public function getFilterHtmlOptions()
    {
        $r = '';
        if ($this->htmlClass) {
            $this->filterHtmlOptions['class'] = (isset($this->filterHtmlOptions['class']) ? $this->filterHtmlOptions['class'] . ' ' : '') . $this->htmlClass;
        }
        foreach ($this->filterHtmlOptions as $k => $v)
            $r .= "$k = '$v' ";
        return $r;
    }