jQuery-powered AJAX downloader

download.js

// http://www.adequatelygood.com/JavaScript-Module-Pattern-In-Depth.html
// http://stackoverflow.com/a/20354786

var UTIL = (function (parent, $, undefined) {
    var my = parent._private = parent._private || {};

    my.iframeform = function (url, callback) {
        var object = this;
        object.time = new Date().getTime();
        object.callback = callback || function (){};
        
        object.form = $('<form action="' + url + '" target="iframe' + object.time + '" method="post" style="display:none;" id="form' + object.time + '"></form>');

        object.addParameter = function (parameter, value) {
            $("<input type='hidden' />")
                .attr("name", parameter)
                .attr("value", value)
                .appendTo(object.form);
        }

        object.send = function () {
            var iframe = $('<iframe data-time="' + object.time + '" style="display:none;" id="iframe' + object.time + '" name="iframe' + object.time + '"></iframe>');
            $("body").append(iframe);
            $("body").append(object.form);
            object.form.submit();
            iframe.on( "load", function (event) { 
                $('#form' + $(this).data('time')).remove();
                $(this).remove(); 
                
                // execute callback
                object.callback(event);
                });
        }
    }

    return parent;
} (UTIL || {}, jQuery));