I recently built a long-running custom action, and I need some way of informing the user that their request is processing.

I'm hoping to leverage the existing "loading" animation in Web Access - displaying the loading animation at the start of my javascript before calling webAccessApi.performCustomAction(), and closing the animation during the callback functions.

Is it possible to do this?  I see that it isn't part of the webAccessApi object, but maybe it's doable by using jquery.show(), or .addClass()?

Here is a screenshot of the loading animation for reference: