Smart filter: how to set default value for input?

Question

1C-Bitrix

Bitrix:catalog.smart.filter is used .
bitrix:catalog.smart.filter processes $_REQUESTand sets the currently selected variant depending on its content. You need to set a default value for the filter input. Currently, no option is selected by default.
How to set default value for smart filter?

Answer 1

You need to customize the component.
catalog.smart.filter/component.php:416

if (empty($_CHECK)) {
  $arResult["ITEMS"][$PID]["VALUES"][array_key_first($arResult["ITEMS"][$PID]["VALUES"])]["CHECKED"] = true;
  $arResult["ITEMS"][$PID]["DISPLAY_EXPANDED"] = "Y";
}