Help Posting form with file input using elemental

I've been working on file uploading to AppEngine using the blob store. I would like to do so in the background using elemental (no suggestions for 3rd party libraries please.) I think I have it mostly figured out but I can't figure out the code to get the form data from the form element.

The java script should look like this:

                            var formElement = document.getElementById("formElementID");

                            var request = new XMLHttpRequest();

                            request.open("POST", "urltopostto");

                            request.send(new FormData(formElement));

Here's my java code with elemental. The last line has the part I can't figure out.

                            FormElement formElement = (FormElement) Browser.getDocument().getElementById("uploadForm");

                            XMLHttpRequest request = Browser.getWindow().newXMLHttpRequest();

                            request.open("POST", uploadUrl);

                            request.send(!!!NEED FORM DATA FROM MY FORM ELEMENT HERE!!!!);

General guidance on how to map JS to Elemental code would be great.

 

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