In [26]:
# Widget related imports
from IPython.html import widgets
from IPython.display import display, clear_output, Javascript
from IPython.utils.traitlets import Unicode

# nbconvert related imports
from IPython.nbconvert import get_export_names, export_by_name
from IPython.nbconvert.writers import FilesWriter
from IPython.nbformat import read, NO_CONVERT
from IPython.nbconvert.utils.exceptions import ConversionException

Create a text Widget without displaying it. The widget will be used to store the notebook's name which is otherwise only available in the front-end.

In [17]:
notebook_name = widgets.Text()

Get the current notebook's name by pushing JavaScript to the browser that sets the notebook name in a string widget.

In [18]:
js = """IPython.notebook.kernel.widget_manager.get_model('%s').then(function(model) {
    model.set('value', IPython.notebook.notebook_name);
    model.save();
});
""" % notebook_name.model_id
display(Javascript(data=js))

<IPython.core.display.Javascript object>
In [19]:
filename = notebook_name.value
filename
Out[19]:
'Export As (nbconvert).ipynb'

Create the widget that will allow the user to Export the current notebook.

In [20]:
exporter_names = widgets.Dropdown(options=get_export_names(), value='html')
export_button = widgets.Button(description="Export")
download_link = widgets.HTML(visible=False)

Export the notebook when the export button is clicked.

In [29]:
file_writer = FilesWriter()

def export(name, nb):
    
    # Get a unique key for the notebook and set it in the resources object.
    notebook_name = name[:name.rfind('.')]
    resources = {}
    resources['unique_key'] = notebook_name
    resources['output_files_dir'] = '%s_files' % notebook_name

    # Try to export
    try:
        output, resources = export_by_name(exporter_names.value, nb)
    except ConversionException as e:
        download_link.value = "<br>Could not export notebook!"
    else:
        write_results = file_writer.write(output, resources, notebook_name=notebook_name)
    
        download_link.value = "<br>Results: <a href='files/{filename}'><i>\"{filename}\"</i></a>".format(filename=write_results)
        download_link.visible = True
        
def handle_export(widget):
    with open(filename, 'r') as f:
        export(filename, read(f, NO_CONVERT))
        
export_button.on_click(handle_export)

Display the controls.

In [30]:
display(exporter_names, export_button, download_link)

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-21-6a4d11e868fe> in handle_export(widget)
     22 def handle_export(widget):
     23     with open(filename, 'r') as f:
---> 24         export(filename, read(f, 'json'))
     25 export_button.on_click(handle_export)

/home/jon/ipython/IPython/nbformat/__init__.py in read(fp, as_version, **kwargs)
    131             return read(f, as_version, **kwargs)
    132 
--> 133     return reads(fp.read(), as_version, **kwargs)
    134 
    135 

/home/jon/ipython/IPython/nbformat/__init__.py in reads(s, as_version, **kwargs)
     67     nb = reader.reads(s, **kwargs)
     68     if as_version is not NO_CONVERT:
---> 69         nb = convert(nb, as_version)
     70     try:
     71         validate(nb)

/home/jon/ipython/IPython/nbformat/converter.py in convert(nb, to_version)
     52     else:
     53         raise ValueError("Cannot convert notebook to v%d because that " \
---> 54                         "version doesn't exist" % (to_version))

TypeError: %d format: a number is required, not str
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-23-549800f6d03d> in handle_export(widget)
     22 def handle_export(widget):
     23     with open(filename, 'r') as f:
---> 24         export(filename, read(f, 'json', 4))
     25 
     26 export_button.on_click(handle_export)

TypeError: read() takes 2 positional arguments but 3 were given
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-24-549800f6d03d> in handle_export(widget)
     22 def handle_export(widget):
     23     with open(filename, 'r') as f:
---> 24         export(filename, read(f, 'json', 4))
     25 
     26 export_button.on_click(handle_export)

TypeError: read() takes 2 positional arguments but 3 were given
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-27-e5e414ef9f49> in handle_export(widget)
     22 def handle_export(widget):
     23     with open(filename, 'r') as f:
---> 24         export(filename, read(f))
     25 
     26 export_button.on_click(handle_export)

TypeError: read() missing 1 required positional argument: 'as_version'
In [ ]: