ASP.NET Display the progress bar/loading for radiobuttonlist & dropdownlist

Question

I am creating an ASP.NET/C# application. I want a progress bar/loading appear when selecting a RadioButtonList & DropDownList. The RadioButtonList & DropDownList is AutoPostBack.

I need to display a progress bar/loading for RadioButtonList & DropDownList.

Thank You.

function ShowProgress() {
        setTimeout(function () {
            var modal = $('<div />');
            modal.addClass("modal");
            $('body').append(modal);
            var loading = $(".loading");
            loading.show();
            var top = Math.max($(window).height() / 2 - loading[0].offsetHeight / 2, 0);
            var left = Math.max($(window).width() / 2 - loading[0].offsetWidth / 2, 0);
            loading.css({ top: top, left: left });
        }, 200);
    }
    $('form').live("submit", function () {
        ShowProgress();
    });