Get all data- attributes

JavaScript
1

Is there a way (jQuery is fine) to get all the data- attributes on a page and then change the values in the element’s class to those in the data- attribute?
E.g.

this:


<div class="class1 class 2">
A
</div>
<div class="class1 class 2" data-class-override="class3 class 4">
B
</div>
<div class="class1 class 2">
C
</div>

…becomes:


<div class="class1 class 2">
A
</div>
<div class="class3 class 4">
B
</div>
<div class="class1 class 2">
C
</div>

I need it to search the entire page as they could be anywhere.

I know $(this).data(“class-override”) would get it but how search the whole page and how do it in the best way?

2

Don’t know if this is the best way, but it works:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>Unbenanntes Dokument</title>
    <script src="http://code.jquery.com/jquery-latest.min.js" type="text/javascript"></script>
  </head>
  
  <body>
    <div class="class1 class 2">A</div>
    <div class="class1 class 2" data-class-override="class3 class 4">B</div>
    <div class="class1 class 2">C</div>
    
    <script>
      $(document).ready(function() {
        $("body").find('[data-class-override]').each(function(){
          $(this).removeClass();
          $(this).addClass($(this).attr('data-class-override'));
          $(this).removeAttr('data-class-override');
        });
      });
    </script>
  </body>
</html>