Function do_button

wasm/notebook/snippets/python-js-css/javascript.js:12–26

(callback)

    },
    add_button(buttonText, cb) {
        const do_button = (callback) => {
            const btn = document.createElement('button');
            btn.innerHTML = buttonText;
            btn.addEventListener('click', () => {
                try {
                    // python functions passed to js have a signature
                    // of ([args...], {kwargs...}) => any
                    callback([], {});
                } catch (err) {
                    // puts the traceback in the error box
                    handlePyError(err);
                }
            });
            pushNotebook(btn);
        };

        if (cb == null) {
            // to allow using as a decorator