jquery ajax promise
$.ajax({
url: "/someurl",
method: "GET",
data: {
a: "a"
})
.done(function(data) {
console.log('success callback 1', data)
})
.done(function(data) {
console.log('success callback 2', data)
})
.fail(function(xhr) {
console.log('error callback 1', xhr);
})
.fail(function(xhr) {
console.log('error callback 2', xhr);
});