如何使用nodejs在dialogflow的卡片响应中添加多个按钮？

Question

I am trying to add more than one button in facebook messenger card response using dialogflow nodejs. I am able to do that from dialogflow console but not with the code

const welcome = (agent) => { agent.add(`Welcome to my Khoon hazir. It is an online blood bank. How may i help you?`);
    agent.add(new Card({
        title: `Khoon hazir`,
        imageUrl: 'https://images.pexels.com/photos/355296/pexels-photo-355296.jpeg?auto=compress&cs=tinysrgb&dpr=1&w=500',
        text: `This is an online Blood bank, aim to save lives`,
        buttonText: 'Need Blood',
        buttonUrl: 'https://www.facebook.com/khoon.hazir/'
    }));        
}

Answer 1

According to this https://github.com/dialogflow/dialogflow-fulfillment-nodejs/blob/master/src/rich-responses/card-response.js . You cannot do that directly. You have to edit the library code to do that. Just edit the code between line numbers 274 and 279 to support the multiple buttons.

Answer 2

I created this unofficial fork that support multi buttons: https://github.com/fabio-C/dialogflow-fulfillment-nodejs

Tested Only of Facebook/Messanger Platform.