Change header.php after ajax call

Question

Is possible change class to body_class() after ajax call to load posts/pages? I would say no, but I have not used much with wordpress ajax, so I ask the question.

Answer 1

Your best bet would be to change the body class (either add class or remove class) with jQuery after the ajax call as a callback.

$.ajax({
  url: "yourloop.php",
  context: document.body
}).done(function() { 
  $(this).addClass("finished-loop");
});

http://api.jquery.com/jQuery.ajax/