gistfile1.txt

ko.bindingHandlers.fileUpload = {

update: function(element, valueAccessor, allBindingsAccessor){
        var value = ko.utils.unwrapObservable(valueAccessor())
        if(element.files.length && value){
        var file = element.files[0];
        var url = allBindingsAccessor().url

        xhr = new XMLHttpRequest();
        xhr.open("post", url, true);
        xhr.setRequestHeader("Content-Type", "image/jpeg");
        xhr.setRequestHeader("X-File-Name", file.name);
        xhr.setRequestHeader("X-File-Size", file.size);
        xhr.setRequestHeader("X-File-Type", file.type);
        console.log("sending")
        // Send the file (doh)
        xhr.send(file);
        }
  }
}