| public addPlaceholder ( integer | null $order = null ) | ||
| $order | integer | null | Defines the order. The lower the order the earlier the sparkline will be displayed. By default the sparkline will be appended to the end. |
public function addPlaceholder($order = null)
{
$this->sparklines[] = array('url' => '', 'metrics' => array(), 'order' => $this->getSparklineOrder($order));
}