Navbar fixed to bottom, stickUp to work only when showing new content

[jppag]

I have a portfolio website that has a hidden content area when you click the "view more" button on the navbar. The navbar is absolute positioned to the bottom of the page.

When you click "view more", the page scrolls up 100px and shows more content.

I want the navbar stickUp to be active only when the navbar reaches the top (with hidden content) and then, when I scroll to the top, my navbar remains as if there were no stickUp.

Is there any way I can do this?