错误：“formControlName 必须与父 formGroup 指令一起使用。” 为了<input ngbDatepicker #e="ngbDatepicker" (click)="e.toggle()">

Question

我有一个日期选择器，输入字段和弹出窗口配置如下：https ://ng-bootstrap.github.io/#/components/datepicker/overview

所以我有

1) 标记在模板中完成的所有需要​​的导入：

<input id="field_completed" [(ngModel)]="endDate" type="text" class="form-control" name="completed" formControlName="completed" placeholder="YYYY-MM-DD" ngbDatepicker #ended="ngbDatepicker" (click)="ended.toggle()" (dateSelect)="addEndDateAutomatically()"/>

2）有处理函数，它从NgbDateStruct的模型中NgbDateStruct endDate 值，获取它的日/月/年并将其放入我的 DTO 以发送到服务器

我无法理解，为什么只有在模板中使用了ngbDatepicker时才会出现以下错误，而在排除它ngbDatepicker不会：

main.99b988e9722c4de65a1a.bundle.js:1 ERROR Error: formControlName must be used with a parent formGroup directive.  You'll want to add a formGroup
       directive and pass it an existing FormGroup instance (you can create one in your class).

      Example:


    <div [formGroup]="myGroup">
      <input formControlName="firstName">
    </div>

    In your class:

    this.myGroup = new FormGroup({
       firstName: new FormControl()
    });
    at Function.l.controlParentException (main.99b988e9722c4de65a1a.bundle.js:1)
    at n._checkParentType (main.99b988e9722c4de65a1a.bundle.js:1)
    at n._setUpControl (main.99b988e9722c4de65a1a.bundle.js:1)
    at n.ngOnChanges (main.99b988e9722c4de65a1a.bundle.js:1)
    at main.99b988e9722c4de65a1a.bundle.js:1
    at main.99b988e9722c4de65a1a.bundle.js:1
    at Aw (main.99b988e9722c4de65a1a.bundle.js:1)
    at sx (main.99b988e9722c4de65a1a.bundle.js:1)
    at Object.updateDirectives (main.99b988e9722c4de65a1a.bundle.js:1)
    at Object.updateDirectives (main.99b988e9722c4de65a1a.bundle

Answer 1

它不再被复制，因为我已经从那里删除了 formControlName="completed" 并且只剩下 [(ngModel)]