Semi-sticky Navigation

This is a demonstration of my semisticky.js jQuery plugin, which lets you create a fixed navigation bar that shows and hides all or part of itself based on scroll behavior. If that description is confusing it's because I don't know what the proper term for this type of interaction is. If you know a better term, please tweet me at @wosephjeber.

Basically, it allows you to create a fixed element at the top of the window that hides all or part of itself when scrolling down and reveals itself when scrolling up. In this demo, I've broken the nav into two sections, hiding only the top section based on the scroll direction.

Here's the plugin code used on this page:

$('nav').semisticky({
  offsetLimit: $('.nav-actions').outerHeight(),
  onScroll: function(delta) {
    $('#delta').html(delta);
    $('#offset').html(this.currentOffsetAmount);
    $('#state').html(this.state);
  }
});  

I'm demonstrating the onScroll() callback by logging some data to that div in the corner. With each scroll event, the plugin calculates the change in scroll position, or delta. If you're scrolling down, the delta is positive. If you're scrolling up, the delta is negative.

And now for some filler text to make this page longer

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