jquery observe class change
var $div = $("#foo");
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(mutation) {
if (mutation.attributeName === "class") {
var attributeValue = $(mutation.target).prop(mutation.attributeName);
console.log("Class attribute changed to:", attributeValue);
}
});
});
observer.observe($div[0], {
attributes: true
});
$div.addClass('red');