cómo agregar una barra de progreso en javascript a un ejemplo de código de formulario

Ejemplo 1: código js para la barra de progreso de descarga de una página web

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="a1" data-filename="filename.xml">Click to download</div>
<script>
$('#a1').click(function() {
    var that = this;
    var page_url = 'download.php';

    var req = new XMLHttpRequest();
    req.open("POST", page_url, true);
    req.addEventListener("progress", function (evt) {
        if(evt.lengthComputable) {
            var percentComplete = evt.loaded / evt.total;
            console.log(percentComplete);
        }
    }, false);

    req.responseType = "blob";
    req.onreadystatechange = function () {
        if (req.readyState === 4 && req.status === 200) {
            var filename = $(that).data('filename');
            if (typeof window.chrome !== 'undefined') {
                // Chrome version
                var link = document.createElement('a');
                link.href = window.URL.createObjectURL(req.response);
                link.download = filename;
                link.click();
            } else if (typeof window.navigator.msSaveBlob !== 'undefined') {
                // IE version
                var blob = new Blob([req.response], { type: 'application/force-download' });
                window.navigator.msSaveBlob(blob, filename);
            } else {
                // Firefox version
                var file = new File([req.response], filename, { type: 'application/force-download' });
                window.open(URL.createObjectURL(file));
            }
        }
    };
    req.send();
});
</script>

Ejemplo 2: barra de progreso de llenado de formulario html5

$("#form input").keyup(function() {

  var numValid = 0;
  $("#form input[required]").each(function() {
    if (this.validity.valid) {
      numValid++;
    }
  });

  var progress = $("#progress"),
    progressMessage = $("#progress-message");

  if (numValid == 0) {
    progress.attr("value", "0");
    progressMessage.text("Complete the form.");
  }
  if (numValid == 1) {
    progress.attr("value", "20");
    progressMessage.text("There you go, great start!");
  }
  if (numValid == 2) {
    progress.attr("value", "40");
    progressMessage.text("Nothing can stop you now.");
  }
  if (numValid == 3) {
    progress.attr("value", "60");
    progressMessage.text("You're basically a hero, right?");
  }
  if (numValid == 4) {
    progress.attr("value", "80");
    progressMessage.text("They are going to write songs about you.");
  }
  if (numValid == 5) {
    progress.attr("value", "95");
    progressMessage.text("SO CLOSE.");
  }

});

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