upload form with doc type in ajax

1$(".submitbtn").on("click", function(e) {
2
3    var form = $("#Form");
4
5    // you can't pass Jquery form it has to be javascript form object
6    var formData = new FormData(form[0]);
7
8    //if you only need to upload files then 
9    //Grab the File upload control and append each file manually to FormData
10    //var files = form.find("#fileupload")[0].files;
11
12    //$.each(files, function() {
13    //  var file = $(this);
14    //  formData.append(file[0].name, file[0]);
15    //});
16
17    if ($(form).valid()) {
18        $.ajax({
19            type: "POST",
20            url: $(form).prop("action"),
21            //dataType: 'json', //not sure but works for me without this
22            data: formData,
23            contentType: false, //this is requireded please see answers above
24            processData: false, //this is requireded please see answers above
25            //cache: false, //not sure but works for me without this
26            error   : ErrorHandler,
27            success : successHandler
28        });
29    }
30});
31