Question

In a post Yahoo, when attaching files, there is a button “Attach more files” when you press it, it becomes one field to insert the file.
Here is the code:

<a href = "javascript: addUploadFields ();" id = "attach_more"> Attach more files </ a>

How can i implement it MVC?

Answer 1

After tyring many unsuccessful solution I got it from

http://lbrtdotnet.wordpress.com/2011/09/02/asp-net-mvc-multiple-file-uploads-using-uploadify-and-jqueryui-progressbar/

click this useful link

 I kept the Url Values in a session



 public JsonResult Upload(HttpPostedFileBase file)
    {
        if (Session["myAL"] == null)
        {
            al = new ArrayList();
        }
        else
            al = (ArrayList)Session["myAL"];

        var uploadFile = file;

            if (uploadFile != null && uploadFile.ContentLength > 0)
            {
                string filePath = Path.Combine(HttpContext.Server.MapPath("~/Content/Uploads"),
                                                   Path.GetFileName(uploadFile.FileName));                    
                al.Add(filePath);
                Session["myAL"] = al;
                uploadFile.SaveAs(filePath);
            }

        var percentage = default(float);

        if (_totalCount > 0)
        {
            _uploadCount += 1;
            percentage = (_uploadCount / _totalCount) * 100;
        }

        return Json(new
        {
            Percentage = percentage
        });
    }

and then retrieved them in my Post Create Action

public ActionResult MultimediaCreate(MultimediaModel newMultimedia)
    {            
        if (ModelState.IsValid)
        {
            db.submitMultimedia(newMultimedia);
            al = (ArrayList)Session["myAL"];
            foreach(string am in al)
            {
                MarjaaEntities me = new MarjaaEntities();
                MultimediaFile file = new MultimediaFile();
                file.MultmediaId = newMultimedia.id;
                file.MultimediaFileUrl = am;
                me.MultimediaFiles.AddObject(file);
                me.SaveChanges();
                Session.Remove("myAL");
            }
            return RedirectToAction("MultimediaIndex");
        }
        return View();
    }