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How to detect scroll direction

Asked 2011-08-23T00:05:10.180
64

I want to run a function when someone scrolls down on an element. Something like this:

 $('div').scrollDown(function(){ alert('down') });
 $('div').scrollUp(function(){ alert('up') });

But those functions don't exist. Is there a solution to this problem? Awwwards seem to be able to do it (logo in navbar changes depending on scroll direction). Unfortunately, the source code is compressed, so no luck there.

jquery scroll direction
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$(function(){
    var _top = $(window).scrollTop();
    var _direction;
    $(window).scroll(function(){
        var _cur_top = $(window).scrollTop();
        if(_top < _cur_top)
        {
            _direction = 'down';
        }
        else
        {
            _direction = 'up';
        }
        _top = _cur_top;
        console.log(_direction);
    });
});

Demo: http://jsfiddle.net/AlienWebguy/Bka6F/

answered 2011-08-23T00:09:30.190

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