jupyter_contrib_nbextensions/nbextensions/usability/hide_input/main.js

// Adds a button to hide the input part of the currently selected cells

// Prevent this script from cluttering the IPython namespace
(function (IPython) {
    "use strict";


    var hide_input = function () {

        // Find the selected cell
        var cell = IPython.notebook.get_selected_cell();
        // Toggle visibility of the input div
        cell.element.find("div.input").toggle('slow')

        if ( cell.metadata.input_collapsed ) {
            cell.metadata.input_collapsed = false;
        } else {
            cell.metadata.input_collapsed = true;
        }
    };


    var init_hide_input = function(){

        // Add a button to the toolbar
        IPython.toolbar.add_buttons_group([{
            label:'hide input',
            icon:'fa-chevron-up',
            callback:hide_input,
        }]);

        // Collapse all cells that are marked as hidden
        var cells = IPython.notebook.get_cells();
        cells.forEach( function(cell){
            if( cell.metadata.input_collapsed ){
                cell.element.find("div.input").toggle(0);
            }
        }
                     );

                     // Write a message to the console to confirm the extension loaded
                     console.log("hide_input cell extension loaded correctly");

                     return true;
    };


    // Initialize the extension
    init_hide_input();

}(IPython));