Async Javascript evaluation | pywebview
Description: Build GUI for your Python program with JavaScript, HTML, and CSS

# # Async Javascript evaluation

    import webview

    """
    This example demonstrates how to evaluate async JavaScript
    """

    def callback(result):
        print(result)

    def evaluate_js_async(window):
        window.evaluate_js(
            """
            new Promise((resolve, reject) => {
                setTimeout(() => {
                    resolve('Whaddup!');
                }, 300);
            });
            """, callback)

    if __name__ == '__main__':
        window = webview.create_window('Run async Javascript', html='<html><body></body></html>')
        webview.start(evaluate_js_async, window, debug=True)