how to check the class in jquery code example

Example 1: detect if an element has a class jQurey

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

Example 2: jquery hasclass

$( "#mydiv" ).hasClass( "foo" )

Example 3: if a class exists jquery

if ($(".mydivclass").length){
    // Do something if class exists
} else {
    // Do something if class does not exist
}