/** * @param string|array|null $columns * @return Ublaboo\DataGrid\Filter\FilterText */ public function setFilterText($columns = NULL) { if (NULL === $columns) { $columns = [$this->column]; } else { $columns = is_string($columns) ? [$columns] : $columns; } return $this->grid->addFilterText($this->key, $this->name, $columns); }