I use http://www.dropzonejs.com/ so that users can drag&drop images in the browser, so that they can then interact with them using JavaScript, so no server-side is involved.
How can I stop Dropzone.js from trying to upload the files?
How can I then access the dragged files via JavaScript (create a new <img> tag containing that image)?
Currently I get this error:

I create the dropzone like this:
<form action="/file-upload"
class="dropzone"
id="my-awesome-dropzone">
</form>
I want the functionality to be the same as their demo on their website, where you can drag images but they are not uploaded.
Thanks!