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Keyboard Shortcut Customization

Starting with IPython 2.0 keyboard shortcuts in command and edit mode are fully customizable. These customizations are made using the Jupyter JavaScript API. Here is an example that makes the r key available for running a cell:

%%javascript

Jupyter.keyboard_manager.command_shortcuts.add_shortcut('r', {
    help : 'run cell',
    help_index : 'zz',
    handler : function (event) {
        IPython.notebook.execute_cell();
        return false;
    }}
);

“By default the keypress r, while in command mode, changes the type of the selected cell to raw. This shortcut is overridden by the code in the previous cell, and thus the action no longer be available via the keypress r.”

There are a couple of points to mention about this API:

• The help_index field is used to sort the shortcuts in the Keyboard Shortcuts help dialog. It defaults to zz.
• When a handler returns false it indicates that the event should stop propagating and the default action should not be performed. For further details about the event object or event handling, see the jQuery docs.
• If you don’t need a help or help_index field, you can simply pass a function as the second argument to add_shortcut.

%%javascript

Jupyter.keyboard_manager.command_shortcuts.add_shortcut('r', function (event) {
    IPython.notebook.execute_cell();
    return false;
});

Likewise, to remove a shortcut, use remove_shortcut:

%%javascript

Jupyter.keyboard_manager.command_shortcuts.remove_shortcut('r');

If you want your keyboard shortcuts to be active for all of your notebooks, put the above API calls into your custom.js file.

Of course we provide name for majority of existing action so that you do not have to re-write everything, here is for example how to bind r back to it’s initial behavior:

%%javascript

Jupyter.keyboard_manager.command_shortcuts.add_shortcut('r', 'jupyter-notebook:change-cell-to-raw');

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