Mat-Autocomplete formControlName

Question

我在 Mat-Autocomplete 上使用 formControlName 时遇到问题。我不知道为什么，但我的 formControlName 不会发送数据，是我写错了吗？当我尝试从 HTML 中删除 [formControl] 时，它总是无法过滤。

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 是我获取银行列表的地方，_validationService 是我获取每个表单名称验证的地方。

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

首先，初始化表单控件是很好的：

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

用

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

并解决问题

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

用

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

它应该可以解决您的问题。