javascript - Make sticky/fixed element stop at footer -


i'm trying make side bar stop following user's scroll once hits footer. right set z-index -2 goes behind footer, sticks out tiny bit.

javascript

$(document).ready(function () {     var floatingdiv = $('#side_bar');     var floatingdivposition = floatingdiv.position();     $(window).scroll(function (){         var scrollbarposition = $(window).scrolltop();         if(scrollbarposition >= floatingdivposition.top) {             floatingdiv.css({                 'position': 'fixed',                 'top': 55,                 'width': '18.6676%',                 'z-index': -2             });         }         else{             floatingdiv.css({                 'position': 'relative',                 'top': 0,                 'width': '79.4392%'             });         }     }); });

html

<div id="content">   <div id="col_1">     <div id="side_bar">       <h4 id="cater_to">we cater to</h4>       <a href="#"><button class="side_bar_btns">contractor</button></a>       <a href="#"><button class="side_bar_btns">wood/sport floors</button></a>       <a href="#"><button class="side_bar_btns">grocery/commercial</button></a>       <a href="#"><button class="side_bar_btns">education</button></a>       <h4 id="simplicity">simplicity</h4>       <div id="all_systems_side_bar">         <img src="images/all_systems_logo.png" alt="all systems maintenance logo. links more systems maintenance." width="100%">       </div><!-- systems side bar -->     </div><!-- side_bar -->   </div><!-- col_1 -->    <div id="col_2">     //// bunch of stuff here    </div><!-- col_2 -->    <div class="clear"></div> </div><!-- content -->  <footer>     /// bunch of stuff here </footer>

css

#col_1 {     float:left;     margin-top:44px;     width:23.4994%;     margin-left:3.9531%;     }  #side_bar {     background:#003768;     min-height:665px;     width:79.4392%;     border-radius:20px;     box-shadow: 10px 10px 5px #888; }  #col_2 {     float:right;     margin-top:44px;     width:68.5944%;     margin-right:3.9531%; }  footer {     background-image:url(../images/foot_background.gif);     background-repeat:no-repeat;     background-size:cover; }

the footer background same height screen (about 824px when inspect chrome).

found gem on youtube @ https://www.youtube.com/watch?v=5s0l6dcvevk , changed come following, works.

$(function() {    if ($('#side_bar').length) {       var el = $('#side_bar');       var stickytop = $('#side_bar').offset().top;       var stickyheight = $('#side_bar').height();        $(window).scroll(function(){         var limit = $('footer').offset().top - stickyheight - 20;          var windowtop = $(window).scrolltop();          if (stickytop < windowtop) {             el.css({                 position: 'fixed',                 top: 55,                 width: '18.6676%'             });         } else {             el.css({                 position: 'static',                 width: '79.4392%'             });         }          if (limit < windowtop) {             var diff = limit - windowtop;             el.css({                 top: diff             });         }     }); } });

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