[jupyter] Jupyter widget that modifies notebook?

[Titus Barik]

Hi all,

Apologies for the newbie question. 

How does one design a Jupyter widget (DOMWidget) that can modify the notebook 
itself? For example, given a sample DOMWidget, let's say I want a button that 
upon clicking inserts a new cell:

define('hello', ["@jupyter-widgets/base"], function(widgets) {

    var HelloView = widgets.DOMWidgetView.extend({

        // Render the view.
        render: function() {
            this.el = /* creates some sort of HTML button */;
        },
    });

    return {
        HelloView: HelloView
    };
});

Is the right thing to do to modify render, render an HTML button, and then have 
its onclick event perform something like:

IPython.notebook.insert_cell_below('code').set_text('some text');

Or is there some better/more appropriate strategy?

Thanks.

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