private function appendSimpleRow($contents, $class = '', $header = false)
    {
        // Check width size
        if ($this->hSize == 0) {
            throw new LogicException('There are no headers set on the datatable yet.');
        }

        // Create grid row object
        $gridRow = $this->getFormFactory()->buildHtmlElement('li', '', '', ($class == '' ? 'DataTableRow' : $class));

        // Trim contents to the column size
        if ($this->hSize < count($contents)) {
            array_slice($contents, $this->hSize);
        }

        // Add extra columns
        $contentsCount = count($contents);
        for ($i = 0; $i < $this->hSize - $contentsCount; $i++) {
            $contents[] = $this->getFormFactory()->buildHtmlElement('span');
        }

        // Insert contents to row
        foreach ($contents as $key => $contentValue) {
            // Create item identifier
            $itemIdentifier = '';
            if (gettype($key) == 'string') {
                $itemIdentifier = strtolower(str_replace(' ', '', $key));
            } elseif (gettype($contentValue) == 'string' || gettype($contentValue) == 'integer' || gettype($contentValue) == 'double') {
                $contentValue = '' . $contentValue;
                $itemIdentifier = strtolower(str_replace(' ', '', $contentValue));
            } elseif ($contentValue->tagName == 'span') {
                $itemIdentifier = strtolower(str_replace(' ', '', $contentValue->nodeValue));
            }

            // Set text wrapper
            $gridTextWrapper = $this->getFormFactory()->buildHtmlElement('span', $contentValue, '', 'DataTableTextWrapper');

            // Set item style
            $gridTextWrapper->appendAttr('style', 'max-width:100%;width:100%;box-sizing:border-box;');

            // Create grid cell with given text
            $gridCell = $this->getFormFactory()->buildHtmlElement('div', $gridTextWrapper, '', 'DataTableCell');
            $gridRow->append($gridCell);

            // Set header (if any)
            if ($header && !empty($itemIdentifier)) {
                // Set identifier
                $gridCell->data('column-name', $itemIdentifier);

                // Add sorting icon
                $sortingIcon = $this->getFormFactory()->buildHtmlElement('div', '', '', 'sortingIcon');
                $gridTextWrapper->append($sortingIcon);
            }

            // Set grid item width
            if (empty($this->columnRatios)) {
                $ratio = (!$this->checkable ? 100 : 100 - 8);
                $w = $ratio / $this->hSize;
            } else {
                $w = $this->columnRatios[$key];
            }
            $gridCell->attr('style', 'width:' . $w . '%;');
        }

        // Append grid row to grid list and return the DOMElement
        $this->gridList->append($gridRow);

        return $gridRow;
    }