如何在formControl中设置默认值？

Question

我正在尝试在输入字段中设置时间的默认值，但无法使用“值”属性来完成。

<input class="form-control" name="absolute type="time" value="23:59" formControlName="absoluteTime">

我试过使用

<div [formGroup]="dueDateControl" class="row">
   <input class="form-control style__inputText style__inputText-forms duration" name='absoluteTime' [readonly]="context === 'details'" formControlName="absoluteTime" type="time" required> 
</div>

.ts 文件：

ngOnInit() {
   this.dueDateControl.addControl('absoluteTime', new FormControl('23:59', Validators.required));
}

什么都没有显示，我仍然得到 --:-- ！没有默认值！

Answer 1

请这样使用

<div [formGroup]="dueDateControl" class="row">
  <input class="form-control style__inputText style__inputText-forms duration" name='absoluteTime' formControlName="absoluteTime" type="time" required>
</div>

dueDateControl= this.formBuilder.group({
    absoluteTime: [''],
  });
  constructor(private formBuilder: FormBuilder) {}
  ngOnInit(): void {
    this.dueDateControl.get('absoluteTime')?.setValue('19:20')
  }

Answer 2

Ts File

  newDayDuration: 0;

<div class="col s4">
   <mat-form-field appearance="outline">
      <mat-label>{{ 'LABEL_DAYS_NEW' | translate: lang }}</mat-label>
      <input  (keypress)="numberOnly($event)"  placeholder="{{'LABEL_TOTAL_DAY_PLACEHOLDER' | translate:lang}}" [maxLength]="vendorRules.DAYS_ENTER_MAX_LENGTH"   matInput   [value]="newDayDuration"  [formControlName]="'newDayDuration'">
   </mat-form-field>
</div>

如何在formControl中设置默认值？

how to set default value in formControl?

form-control

angular

formgroups