gistfile1.js

xhr.upload.addEventListener("progress", function (e) {
  if (e && e.lengthComputable) {
    p = (e.loaded / e.total);
    var percent = Math.ceil(p * 1000) / 10;
    $("#uploadprogress").val(e.loaded);
    $("#uploadprogress").attr("max", e.total);
    $("#progress").text("Uploading... " + percent + "%");
  }
});

xhr.upload.addEventListener("load", function(e) {
  $("#uploadprogress").attr("value", false);
  $("#uploadprogress").attr("max", false);
  $("#progress").text("Checking file..."); 
});

xhr.addEventListener("readystatechange", function(e) {
  if (this.readyState === 4) {
    $("#progress").text("File is done being checked..."); 
  }
});