			/**
			* @requires javelin-install
			* javelin-dom
			* @provides phabricator-busy
			* @javelin
			*/

			/**
			* Show a "busy" indicator onscreen so the user knows something awesome is
			* happening, and that the awesome thing isn't the application breaking or
			* locking up.
			*
			* Example usage:
			*
			* JX.Busy.start();
			* // Do something...
			* JX.Busy.done();
			*
			* Calls to `start()` should be paired with calls to `done()`.
			*/
			JX.install('Busy', {

			statics : {
			_depth : 0,
			start : function() {
			var self = JX.Busy;
			if (!self._depth) {
			self._indicator = JX.$N('div', {className: 'busy'});
			self._indicator.style.display = 'none';
			document.body.appendChild(self._indicator);

			// Don't actually show the indicator for a little while, to prevent
			// it from flashing briefly for every Ajax request.
			setTimeout(function() {
			self._indicator && (self._indicator.style.display = '');
			}, 500);
			}
			self._depth++;
			},
			done : function() {
			var self = JX.Busy;
			--self._depth;

			if (!self._depth) {
			JX.DOM.remove(self._indicator);
			self._indicator = null;
			}
			}
			}

			});

phab/webroot/rsrc/js/application/core/Busy.js
ddb1f181c1bestable

Busy.js
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