Jupyter cell to create shortcut (ctl-l) that toggles between scrolling to top of cell and output of cell

scrolltop.js

%%javascript
var selectedCell = 0;
var viewOutput = false;


Jupyter.keyboard_manager.command_shortcuts.add_shortcut('ctrl-l', function (event) {
     function getOutputScrollValue(cell) {
        var percent = 0;
        var ct = cell.output_area.element.offset().top;
        var sme = Jupyter.notebook.scroll_manager.element;
        var h = sme.height();
        var st = sme.scrollTop();
        var t = sme.offset().top;
        var scroll_value =  st + ct - (t + 0.01 * percent * h);
        return scroll_value;
    }
    var index = Jupyter.notebook.get_selected_index();
    var ms = 500;
    var cell = Jupyter.notebook.get_cell(index);
    var outputtop = getOutputScrollValue(cell);
    if (index === selectedCell) {
        if (viewOutput) {
            // scroll to output
            Jupyter.notebook.scroll_manager.element.animate({scrollTop:outputtop}, ms);
        }
        else {
            Jupyter.notebook.scroll_cell_percent(index, 0, ms);
        }
    }
    else {
        viewOutput = false;
        Jupyter.notebook.scroll_cell_percent(index, 0, ms);
    }
    viewOutput = !viewOutput;
    selectedCell = index;

    Jupyter.OutputArea.auto_scroll_threshold = 999; // default 100

    return false;
});