Angular Forms 的问题：AbstractControl 与 FormControl

Question

当我尝试使用带有控件的表单时，出现此错误。

 Type 'AbstractControl' is missing the following properties from type 
'FormControl': registerOnChange, registerOnDisabledChange, _applyFormState

表格代码

  this.checkoutForm = this.fb.group({
      firstName: ['', [Validators.required, Validators.pattern('[a-zA-Z][a-zA-Z ]+[a-zA-Z]$')]],
      lastName: ['', [Validators.required, Validators.pattern('[a-zA-Z][a-zA-Z ]+[a-zA-Z]$')]],
      phoneNumber: ['', [Validators.required, Validators.pattern('[0-9]+')]],
      address: ['', [Validators.required, Validators.maxLength(100)]],
      pinCode: ['', Validators.required]
    });

html

<input type="text" 
name="firstName"
[formControl]="checkoutForm.controls['firstName']" 
value="" 
placeholder="" 
autocomplete="off"      
>

Answer 1

当您创建响应式表单时，您应该使用表单本身，而不是它的控件。

如果您只是单独使用控件，那么拥有表单的意义何在？

<form [formGroup]="checkoutForm">
  <input type="text" formControlName="firstName">
</form>