how to use Jquery :focus selector on input elements in iOS?
===

I'm using Jquery 1.7.1 and iPad1 iOS3.

I need to fire a function on scrollstart unless an input element has focus. The function below worked for a long time, but all of a sudden it doesn't (looking aroud I guess because of switching to Jquery 1.7.1)

    $(document).on('scroll', function(){
       if ( !$("input:focus").length > 0 ) {  
           self.hideAllPanels();
           }
      });

Specifically **$('input:focus').length = 0**, although I can detect the focus event triggering before the scroll event.

I have been fiddling with a workaround using:

     if ( !$(document.activeElement).get(0).tagName == "input" ){
     ....
     }

But I'm not sure when the activeElement is changing, because it seems to persist for quite a while even after I'm "leaving" the resprective element.

**Question**:  
Any idea why I can't detect the focus-ed element on iOS? Some hints how I could set this up with activeElement, so on blur, I'm no longer having the input as activeElement are also welcome!

Thanks for help!