jQuery sending file with ajax to MVC Controller

Question

I'm trying to send a file using jQuery to my MVC controller but the action keeps receiving a null HttpPostedFileBase parameter.

HTML:

<input type="file" name="file" id="file" />
<input type="submit" name="submit" id="upload" value="Submit"/>

jQuery:

$(function () {
    $('#upload').click(function () {

        var data = new FormData($('#file')[0].files[0]);

        $.ajax({
            url: '@Url.Action("Upload", "Home")',
            type: 'POST',
            data: data,
            cache: false,
            contentType: false,
            processData: false
        });
    });
});

Controller:

[HttpPost]
public virtual ActionResult Upload(HttpPostedFileBase file)
{
    // file = null
}

new FormData($('#file')[0].files[0]):

__proto__: FormData

$('#file')[0].files[0]:

lastModified: 1445429215528
lastModifiedDate: Wed Oct 21 2015 14:06:55 GMT+0200 (Central Europe Daylight Time)
name: "Google_Chrome_logo_2011.jpg"
size: 5506
type: "image/jpg"
webkitRelativePath: ""
__proto__: File

I pretty much copied the code from other examples that I found on the internet but somehow it is just not working.

Well you can get some help from this question and answer mentioned here — Guruprasad J Rao
– Guruprasad J Rao, Commented Oct 21, 2015 at 13:24

score 8 · Accepted Answer · 2015-10-21 13:43:18Z

8

Try this:

if (Request.Files.Count > 0)
{
   foreach (string file in Request.Files)
   {
      var _file = Request.Files[file];
   }
}

UPDATE

var $file = document.getElementById('file'),
    $formData = new FormData();

if ($file.files.length > 0) {
   for (var i = 0; i < $file.files.length; i++) {
      $formData.append('file-' + i, $file.files[i]);
   }
}

$.ajax({
   url: '/home/upload',
   type: 'POST',
   data: $formData,
   dataType: 'json',
   contentType: false,
   processData: false,
   success: function ($data) {

   }
 });

edited Oct 21, 2015 at 13:43

answered Oct 21, 2015 at 13:27

user4090029

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2 Comments

Sam Over a year ago

Just tested it and Count result is 0

Learner Over a year ago

Is it possible with out FormData

keivan kashani · Accepted Answer · 2021-09-23 08:40:01Z

This is my Solution

var formData = new FormData();
var files = $('input[type=file]');
for (var i = 0; i < files.length; i++) {
if (files[i].value == "" || files[i].value == null) {
 return false;
}
else {
 formData.append(files[i].name, files[i].files[0]);
}
}
var formSerializeArray = $("#Form").serializeArray();
for (var i = 0; i < formSerializeArray.length; i++) {
  formData.append(formSerializeArray[i].name, formSerializeArray[i].value)
}
$.ajax({
 type: 'POST',
 data: formData,
 contentType: false,
 processData: false,
 cache: false,
 url: '/Controller/Action',
 success: function (response) {
 if (response.Success == true) {
    return true;
 }
 else {
    return false;
 }
 },
 error: function () {
   return false;
 },
 failure: function () {
   return false;
 }
 });

Moritz Ringler · Accepted Answer · 2023-05-17 07:46:07Z

If you are trying to send file to the controller you can use this approach:

var formdata = new FormData();
    formdata.append("YOUR_KEY", $("#ID_OF_Input_Type_File").prop('files')[0]);
    
    $.ajax({
        url: '/Home/UploadFile',
        type: "POST",
        data: formdata,
        contentType: false, // Not to set any content header  
        processData: false, // Not to process data
        success: function (result) {
        alert(result);
    },
        error: function (err) {
        alert(err);
    }
});

And your Controller will look like this:

public ActionResult UploadFile(HttpPostedFileBase YOUR_KEY)
{   
     // your file operations here....
     return Json(result, JsonRequestBehavior.AllowGet);
}

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