.. _javascriptextensionrst:

===================================
Javascript extension for a notebook
===================================


.. only:: html

    **Links:** :download:`notebook <javascript_extension.ipynb>`, :downloadlink:`html <javascript_extension2html.html>`, :download:`PDF <javascript_extension.pdf>`, :download:`python <javascript_extension.py>`, :downloadlink:`slides <javascript_extension.slides.html>`, :githublink:`GitHub|_doc/notebooks/javascript_extension.ipynb|*`


Play with Javascript extensions.

.. code:: ipython3

    from pyquickhelper.ipythonhelper import install_notebook_extension, get_installed_notebook_extension

We install extensions in case it was not done before:

.. code:: ipython3

    install_notebook_extension()




.. parsed-literal::
    ''



We check the list of installed extensions (from
`IPython-notebook-extensions <https://github.com/ipython-contrib/IPython-notebook-extensions/wiki>`__):

.. code:: ipython3

    from pyquickhelper.ipythonhelper.notebook_helper import get_jupyter_extension_dir
    path = get_jupyter_extension_dir()
    path




.. parsed-literal::
    'C:\\ProgramData\\jupyter\\nbextensions'



.. code:: ipython3

    get_installed_notebook_extension()




.. parsed-literal::
    ['jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/addbefore/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/autosavetime/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/autoscroll/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/chrome-clipboard/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/codefolding/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/codemirror_mode_extensions/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/collapsible_headings/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/comment-uncomment/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/contrib_nbextensions_help_item/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/css_selector/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/datestamper/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/dragdrop/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/equation-numbering/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/exercise/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/exercise2/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/export_embedded/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/freeze/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/gist_it/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/go_to_current_running_cell/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/hide_header/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/hide_input/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/hide_input_all/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/init_cell/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/keyboard_shortcut_editor/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/limit_output/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/load_tex_macros/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/move_selected_cells/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/navigation-hotkeys/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/nbTranslate/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/printview/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/python-markdown/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/rubberband/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/ruler/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/runtools/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/scratchpad/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/scroll_down/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/search-replace/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/select_keymap/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/skill/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/skip-traceback/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/snippets/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/snippets_menu/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/spellchecker/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/table_beautifier/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/toc2/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/toggle_all_line_numbers/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/varInspector/main',
     'jupyter_contrib_nbextensions-master/src/jupyter_contrib_nbextensions/nbextensions/zenmode/main']



.. code:: ipython3

    import notebook
    notebook.nbextensions.check_nbextension('autosavetime', user=True)




.. parsed-literal::
    False



And then, we load one of them:

.. code:: javascript

    %%javascript
    
    require(['base/js/utils'],
    function(utils) {
        utils.load_extensions('autosavetime/main');
    });



.. parsed-literal::
    <IPython.core.display.Javascript object>


.. code:: ipython3

    print(3)


.. parsed-literal::
    3


Does not really work as it is now.