refresh

The refresh() method reloads the current instance of the Droppable widget.
The optional parameter options gives the possibility to extend the initial options with the new ones.

<div id="div2" style="width:100px; height:100px; border:1px solid black;">
    Drop items here...
</div>

<script type="text/javascript">
    jQuery(function ($) {
        $("#div2").shieldDroppable();

        $("#div2").swidget("Droppable").refresh();
    });
</script>