/**
  * @param FilterInterface $filter
  * @return string
  */
 public function render(FilterInterface $filter)
 {
     $this->assign('filterItems', $filter->getItems());
     $html = $this->_toHtml();
     $this->assign('filterItems', []);
     return $html;
 }
 /**
  * {@inheritDoc}
  */
 public function render(FilterInterface $filter)
 {
     $html = '';
     $this->filter = $filter;
     if ($this->canRenderFilter()) {
         $this->assign('filterItems', $filter->getItems());
         $html = $this->_toHtml();
         $this->assign('filterItems', []);
     }
     return $html;
 }