javascript - How can I make my navbar stick to the bottom of an element upon reaching it? -


okay, i'm trying navbar stick bottom of 25px tall header have @ top of page. want navbar stick (become fixed — position: fixed) when reaches bottom of header.

a link codepen set can found below. apologize css , javascript/jquery stuff you'll see.... it's part of site/design though.

i can't navbar (located @ bottom of screen) become fixed when reaches bottom of 25px (black-ish) header @ top of screen. i've tried 10+ solutions different places , none of them doing trick me....

http://codepen.io/anon/pen/wrzjwg

what need add class nav first since have nav absolutely positioned in window find window height , minus nav , top bar have , add , remove classes there. following work: 

$(window).on('scroll', function () {   if ( $(window).scrolltop() >= $(window).height() - 105) {     $( '#mainnav' ).addclass("scrolled");   }else{     $( '#mainnav' ).removeclass("scrolled");   } });

then css

#mainnav.scrolled { /* take place when navbar reaches set point on page */   position: fixed;   z-index: 99;   top:25px;   left:0; }

normally use $('div').offset().top instead of $(window).height() - 105 nav absolutely positioned in window , not in relative div cause inconsistent results find windows height , subtract height of nav , top bar. nav should fixed in correct position once scrolled bottom of top bar. here working codepen codepen


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