Untitled

jQuery Deferreds - Pass result of $.when to $.then
function ajaxfn(data) {
prevalidate(data);
return $.ajax(settings);
}
$.when(ajaxfn).then(function() {
// put 'xyz' on the page somewhere.
});

$.when(ajaxfn()).then(function(data) {
    // put 'xyz' on the page somewhere.
});

function ajaxfn(data) {
    prevalidate(data);
    return $.ajax(settings);
}

ajaxfn().then(function(response) {
    console.debug(response);
});