Answers for "jquery check if element by class exists"

detect if an element has a class jQurey

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

jquery check if element has class starting with

/* Answer to: "jquery check if element has class starting with" */

if(!$(this).is('[class*="answerbox"]')) {
    //Finds element with no answerbox class
} else {
    //The element has already an answerbox class
}