Django JQuery Ajax File Upload

Question

I've been trying to upload a simple text file for hours now but I still can't seem to get it working.

I keep getting invalid forms saying I'm missing the "file_source".

Why is "file_source" not getting posted?

I've also got it to actually send "file_source" but it still says it is missing. What type of element should be given to a Django FileFiled?

Django Form:

class FileUploadForm(forms.Form):
    file_source = forms.FileField()

Django Template (renders form):

<form action="/upload/" method="post" id="file-upload-form" enctype="multipart/form-data"> {% csrf_token %}
    {{ form }}
    <button type="submit" class="btn btn-primary" id='upload-btn'>Upload</button>
</form>

JQuery/Ajax Upload:

function uploadFile() {
$.ajax({
    data: $(this).serialize(),
    type: $(this).attr('method'),
    url: $(this).attr('action')
});
return false;
}

$(function() {
     $('#file-upload-form').submit(uploadFile);
});

Django View Which recieves POST:

def upload_view(request):
if request.is_ajax():
    form = FileUploadForm(request.POST)
    if form.is_valid():
        print 'valid form'
    else:
        print 'invalid form'
        print form.errors
return HttpResponseRedirect('/ingest/')

Solution 1

Here is what I changed to get it working.

1. I used FormData to package up data from form

2. Notice the parameters of the form in the Django view. I was not specifying "files" before and that's what caused the " file field required" error.

Javascript:

function upload(event) {
event.preventDefault();
var data = new FormData($('form').get(0));

$.ajax({
    url: $(this).attr('action'),
    type: $(this).attr('method'),
    data: data,
    cache: false,
    processData: false,
    contentType: false,
    success: function(data) {
        alert('success');
    }
});
return false;
}

$(function() {
    $('form').submit(upload);
});

Django View:

def upload_view(request):
    if request.method == 'POST':
        form = FileUploadForm(data=request.POST, files=request.FILES)
        if form.is_valid():
            print 'valid form'
        else:
            print 'invalid form'
            print form.errors
    return HttpResponseRedirect('/ingest/')

Solution 2

Here's how we can send json data in addition to files using Ajax to Django.

Example:

JS using form-data

var formData = new FormData();
formData.append('file1', myFile); 
const data_ = JSON.stringify(data)
formData.append('data', data_);

doPost(url, formData)
.then(result => {
 })

Django using request.FILES & request.POST

data = json.loads(request.POST.get('data'))
 files = request.FILES
 attached_file1 = files.get('file1', None)
 attr1 = data.get('attr1', None)

Comments

[arnm]

You can use FormData, view my answer

[Jon Snow]

The link I gave also uses FormData, however this won't work on older browsers(caniuse.com/#search=formdata), which is why I gave the other links.

[andilabs]

could you present your form

[whoever]

What's that FileUploadForm you are using?

[arnm]

the form is in my original question

[Filippo Costa]

I used your code and it receives 403 because the CSRF token is missing. Any idea how to solve it?

[Kelvin Barsana]

you can use @csrf_exempt