$(".search.themes li input").change(function() {
  var classes = []

  $(".search.themes li input:checked").each(function(){
    console.log($(this).siblings(".box"))
    var classList = $(this).siblings(".box").attr('class').split(/\s+/);
    $.each( classList, function(index, item){
      if (item != 'box') {
       classes.push(item)
      }
    });
  });

  if (classes.length == 0) {
    $(".eboite").fadeIn();
    return;
  }

  $(".eboite:not(.pub)").hide();
  classes.push("pub");

  $.each( classes, function(index, item){
    $(".eboite."+item).fadeIn()
  });
  console.log(classes);
});