ajax promises

promise.js

var $promise = $.ajax(options);

$promise
    .then(function(data){
        // data will be from the ajax call
        return data;
    })
    .then(function(data){
        // data will be the data you return from the previous call
        return 'foo';
    }) // as needed
    .done(function(data){
        // data will be the string foo
        return $.ajax(options);
    })
    .done(function(promise)){
        // the promise from the previous ajax call
        promise.then(function(){})
            .done(function(){})
            .fail(function(){});
    })
    .fail(function(error){});