Angular- TypeError: Cannot read property 'forEach' of undefined

Question

I am currently watchin a tutorial, and I'm really keeping an eye on what's going on. However, I am constantly getting this error:

ERROR TypeError: Cannot read property 'forEach' of undefined

This is my part of code where I get that:

onSubmit(){
this.service.register().subscribe(
  (res: any) => {
    if (res.succeeded){
      this.service.formModel.reset();
      this.toastr.success('Korisnik kreiran!', 'Registracija uspješna!');
    } else {
      res.errors.forEach((element:any)=>{
        switch (element.code){
          case 'DuplicateUserName':
            this.toastr.error('Korisničko ime se već koristi.', 'Neuspjela registracija.');
          break;
            //Registration failed
          default:
            this.toastr.error(element.description, 'Neuspjela registracija.');
          break;
        }
      });
    }
  },
  err=>{
    console.log(err);
  }
);
}

Does anybody has idea what's going on? Thanks.

Your tutorial seems to be out of sync with the project's angular version. — The Head Rush
– The Head Rush, Commented Apr 27, 2021 at 16:51

Mir entafaz Ali · Accepted Answer · 2021-04-27 18:30:44Z

1

onSubmit(){
this.service.register().subscribe(
  (res: any) => {
    if (res.succeeded){
      this.service.formModel.reset();
      this.toastr.success('Korisnik kreiran!', 'Registracija uspješna!');
    } else {
    if ('errors' in res) {
      res.errors.forEach((element:any)=>{
        switch (element.code){
          case 'DuplicateUserName':
            this.toastr.error('Korisničko ime se već koristi.', 'Neuspjela registracija.');
          break;
            //Registration failed
          default:
            this.toastr.error(element.description, 'Neuspjela registracija.');
          break;
        }
      });
     }
    }
  },
  err=>{
    console.log(err);
  }
);
}

Adding an if block before you loop through errors should resolve the issue. Still let me know if you are still facing any issue.

answered Apr 27, 2021 at 18:30

Mir entafaz Ali

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