Как сделать progress bar?

$('li').click(function () {
            $.ajax({
                url: "index.html", 
                success: function (html) { 
                    indexSection = $('.current').index('section') + 1;
                    var width = 100 / indexSection;
                    var rounds = Math.ceil(width); 
                    $(".progress").html('<div class="progress-bar progress-bar-striped progress-bar-animated" role="progressbar" aria-valuenow="75" aria-valuemin="0" aria-valuemax="100" style="width: ' + rounds + '%"></div>'); 
                }
            });
        });