JSFiddle - React, Tailwind, and code Playground

by Emily Humphrey

HTML

<!DOCTYPE html>
<html>
  <head>
        <title>Slider Change</title>
  </head>

  <body>
    <div id="wrapper">
      <aside id="lifestyle-sidebar">

      </aside>

      <div id="sections">
        <section id="one" class="section">
          <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia...

CSS

#wrapper              {width: 960px;}
      #lifestyle-sidebar    {float: left; height: 300px; width: 200px; background: #911;}
        #lifestyle-sidebar.fixed                 {position: fixed; top: 0;}


      #sections             {float: right; width: 700px; min-height: 500px;}
       #sections #one        {color: #777;}
       #sections #two        {color: #555;}
       #sections #three        {color: #333;}

JavaScript

//capabilities slider
     var top = $('#lifestyle-sidebar').offset().top - parseFloat($('#lifestyle-sidebar').css('margin-top').replace(/auto/, 0));
     $(window).scroll(function (event){
       // what the y position of the scroll is
       var y = $(this).scrollTop();
       // whether that's below the form
       if (y >= top) {
         // if so, add the fixed class
        $('#lifestyle-sidebar').addClass('fixed');
       } else {
        // otherwise remove it
         $('#lifestyle-sidebar').removeClass('fixed');
       }
         
         var lifeStylePos = $('#lifestyle-sidebar').offset().top - y,
             onePos = $("#one").offset().top - y,
             twoPos = $("#two").offset().top - y,
             threePos = $("#three").offset().top - y;

         if(lifeStylePos  > threePos){
             $('#lifestyle-sidebar').css({'background' : 'green'});
         }else if(lifeStylePos > twoPos){
              $('#lifestyle-sidebar').css({'background' : 'blue'});
         }else if(lifeStylePos  > onePos){
              $('#lifestyle-sidebar').css({'background' : 'red'});
         }
     });