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Traversing/prevAll

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prevAll[expr] )

Find all sibling elements in front of the current element.
Use an optional expression to filter the matched set.
Arguments:
expr (Optional)String
An expression to filter the previous elements with.
Examples:

Locate all the divs in front of the last div and give them a class.

$("div:last").prevAll().addClass("before");

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
                    "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
  <script src="http://code.jquery.com/jquery-latest.js"></script>
  
  <script>
  $(document).ready(function(){
    $("div:last").prevAll().addClass("before");
  });
  </script>
  <style>
  div { width:70px; height:70px; background:#abc; 
        border:2px solid black; margin:10px; float:left; }
  div.before { border-color: red; }
  </style>
</head>
<body>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
</body>
</html>

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