Answers for "jquery if element has child with class"

detect if an element has a class jQurey

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

check if element has childs jquery

if ( $('#myfav').children().length > 0 ) {
     // do something
}

jquery check if element has child

if ($('#example').find('#test').length) {
    // found!
}

jquery check if a class exists

if ($(".mydivclass")[0]){
    // Do something if class exists
} else {
    // Do something if class does not exist
}