Custom controller implementation

Standard iblock REST controller \Bitrix\Iblock\Controller\DefaultElement includes the following methods:

Method	Descripton
getElementEntityAllowedList	Permitted iblock fields `\Bitrix\Iblock\ElementTable::getMap`. They are selected by default, if the query didn't indicate `select`.
getAllowedList	List of permitted fields for retrieval. Iblock fields from method `getElementEntityAllowedList` and all iblock properties are permitted by default. If you want to use other fields and especially relations, you need to list all IDs in this parameter.
getAction	Gets a single element by ID.
listAction	Gets several elements.

Allows to create a full controller, as well as inherit from standard controller with redefining necessary methods.

After describing your own controller class, register it in the Service locator Service locator is a design template for convenient use of app services.

Learn more here: Bitrix Framework. with identifier iblock.element.{IBLOCK_API_CODE}.rest.controller, where {IBLOCK_API_CODE} - API symbolic code value (API_CODE) of your iblock. For example: iblock.element.OfficialNews.rest.controller.

By default, controller operate only within REST context. Starting from version 20.100.200, you can access public unlimited access to iblock data via AJAX-controller mechanism. To do it, you need to clear all pre-filters:

class MyElement extends \Bitrix\Iblock\Controller\DefaultElement
{
    protected function getDefaultPreFilters()
    {
        return [];
    }
}