jquery.fileupload.js 上传插件进度条的问题

jquery.fileupload.js上传，为何在页面中上传完成之后才执行progressall。 是后端程序要返回进度吗？怎么弄呢
环境： mvc
代码：
$("#" + FileID).fileupload({
url: DocumentHost + UploadFile,
dataType: 'text',
type: "POST",
formData: { },
forceIframeTransport: true, //跨域支持
autoUpload: false,
done: function (e, data) {},
add: function (e, data) {},
change: function (e, data) {},
progress: function (e, data) {//设置上传进度事件的回调函数
var progress = parseInt(data.loaded / data.total * 100, 10);
$("#progress_" + FileID).css("width", parseInt(progress) + "%");
$("#complete_" + FileID).html(parseInt(progress) + "%");
},
progressall: function (e, data) {//设置上传进度事件的回调函数
var progress = parseInt(data.loaded / data.total * 100, 10);
$("#progress_" + FileID).css("width", parseInt(progress) + "%");
$("#complete_" + FileID).html(parseInt(progress) + "%");
}
});

 $(function() {
        $('#fileupload').fileupload({
            url:'appVersionController.do?uploadfile',
            dataType : 'json',
            done : function(e, data) {
                data = data.result;
                if (data.success) {
                    var api = frameElement.api;
                    var W = api.opener;
                    $("#url").val(data.attributes.fileName);
                    $("#behind").html(data.msg);
                } else {
                    $("#behind").html(data.msg);
                }
            },
            progressall: function (e, data) {
                var progress = parseInt(data.loaded / data.total * 100,10);
                $('#progress .bar').css(
                        'width',
                        progress + '%'
                    );

            }
        });
    });