I call a function bit error notify that a function not a function

Question

TypeError: DialogflowHandle.handleMessage is not a function

DialogflowHandle.handleMessage(message.body) // here notify handle not a funtion.

And here is class:

const dialogflow = require('dialogflow');
class DialogflowHandle {

  handleMessage (sentence) {
    this.request.queryInput.text.text = sentence
    return new Promise(
      (resolve, reject) => {
        this.sessionClient.detectIntent(this.request)
          .then(resolve)
          .catch(reject);
      }
    )
  }
}

Avoid the [`Promise` constructor antipattern](https://stackoverflow.com/q/23803743/1048572?What-is-the-promise-construction-antipattern-and-how-to-avoid-it)! — Bergi, Aug 29 '19 at 08:09

score 2 · Answer 1 · answered Aug 29 '19 at 07:49

2

handleMessage is a method available on instances of DialogflowHandle. It isn't available as a method of the DialogflowHandle constructor function.

const dfh = new DialogflowHandle();
dfh.handleMessage(message.body);

answered Aug 29 '19 at 07:49

Quentin

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if I use : const dfh = new DialogflowHandle(); dfh.handleMessage(message.body) Error is :TypeError: DialogflowHandle is not a constructor – Nguyễn Nhi Phát Aug 29 '19 at 07:55
@NguyễnNhiPhát — I can't reproduce that problem: https://jsbin.com/sidepeyegi/1/edit?js,console It must have something to do with code you haven't shared with us. – Quentin Aug 29 '19 at 08:21

score 0 · Answer 2 · answered Aug 29 '19 at 07:52

You should add static keyword to your handleMessage method in order you want it to be accessed without creating DialogflowHandle object:

const dialogflow = require('dialogflow');
class DialogflowHandle {

  static handleMessage (sentence) {
    this.request.queryInput.text.text = sentence
    return new Promise(
      (resolve, reject) => {
        this.sessionClient.detectIntent(this.request)
          .then(resolve)
          .catch(reject);
      }
    )
  }
}

The function cares about the value of `this` so that doesn't seem like a great solution. — Quentin, Aug 29 '19 at 07:54

I call a function bit error notify that a function not a function

2 Answers2