knockout.jsでdropzone.jsを使う為のカスタムバインディング。

gistfile1.coffee

ko.bindingHandlers.dropzone =
    init: (element, value_accessor) ->
        passed_value = ko.unwrap value_accessor()
        send_data = passed_value.data
        $target = $(element).dropzone
            url: passed_value.url
            sending: (file, xhr, form_data) ->
                for name, value of send_data
                    if typeof(value) == "function"
                        form_data.append name, value()
                    else
                        form_data.append name, value
            addedfile: () ->
            paramName: "image"
        $target.bind "uploadprogress", passed_value.upload_progress_handler
        $target.bind "success", passed_value.success_handler