Angular 2 nested form set value

Question

I am using angular formbuilder to create a nested form. How do I set nested form quantity field value for each form group within updateValue() function in following code.

ngOnInit() {
   this.fastPostingForm = this.fb.group({
      Charges: this.fb.array([
        this.initCharge()
      ])
    });
}

initCharge(){
     return this.fb.group({
      room: ['', Validators.required],
      amount: ['', Validators.required],
      quantity: ['', Validators.required],
    });
 }

 UpdateValue(i) {
    this.fastPostingForm.controls.Charges[i].controls['quantity'].setValue(2); // This is not working
 }

core.es5.js:1020 ERROR TypeError: Cannot read property 'controls' of undefined — Manoj Sanjeewa
– Manoj Sanjeewa, Commented Oct 2, 2017 at 10:42
You are missing one controls? this.fastPostingForm.controls.Charges.controls[i].controls['quantity'].setValue(2); Maybe consider to pass the nested group as parameter instead of index, so that you don't need to go nuts with those long paths :) — AVJT82
– AVJT82, Commented Oct 2, 2017 at 10:43
that give me following error - Property 'controls' does not exist on type 'AbstractControl'. — Manoj Sanjeewa
– Manoj Sanjeewa, Commented Oct 2, 2017 at 10:46

yurzui · Accepted Answer · 2017-10-02 11:30:06Z

1

It should be:

(this.fastPostingForm.controls.Charges as FormArray).controls[i].controls['quantity']
                                                    .setValue(2)

or

this.fastPostingForm.get(['Charges', i, 'quantity']).setValue(2);

or

this.fastPostingForm.get(`Charges.${i}.quantity`).setValue(2);
                        ^^^
                     backtick

or you can even use patchValue method on your form:

this.fastPostingForm.patchValue({
  Charges: [...Array(i), { quantity: '2' }]
});

edited Oct 2, 2017 at 11:30

answered Oct 2, 2017 at 10:46

yurzui

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4 Comments

yurzui Over a year ago

Try the first one i updated it. Just copied from wrong place

Manoj Sanjeewa Over a year ago

first one giving me following error Property 'controls' does not exist on type 'AbstractControl'.

yurzui Over a year ago

Try (this.fastPostingForm.controls.Charges as FormArray).controls[i].controls['quantity'].setValue(2);

yurzui Over a year ago

AbstractControl doesn't have controls property

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