Answers for "jquery check how many div with certain class"

count all elements with class jquery

var numItems = $('.item').length;

jQuery hasClass() - check for more than one class

element.is('.class1, .class2')
// works, but it's 35% slower than

element.hasClass('class1') || element.hasClass('class2')

//https://stackoverflow.com/questions/2214952/jquery-hasclass-check-for-more-than-one-class