[jQuery] Re: problems with ajaxSubmit and files when file(s) not selected

[Mike Alsup]

> This works fine as long as the user selects a file. The file plus the
> text form elements are send to the server. Some intercepted traffic:
>
> -----------------------------7d92e142190a
> Content-Disposition: form-data; name="UserId"
>
> 9bdfa5be-0608-4c14-92cd-defc92d64850
> -----------------------------7d92e142190a
> Content-Disposition: form-data; name="address_uid"
>
> 1
> -----------------------------7d92e142190a
> Content-Disposition: form-data; name="IsLockedOut"
>
> False
>
> The body(?) has elements that are separated by the boundary string (in
> this case 7d92e142190a). However, if the user does not select a file
> the body's intercepted traffic looks like this:
>
> UserId=3d7edf4d-84cb-4d03-87fa-26edfbebc6a0&address_uid=3&IsLockedOut=false&username=test&email=
>
> (more like a GET request)
>

If you want to force the multipart enctype then set the iframe option
to true.

var options = {
    iframe: true,
    url: "<%= Url.Content("../../Account/Upload") %>",
    // other options...
});