Sample on how to implement loading indicator in Sproutcore application

LoadingIndicatorSample.js

SC.Request.manager.inflight.addObserver('[]', function(array) {
  var length=array.get('length');
  SC.debug('Number of inflight requets are %@', length);
  // Need to run with the SC Event Loop to update the visuals 
  SC.run(new function() {
    App.mainPage.getPath('mainPane.loading').set('isVisible', length > 0);
  });
});