javascript - Creating a jQuery vertical scroll loop -

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i'm trying write jquery script continually scroll these <p> tags within <div> parent. got idea this site.

function shuffle(){        $('#wrapper > p').each(function(){          h = ($(this).offset().top + 130);          if( h > 500 ){              console.log(h);              $(this).css ('top', 0 );              return;          }            if( h == 270 ){              $(this).addclass('current' );          }            if( h == 360 ){              $(this).removeclass('current' );          }                    $(this).animate({              top: h,              easing: 'easein'          }, 500, '');                    if( h > 1350 ){              $(this).css ('top', 0 );          }      });        window.settimeout(shuffle, 2500);  }    var = 0;            $('#wrapper > p').each(function(){      starter = $(this).css('top', ((i * 90) ) + 'px' );      starterwhite = ($(this).offset().top + 130);      if((i*90) == 270)          $(this).addclass('current');      $(this).css('top', starter );      i++;  });    window.settimeout(shuffle, 2000);
#wrapper {      height: 500px;      overflow: hidden;      position: relative;  }    p {      position: absolute;      margin: 0;      padding: 0;  }    .current {      color: red;  }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <div id="wrapper">      <p>1</p>      <p>2</p>      <p>3</p>      <p>4</p>      <p>5</p>      <p>6</p>      <p>7</p>  </div>

problem when try make scroll <p> tags overlap, , highlighted tag doesn't change. idea how make work? here's jsfiddle of got far.

check this out:

// constants, can play  var step = 90;  var current_index = 3;    // variables calculating  var currenttop = step * current_index;  var nextforcurrenttop = step * (current_index + 1);  var $numbers = $('#wrapper > p');  // in case = 7  var count = $numbers.length;  var secondtolasttop = step * (count - 1);    $numbers.each(function(i) {      var $this = $(this);      $this.css('top', * step + 'px');        if (i === current_index) {          $this.addclass('current');      }  });    window.settimeout(shuffle, 2000);    function shuffle() {      $numbers.each(function() {          $this = $(this);          // calculating new position of element          h = parseint($this.css('top')) + step;            // in case = 540          if (h > secondtolasttop) {              $this.css('top', 0);              return;          }            // in case visually = 3rd element          if (h === currenttop) {              $this.addclass('current');          }            // in case visually = 4th element          if (h === nextforcurrenttop) {              $this.removeclass('current');          }            $this.animate({              top: h,              easing: 'easein'          }, 500, '');      });        window.settimeout(shuffle, 2500);  }
#wrapper {      height: 500px;      overflow: hidden;      position: relative;  }    p {      position: absolute;      margin: 0;      padding: 0;  }    .current {      color: red;  }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <div id="wrapper">      <p>1</p>      <p>2</p>      <p>3</p>      <p>4</p>      <p>5</p>      <p>6</p>      <p>7</p>  </div>

i improved , commented code example, removed magic numbers. can play constants.


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