Uncaught TypeError: Cannot set property 'model' of undefined

Question

I have a special problem with a callback method and local variable:

 export class Test {

   model: Article;

   onKeyEnter(value: string) {
    this.model.maktx = "Test1";

    //This is not working
    this.find(value);

    // Direct call is working
    //this.readSuccessCallback(null, null);
  }

  find(nr) {

    [..other stuff]

    OData.read(request, this.readSuccessCallback, this.errorCallback);
  }

   readSuccessCallback(data, response) {  
     this.model.maktx = "Test2";
  }
}

The "Test2" value is set correctly when I call readSuccessCallback direct from onKeyEnter

If the readSuccessCallback method is called from the OData.read (SAP Kapsel 3rd Party) an exception occured:

Uncaught TypeError: Cannot set property 'model' of undefined.

Has anyone got an idea what is happening? I don't know exactly what OData.read is doing but it seems that I am not coming back to where I was leaving?

yurzui · Accepted Answer · 2016-08-04 10:33:35Z

2

Try this:

OData.read(request, this.readSuccessCallback.bind(this), this.errorCallback.bind(this));

answered Aug 4, 2016 at 10:33

yurzui

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1 Comment

Saylim Over a year ago

Hi yurzui, thanks for your answer. Your solution is working!

Roy Dictus · Accepted Answer · 2016-08-04 12:53:45Z

0

It seems to me that your readSuccessCallback is called, but that this has become undefined. This may be the case when you are working in strict mode (which I believe is the default mode from 1.8 up).

I can't test this here, but define your callback like so:

public readSuccessCallback(data, response) = (data, response) => {
  this.model.maktx = "Test3";
}

which should lead this to point to your actual instance.

edited Aug 4, 2016 at 12:53

answered Aug 4, 2016 at 10:40

Roy Dictus

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1 Comment

Saylim Over a year ago

Hi Roy, thanks for your answer. This syntax is not working. After the ) is { or ; expected.

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