Riz Riz - 2 years ago 176
Javascript Question

uploading file using jquery ajax - null issue

I have been trying this for a couple of hours now without making any headway. Here is the issue: I am trying to upload a file using jquery ajax. On the client side, it seems fine when I debug: I can see the file object, its name, its size, etc.

On the server side, the HttpPostedFileBase request is always null. Below is the code:

//client side
<input type="file" style="visibility:hidden; height:0; width:0;" id="taskFileUpload"/>

//triggered by file input change event
var uploadFile = function (model, e) {

//so far seems good when debugging
var fileUploadRequest = function (url, file) {
url: url,
type: "POST",
data: file,
processData: false

//server side - request is always null!
public HttpResponseMessage uploadFile(HttpPostedFileBase request)
return Request.CreateResponse(HttpStatusCode.OK, request);

EDIT: I figured out the issue. The FormData approach as suggested below wasn't working for me for a different reason: Error 415 Media Type not supported. This had to do with .Net not knowing how to bind to HttpPostedFileBase object. So I did the following and it seems to work:

public HttpResponseMessage uploadFile()
var file = HttpContext.Current.Request.Files.Count > 0 ?
HttpContext.Current.Request.Files[0] : null;
return Request.CreateResponse(HttpStatusCode.OK);

Answer Source

Show this example

function subirArchivo() {
var data = new FormData();
var files = $("#fuArchivo").get(0).files;
// Si se tiene archivo se va a guardar
if (files.length > 0) {
    data.append("Archivo", files[0]);
var ruta = '';
// Make Ajax request with the contentType = false, and procesDate = false
var ajaxRequest = $.ajax({
    type: "POST",
    url: "../ServicioValidaciones.asmx/subirArchivo",
    contentType: false,
    processData: false,
    data: data,
    success: function (result) {
        ruta = result;
ajaxRequest.done(function (xhr, textStatus) {
// Make Ajax request with the contentType = false, and procesDate = false


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