Function add_button

wasm/notebook/snippets/python-js-css/javascript.js:11–34

(buttonText, cb)

        return () => input.value;
    },
    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
            return do_button;
        } else {
            do_button(cb);
        }
    },
    add_output() {
        const resultDiv = document.createElement('div');
        resultDiv.classList.add('result');