Config::appendField

public function appendField(array $options)
{
	if (!empty($options['type']))
	{
		$isSupportedType = in_array(
			$options['type'],
			array_merge(
				array_keys(WebForm\Helper::getFieldNonValueTypes()),
				['product']
			)
		);
		if (!$isSupportedType)
		{
			return; //todo: need ErrorCollection
		}

		$options += [
			'name' => $options['type'] . '_' . mt_rand(1000000, 9999999),
			'label' => WebForm\Internals\FieldTable::getTypeList()[$options['type']]
		];
		switch ($options['type'])
		{
			case 'product':
				/**
				 * @var \CIBlockResult $iblockItems
				 */
				$iblockItems = \CIBlockElement::GetList(
					["SORT"=>"DESC"],
					[
						'=IBLOCK_ID' => \CCrmCatalog::EnsureDefaultExists(),
						'!==PREVIEW_PICTURE' => null,
						'!==DETAIL_PICTURE' => null,
					],
					false,
					[
						'nTopCount' => 3
					],
				);
				$items = [];

				while ($item = $iblockItems->Fetch())
				{
					$items[] = [
						'value' => $item['ID'],
						'label' => $item['NAME'],
						'price' => \CCrmProduct::getPrice($item['ID'])['PRICE'],
					];
				}
				$options += [
					'bigPic' => true,
					'multiple' => true,
					'items' => $items,
				];
				break;
			default:
				$options += [
					'type' => 'layout',
					'content' => ['type' => $options['type']],
				] + $options;
		}
	}

	$this->fieldsConfig->append($options);
}