Answers for "jquery check if class isnt on page"

detect if an element has a class jQurey

$("#EL_ID").hasClass("CLASS_NAME");

jQuery check if class contains any element

jQuery(function ($) {
	if ($(".className").length == 0) {
		$(".element").removeAttr("style").hide();
	}else{
		$(".element").removeAttr("style").show();
	}	
});