Is it possible to achieve Ajax file/image uploading using tastypie, backbone, and knockout together?

I'm struggling with incorporating file/image uploads using tastypie, backbone, and knockout

[knockout] I'm not sure how to specify the data-bind for the input field to enable file uploads:

// current implementation
<input type="file" data-bind="value: image"/>

[backbone] Although I have set the post URL, the uploaded file is treated as a string in this scenario

imageModel.get("image") //returns a string like C:/image

[tastypie] After saving the model, the FileField remains only a string instead of uploading the actual file. It does not follow the expected upload_to=... django dynamics

# code snippet from my tastypie resource

class ImageResource(ModelResource):

    image = fields.FileField(attribute="image")
    # ...

This question covers multiple areas, so finding a single solution for all might be challenging. Can someone offer guidance on the backbone to tastypie (sending text only) and the tastypie to db (absence of upload_to causing files not to save) issues?

Answer №1

If you want to get the actual file object instead of just the filename using a value binding, you'll need to create a custom binding. I created one for my project and used the FileReader HTML5 object to send the file to the server.

ko.bindingHandlers.file = {
    init: function (element, valueAccessor, allBindingsAccessor) {
        ko.utils.registerEventHandler(element, "change", function () {
            writeValueToProperty(valueAccessor(), allBindingsAccessor, "file", element.files[0]);
        });
    },
    update: function (element, valueAccessor) {
        if (ko.utils.unwrapObservable(valueAccessor()) == null) {
            element.value = "";
        }
    }
};

http://jsfiddle.net/b85YC/

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