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AddEventHandler("iblock", "OnBeforeIBlockPropertyAdd", Array("IblockModifer", "OnBeforeIBlockPropertyAddHandler"));
AddEventHandler("iblock", "OnBeforeIBlockPropertyUpdate", Array("IblockModifer", "OnBeforeIBlockPropertyUpdateHandler"));

class IblockModifer
{
    public function OnBeforeIBlockPropertyAddHandler(&$arFields)
    {
        if($arFields['IBLOCK_ID'] == 10 and empty($arFields["CODE"])){
            $arParams = array("replace_space"=>"_","replace_other"=>"_", 'change_case' => 'U', 'max_len' => 20);
            $tempCode = Cutil::translit($arFields['NAME'],"ru",$arParams);
            $arFields['CODE'] = $tempCode;
        }
    }

    public function OnBeforeIBlockPropertyUpdateHandler(&$arFields)
    {
            if($arFields['IBLOCK_ID'] == 10 and empty($arFields["CODE"])){
            $arParams = array("replace_space"=>"_","replace_other"=>"_", 'change_case' => 'U', 'max_len' => 20);
            $tempCode = Cutil::translit($arFields['NAME'],"ru",$arParams);
            $arFields['CODE'] = $tempCode;
        }
    }
}