~/.jupyter/custom/custom.js

custom.js

// leave at least 2 line with only a star on it below, or doc generation fails
/**
 *
 *
 * Placeholder for custom user javascript
 * mainly to be overridden in profile/static/custom/custom.js
 * This will always be an empty file in IPython
 *
 * User could add any javascript in the `profile/static/custom/custom.js` file.
 * It will be executed by the ipython notebook at load time.
 *
 * Same thing with `profile/static/custom/custom.css` to inject custom css into the notebook.
 *
 *
 * The object available at load time depend on the version of IPython in use.
 * there is no guaranties of API stability.
 *
 * The example below explain the principle, and might not be valid.
 *
 * Instances are created after the loading of this file and might need to be accessed using events:
 *     define([
 *        'base/js/namespace',
 *        'base/js/events'
 *     ], function(IPython, events) {
 *         events.on("app_initialized.NotebookApp", function () {
 *             IPython.keyboard_manager....
 *         });
 *     });
 *
 * __Example 1:__
 *
 * Create a custom button in toolbar that execute `%qtconsole` in kernel
 * and hence open a qtconsole attached to the same kernel as the current notebook
 *
 *    define([
 *        'base/js/namespace',
 *        'base/js/events'
 *    ], function(IPython, events) {
 *        events.on('app_initialized.NotebookApp', function(){
 *            IPython.toolbar.add_buttons_group([
 *                {
 *                    'label'   : 'run qtconsole',
 *                    'icon'    : 'icon-terminal', // select your icon from http://fortawesome.github.io/Font-Awesome/icons
 *                    'callback': function () {
 *                        IPython.notebook.kernel.execute('%qtconsole')
 *                    }
 *                }
 *                // add more button here if needed.
 *                ]);
 *        });
 *    });
 *
 * __Example 2:__
 *
 * At the completion of the dashboard loading, load an unofficial javascript extension
 * that is installed in profile/static/custom/
 *
 *    define([
 *        'base/js/events'
 *    ], function(events) {
 *        events.on('app_initialized.DashboardApp', function(){
 *            require(['custom/unofficial_extension.js'])
 *        });
 *    });
 *
 * __Example 3:__
 *
 *  Use `jQuery.getScript(url [, success(script, textStatus, jqXHR)] );`
 *  to load custom script into the notebook.
 *
 *    // to load the metadata ui extension example.
 *    $.getScript('/static/notebook/js/celltoolbarpresets/example.js');
 *    // or
 *    // to load the metadata ui extension to control slideshow mode / reveal js for nbconvert
 *    $.getScript('/static/notebook/js/celltoolbarpresets/slideshow.js');
 *
 *
 * @module IPython
 * @namespace IPython
 * @class customjs
 * @static
 */

define([
    'base/js/namespace',
    'base/js/events'
    ],
    function(IPython, events) {
        events.on("app_initialized.NotebookApp",
            function () {
                IPython.Cell.options_default.cm_config.lineNumbers = true;
            }
        );
    }
);

IPython.keyboard_manager.command_shortcuts.add_shortcut('Ctrl-k', {
    help : 'move up selected cells',
    help_index : 'jupyter-notebook:move-selection-up',
    handler : function (event) {
        IPython.notebook.move_selection_up();
        return false;
    }}
);

IPython.keyboard_manager.command_shortcuts.add_shortcut('Ctrl-j', {
    help : 'move down selected cells',
    help_index : 'jupyter-notebook:move-selection-down',
    handler :  function (event) {
        IPython.notebook.move_selection_down();
        return false;
    }}
);