problem uploading a file using Ajax.BeginForm() asynchronously

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Hi All,

I'm trying to upload a file using Ajax.BeginForm() but it's not working out.

My View Contains:

C#

@using (Ajax.BeginForm("UploadFile", null, new AjaxOptions { HttpMethod="POST", UpdateTargetId = "result" }, new { enctype = "multipart/form-data" }))
{         
  <label id="lblUploadNewFile" for="fileUploadControl">Upload New File</label>     
  <input type="file" name="fileToUpload" id="fileUploadControl"/>
  <input id="btnFileUpload" type="submit" value="Upload" />
  <span id="result" />            
}

and the corresponding Controller is:

C#

[HttpPost]
public string UploadFile(FormCollection formData)
{
  HttpPostedFileBase file=null;
  try
  {
   file = Request.Files[0];
  }
  catch { }

  if ( file!=null && file.ContentLength > 0)
    {
     file.SaveAs(string.Concat(AppDomain.CurrentDomain.BaseDirectory, Path.GetFileName(file.FileName)));
     return "Successfully Uploaded";
    }
  else
    {
      return "Upload Failed, please try again.";
    }

  }

now, the problem is- It's uploading the file but not doing asynchronous when I remove "jquery.unobtrusive-ajax.js". It does a full postback. When I add "jquery.unobtrusive-ajax.js" it in my view, It's doing asynchronous but not sending upload file in form data. No file is being sent to the server in Request.Files[].

Somebody please help.

Thanks a lot in advance!
-Sunny.

Posted 10-Jun-13 20:36pm

Sunny_Kumar_

Updated 2-Dec-19 0:01am

v2

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James W Burton · Answer 1 · 2014-12-18T00:30:00

I came across this little hack, which resolves the problem of no files for Ajax.BeginForm submissions:

JavaScript

window.addEventListener("submit", function (e) {
    var form = e.target;
    if (form.getAttribute("enctype") === "multipart/form-data") {
        if (form.dataset.ajax) {
            e.preventDefault();
            e.stopImmediatePropagation();
            var xhr = new XMLHttpRequest();
            xhr.open(form.method, form.action);
            xhr.onreadystatechange = function () {
                if (xhr.readyState == 4 && xhr.status == 200) {
                    if (form.dataset.ajaxUpdate) {
                        var updateTarget = document.querySelector(form.dataset.ajaxUpdate);
                        if (updateTarget) {
                            updateTarget.innerHTML = xhr.responseText;
                        } 
                    }
                }
            };
            xhr.send(new FormData(form));
        }
    }
}, true);

Found @ http://www.acnenomor.com/1762557p1/c-mvc3-ajaxbeginform-to-upload-file-not-working

Anupam Singh · Answer 2 · 2013-06-11T21:07:00

Solution 1

Use HttpPostedFileBase instead of FormCollaction.

Posted 11-Jun-13 21:07pm

Anupam Singh