src/Filter/Setting/SimpleLookup.php
protected function getParamName()
    {
        if ($this->get('urlparam')) {
            return $this->get('urlparam');
        }

        $objAttribute = $this->getFilteredAttribute();
        if ($objAttribute) {
            return $objAttribute->getColName();
        }

        return null;
    }
protected function getParamName()
    {
        if ($this->get('urlparam')) {
            return $this->get('urlparam');
        }

        $objAttribute = $this->getFilteredAttribute();
        if ($objAttribute) {
            return $objAttribute->getColName();
        }

        return null;
    }
Retrieve the filter parameter name to react on.

@return string|null