jquery.ajaxQueue.js

/*
 * jQuery.ajaxQueue - A queue for ajax requests
 *
 * (c) 2011 Corey Frang
 * Dual licensed under the MIT and GPL licenses.
 *
 * Requires jQuery 1.5+
 */
(function($) {

    // jQuery on an empty object, we are going to use this as our Queue
    var ajaxQueue = $({});

    $.ajaxQueue = function(url, ajaxOpts) {
        if (ajaxOpts && typeof url === "string") {
            ajaxOpts.url = url;
        } else {
            ajaxOpts = url;
        }
        var jqXHR,
            dfd = $.Deferred(),
            promise = dfd.promise();

        // queue our ajax request
        ajaxQueue.queue(doRequest);

        // add the abort method
        promise.abort = function(statusText) {

            // proxy abort to the jqXHR if it is active
            if (jqXHR) {
                return jqXHR.abort(statusText);
            }

            // if there wasn't already a jqXHR we need to remove from queue
            var queue = ajaxQueue.queue(),
                index = $.inArray(doRequest, queue);

            if (index > -1) {
                queue.splice(index, 1);
            }

            // and then reject the deferred
            dfd.rejectWith(ajaxOpts.context || ajaxOpts, [promise, statusText, ""]);
            return promise;
        };

        // run the actual query
        function doRequest(next) {
            jqXHR = $.ajax(ajaxOpts)
                .done(dfd.resolve)
                .fail(dfd.reject)
                .then(next, next);
        }

        return promise;
    };

})(jQuery);

jquery.ajaxQueue.min.js

/*
 * jQuery.ajaxQueue - A queue for ajax requests
 *
 * (c) 2011 Corey Frang
 * Dual licensed under the MIT and GPL licenses.
 *
 * Requires jQuery 1.5+
 */
!function(a){var b=a({});a.ajaxQueue=function(c,d){function h(b){e=a.ajax(d).done(f.resolve).fail(f.reject).then(b,b)}d&&"string"==typeof c?d.url=c:d=c;var e,f=a.Deferred(),g=f.promise();return b.queue(h),g.abort=function(c){if(e)return e.abort(c);var i=b.queue(),j=a.inArray(h,i);return j>-1&&i.splice(j,1),f.rejectWith(d.context||d,[g,c,""]),g},g}}(jQuery);