *
 * @return array<mixed>
 */
public function getBlockFormAdditionalHiddenFields(array $output, string $formId): array
{
	$output['additionalHiddenFields'] = [
		[
			'name' => 'additional-hidden-field',
			'value' => 'additional-hidden-field-value',
		],
	];

	return $output;
}