asp.net mvc - Bootstrap Progress Bar for MVC File Upload

Question

Is there an easy way to show a blocking Bootstrap progress bar while a file is loading?

The progress is shown in the status bar in chrome as the file is uploaded:

I'd like the dialog to look something like this

My Action looks something like this:

 [HttpPost]
        public ActionResult Upload(UploadViewModel model)
        {
                using (MemoryStream uploadedFile = new MemoryStream())
                {
                    model.File.InputStream.CopyTo(uploadedFile);                            
                    uploadService.UploadFile(uploadedFile, model.File.ContentType)
                    return View();
                 }
         }

Model:

  public class UploadViewModel
    {
        [Required]
        public HttpPostedFileBase File { get; set; }
    }

View:

@model Bleh.Web.Models.UploadViewModel

@using (Html.BeginForm("Upload", "Home",
  FormMethod.Post, new { enctype = "multipart/form-data", @role = "form" }))
{
   <div class="form-group">
    @Html.LabelFor(m => m.File)
    @Html.TextBoxFor(m => m.File, new { type = "file", @class = "form-control" })
    <strong>@Html.ValidationMessageFor(m => m.File, null, new { @class = "label label-danger" })</strong>
</div>

<div class="form-group noleftpadding">
    <input type="submit" value="Upload File" class="btn btn-primary" />
</div>
}

Is there an easy way to process the percentage that the browser displays and apply it to the progress bar?

Answer 1

Do ajax progress handler do the job?

function uploadFile(){
    myApp.showPleaseWait(); //show dialog
    var file=document.getElementById('file_name').files[0];
    var formData = new FormData();
    formData.append("file_name", file);
    ajax = new XMLHttpRequest();
    ajax.upload.addEventListener("progress", progressHandler, false);
    ajax.addEventListener("load", completeHandler, false);
    ajax.open("POST", "/to/action");
    ajax.send(formData);
}

function progressHandler(event){
    var percent = (event.loaded / event.total) * 100;
    $('.bar').width(percent); //from bootstrap bar class
}

function completeHandler(){
    myApp.hidePleaseWait(); //hide dialog
    $('.bar').width(100);
}

Note: myApp.showPleaseWait(); and myApp.hidePleaseWait(); are defined in the link provided by OP.

(edit: formData and formdata was previously inconsistent)