javascript - Not so simple scrolling -


i don't know how describe have, i'm showing code

<div class="room-pos"> <div class="right-content nano-content">     <div id="right-fix">      </div> </div>     <div class="left-content ">      </div> </div>  .room-pos{     position: relative; }  .fixed-c{     position:fixed; }  .right-content{     background: #fff none repeat scroll 0% 0%;     width: 45%;     position: absolute;     right: 0;     top:0;     bottom:0;     z-index:5;     border-left: 1px solid #f2f2f2; } .left-content{     width: 55%;     float: left; }  $(window).scroll(function() {       if ($(this).scrolltop() >= $('#right-fix').height() - $(window).height() + 30) {         $('#right-fix').addclass( "fixed-c");         $("#right-fix").css("top", $(window).height() - $('#right-fix').height() );       } else if($(this).scrolltop() < $('#right-fix').height() - $(window).height() + 30) {         if ($('#right-fix').hasclass( "fixed-c")){           $('#right-fix').removeclass( "fixed-c");         }       }

});

same code in jsfiddle

what want build:

so when scroll down scrolltop parameter, right block becomes fixed , top: - px top: -832px . want change when right block becomes fixed, , after start scroll top of page, right block starts scroll top too. so, when scroll bottom, right block scrolls bottom , becomes fixed, , when scroll top right scrolls top, too. think must change top in css parametr dynamic, that

i'm having hard time explaining mean - hope understands.

update: new link demo!

update 2: add wnat build bugs in algorithm code example


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