Javascript Messenger Bot:TypeError:无法读取属性';文本';未定义的
我正在开始使用messenger机器人,并出现上述错误。我有以下代码:Javascript Messenger Bot:TypeError:无法读取属性';文本';未定义的,javascript,facebook-messenger,facebook-messenger-bot,Javascript,Facebook Messenger,Facebook Messenger Bot,我正在开始使用messenger机器人,并出现上述错误。我有以下代码: app.post('/webhook', (req, res) => { console.log(req.body); if (req.body.object === 'page') { req.body.entry.forEach((entry) => { entry.messaging.forEach((event) => { if (event.messag
app.post('/webhook', (req, res) => {
console.log(req.body);
if (req.body.object === 'page') {
req.body.entry.forEach((entry) => {
entry.messaging.forEach((event) => {
if (event.message.text === 'buy') {
sendGenericMessage(event)
} else if (event.postback) {
processPostback(event)}
});
});
res.status(200).end();
}
});
function sendGenericMessage(event) {
const senderID = event.sender.id;
var messageData = {
"attachment":{
"type":"template",
"payload":{
"template_type":"generic",
"elements":[
{
...
"buttons":[
{
"type":"postback",
"title":"Purchase",
"payload":"PURCHASE_PAYLOAD"
},{
"type":"postback",
"title":"Start Chatting",
"payload":"DEVELOPER_DEFINED_PAYLOAD"
}
]
}, {
"title":"Welcome to Peter\'s Hats",
"image_url":"https://static.pexels.com/photos/177809/pexels-photo-177809.jpeg",
"subtitle":"We\'ve got the right hat for everyone.",
"buttons":[
{
...
}
]
}
]
}
}
}
request({
url: 'https://graph.facebook.com/v2.6/me/messages',
qs: {access_token: process.env.PAGE_ACCESS_TOKEN},
method: 'POST',
json: {
recipient: {id: senderID},
message: messageData
}
}, function (error, response) {
if (error) {
console.log('Error sending message: ', error);
} else if (response.body.error) {
console.log('Error: ', response.body.error);
}
});
}
function processPostback(event) {
const senderID = event.sender.id;
const payload = event.postback.payload;
if (payload === "PURCHASE_PAYLOAD") {
var message = event.message.text + " payment"
sendMessage(event, message)
}
}
当我输入'buy'时,bot将使用一个通用模板进行回复,当按下'purchase'按钮时,bot崩溃。我的错误日志如下:
我搜索并发现了类似的问题,但与他们的问题相比,我的问题来源于回发,而不是短信。
这里的一些帮助将非常有用,谢谢。正如上所述,您的webhook中的回发呼叫中没有属性“message”
对于回发,您必须访问“payload”属性,而不是访问“message”属性,以获取与回发调用相关的数据(在您的情况下,是按下按钮的有效负载)
为了实现这一点,我将首先在按下的按钮的有效载荷中添加一些东西,如下所示:
"buttons":
[
{
"type":"postback",
"title":"Purchase",
"payload": "{"type": "PURCHASE_PAYLOAD", "message": "WHATEVER YOU WANT"}"
},
{
"type":"postback",
"title":"Start Chatting",
"payload":"DEVELOPER_DEFINED_PAYLOAD"
}
]
entry.messaging.forEach((event) => {
if (event.message) {
if (event.message.text === 'buy') {
sendGenericMessage(event)
}
} else if (event.postback) {
processPostback(event)
}
});
然后我用以下方式重写代码的processPostback函数:
function processPostback(event) {
const senderID = event.sender.id;
const payload = JSON.parse(event.postback.payload);
if (payload.type === "PURCHASE_PAYLOAD") {
var message = payload.message + " payment"
sendMessage(event, message)
}
}
通过这些更改,您实际上将要发送的消息传递到按下的按钮的有效负载中,以便用户按下按钮时,您的代码知道要发送什么
您还需要更改entry.messaging.forEach中的代码。因为您的代码尝试访问event.message属性,而在回发的情况下,该属性不存在(未定义),因此当您尝试访问event.message(event.message.text)的子属性时,代码将以错误退出。因此,如果定义了.message属性,则每次都可以检查以减轻此问题,如下所示:
"buttons":
[
{
"type":"postback",
"title":"Purchase",
"payload": "{"type": "PURCHASE_PAYLOAD", "message": "WHATEVER YOU WANT"}"
},
{
"type":"postback",
"title":"Start Chatting",
"payload":"DEVELOPER_DEFINED_PAYLOAD"
}
]
entry.messaging.forEach((event) => {
if (event.message) {
if (event.message.text === 'buy') {
sendGenericMessage(event)
}
} else if (event.postback) {
processPostback(event)
}
});
你好@christos,谢谢你的回复。我尝试了您的解决方案,但它抛出了一个错误(#100)无效数据。参考上面的错误日志,似乎表明“无法读取文本属性”的错误发生在entry.messaging.forEach。这是否意味着“购买”按钮未被识别为消息?我编辑了我的回复以添加另一个更改代码中的重要更改。:)我在代码中也犯了一个小错误。复制并再次粘贴代码;)