Mat-Autocomplete formControlName

Question

I have issue using formControlName on Mat-Autocomplete. i dont know why but my formControlName wont send the data, am i put it wrong? When i try to remove [formControl] from HTML, its always cant filter.

HTML

<form [formGroup]="form" #legalDataFrm="ngForm" autocomplete="off" fxLayout.gt-sm="column" fxFlex="1 1 auto" novalidate>
  <input type="text" placeholder="Pilih Bank" 
    formControlName="bankName" matInput 
    [formControl]="myControl" [matAutocomplete]="auto">
    <mat-autocomplete 
    #auto="matAutocomplete" 
    (optionSelected)='onChangeBank()' 
    [displayWith]="displayFn">
      <mat-option>Pilih Bank</mat-option>
      <mat-option *ngFor="let option of filteredOptions | async" [value]="option">
        {{option.bankName}}
      </mat-option>
    </mat-autocomplete>
</form>

TS _bankService is where i get the Bank List, _validationService is where i get the validation for each form name.

export class FpLegalDataFormComponent implements OnInit, OnDestroy {
form: FormGroup;
myControl = new FormControl();
options: User[];
filteredOptions: Observable<User[]>;

constructor(
private activatedRoute: ActivatedRoute,
private formBuilder: FormBuilder,
public _validationsService: ValidationsService,
public _bankService: BankService
) {
}
 this.form = this.formBuilder.group({
  bankName      : [bankName, Validators.required]
});
displayFn(user?: User): string | undefined {
return user ? user.bankName : undefined;
}

private _filter(name: string): User[] {
const filterValue = name.toLowerCase();

 return this.options.filter(option => 
 option.bankName.toLowerCase().indexOf(filterValue) > -1);
 }
 private initDropdown() {
 this._bankService.getBank().then((response) => {
   console.log(response.data.bankList)
   this.options = response.data.bankList;
   console.log(this.options)
   this.filteredOptions = this.myControl.valueChanges
   .pipe(
     startWith<string | User>(''),
     map(value => typeof value === 'string' ? value : value.bankName),
     map(name => name ? this._filter(name) : this.options.slice())
   );
 })
}

Answer 1

First of all it's good to initialize the form control so insted of:

this.form = this.formBuilder.group({
  bankName      : [bankName, Validators.required]
});

use

this.form = this.formBuilder.group({
  bankName: new FormControl(bankName, Validators.required)
});

and to fix the problem insted of

<input type="text" placeholder="Pilih Bank" 
    formControlName="bankName" matInput 
    [formControl]="myControl" [matAutocomplete]="auto">

use

<input type="text" placeholder="Pilih Bank" matInput 
    [formControl]="form.get('bankName')" [matAutocomplete]="auto">

it should fix your problem.

Answer 2

TS:

public form: FormGroup = this.formBuilder.group({
    control: [undefined, [Validators.required]],
});
//
this.filtered = this.signupForm.controls.control.valueChanges.pipe(...);

HTML:

<mat-form-field>
  <input
    type="text"
    matInput
    [matAutocomplete]="auto"
    formControlName="control"
  >
  <mat-autocomplete
    autoActiveFirstOption
    #gymAuto="matAutocomplete"
    (optionSelected)="form.controls.control.setValue($event.option.value)"
  >
    <mat-option
      *ngFor="let option of filtered | async"
      [value]="option"
    >
      {{option.name}}
    </mat-option>
  </mat-autocomplete>
</mat-form-field>