JAVASCRIPT

get all classes of element jquery

var classList = $('#divId').attr('class').split(/s+/);
$.each(classList, function(index, item) {
    if (item === 'someClass') {
        //do something
    }
});

jquery get all classes of a div

var classes = $('#test').attr('class').split(' ');

alert(classes[0]); // first class
alert(classes[1]); // second class
alert(classes[2]); // third class