The fabrik loader object allows you to mask of sections of the page whilst they are being updated via an Ajax request.
The loader object is found here:
The 'start' method takes two properties, the DOM node's id that you want to place the loader over, and the loading message.
to overlay on a div id="hideme":
HTML:
<div id="hideme">this will be masked out</div>
You would use this code:
Fabrik.loader.start('hideme', 'loading ....... ');
To then remove the loader you use:
Fabrik.loader.stop('hideme');
to show a loading overlay that covers the whole page
Fabrik.loader.start(null, 'loading msg ');