Select::renderControl

static function renderControl(FieldType $fieldType, array $field, $value, $allowSelection, $renderMode)
{
	$selectorValue = null;
	$typeValue = [];
	if (!is_array($value))
	{
		$value = (array)$value;
	}

	if (CBPHelper::isAssociativeArray($value))
	{
		$value = array_keys($value);
	}

	foreach ($value as $v)
	{
		if ($allowSelection && CBPActivity::isExpression($v))
		{
			$selectorValue = $v;
		}
		else
		{
			$typeValue[] = (string)$v;
		}
	}

	// need to show at least one control
	if (empty($typeValue))
	{
		$typeValue[] = null;
	}

	$className = static::generateControlClassName($fieldType, $field);
	$selectorAttributes = '';

	$isPublicControl = $renderMode & FieldType::RENDER_MODE_PUBLIC;

	if ($allowSelection && $isPublicControl)
	{
		$selectorAttributes = sprintf(
			'data-role="inline-selector-target" data-property="%s" ',
			htmlspecialcharsbx(MainWebJson::encode($fieldType->getProperty()))
		);
	}

	if ($fieldType->isMultiple())
	{
		$selectorAttributes .= 'size="5" multiple ';
	}

	$renderResult = sprintf(
		'',
		htmlspecialcharsbx(static::generateControlId($field)),
		($isPublicControl ? htmlspecialcharsbx($className) : ''),
		htmlspecialcharsbx(static::generateControlName($field)),
		$fieldType->isMultiple() ? '[]' : '',
		$selectorAttributes
	);

	$settings = static::getFieldSettings($fieldType);

	$showEmptyValue = isset($settings['ShowEmptyValue']) ? CBPHelper::getBool($settings['ShowEmptyValue']) : null;
	if (($showEmptyValue === null && !$fieldType->isMultiple()) || $showEmptyValue === true)
	{
		$renderResult .= '['.Loc::getMessage('BPDT_SELECT_NOT_SET').']';
	}

	$groups = $settings['Groups'] ?? null;

	if(is_array($groups) && !empty($groups))
	{
		foreach($groups as $group)
		{
			if(!is_array($group))
			{
				continue;
			}

			$name = isset($group['name']) ? $group['name'] : '';

			if($name !== '')
			{
				$renderResult .= '';
			}

			$options = isset($group['items']) && is_array($group['items']) ? $group['items'] : array();
			foreach($options as $k => $v)
			{
				$renderResult .= ' $v)
		{
			$renderResult .= ''.htmlspecialcharsbx(htmlspecialcharsback($v)).'';
		}
	}

	if ($allowSelection && $selectorValue && $isPublicControl)
	{
		$renderResult .= sprintf(
			'%s',
			htmlspecialcharsbx($selectorValue),
			htmlspecialcharsbx($selectorValue)
		);
	}

	$renderResult .= '';

	if ($allowSelection && !$isPublicControl)
	{
		$renderResult .= static::renderControlSelector($field, $selectorValue, true, '', $fieldType);
	}

	return $renderResult;
}