how to set value in array form with angular

问题:

I want to set value in array like this:

this.form.controls[name].setValue('name')

but I am working with array forms, and this is not working, even if I pass index of the especific array form

for example this is my form array and I want to do is to set value in a function

user: FormGroup;
  users: FormGroup;

  constructor(private fb: FormBuilder) {}
  ngOnInit() {
    this.user = this.buildGroup();
    this.users = this.fb.group({
      data: this.fb.array([this.user])
    });
  }
  get fData() {
    return this.users.get('data') as FormArray;
  }
  buildGroup() {
    return this.fb.group({
      name: ['', [Validators.required, Validators.minLength(2)]],
      account: this.fb.group({
        email: ['', Validators.required],
        confirm: ['', Validators.required]
      })
    });
  }
setValue(index) {
   this.fData[index].controls[name].setValue('name')
  }
  onSubmit() {
    this.fData.push(this.buildGroup());
    const {valid, value} = this.fData;
    console.log(valid, value);
  }

but this.fData[index].controls[name].setValue('name') this is not working

回答1:

For arrays, you need to use setControl. Something like this:

    this.productForm = this.fb.group({
        productName: ['', [Validators.required,
                           Validators.minLength(3),
                           Validators.maxLength(50)]],
        productCode: ['', Validators.required],
        starRating: ['', NumberValidators.range(1, 5)],
        tags: this.fb.array([]),
        description: ''
    });

    ...

    // Update the data on the form
    this.productForm.patchValue({
        productName: this.product.productName,
        productCode: this.product.productCode,
        starRating: this.product.starRating,
        description: this.product.description
    });
    this.productForm.setControl('tags', this.fb.array(this.product.tags || []));

回答2:

Here is what I have done to set value manually in formArray's specific form control and worked for me. I have formArray named as bundleDetails.

   this.formBuilderObj['bundleDetails'] = 
   this.formBuilder.array([this.createBundleItem()]);

    createBundleItem(): FormGroup {
    return this.formBuilder.group({
     bsku: ['', Validators.required],
     bqty: ['', Validators.required],
     bprice: ['', Validators.required]
    });
   }

Method to set bsku control's value (where index is [formGroupName]="i" passed from html file).

   setSku(sku: string, index: number) {
   const faControl = 
   (<FormArray>this.pmForm.controls['bundleDetails']).at(index);
   faControl['controls'].bsku.setValue(sku);
  }

Hope this helps. Happy coding.