Question

CreateCollegeComponent.html：4错误错误：formGroup需要一个FormGroup实例。请传递一个。

示例：

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

在您的课堂上：

this.myGroup = new FormGroup({
   firstName: new FormControl()
});

at Function.push../node_modules/@angular/forms/fesm5/forms.js.ReactiveErrors.missingFormException (forms.js:1169)
at FormGroupDirective.push../node_modules/@angular/forms/fesm5/forms.js.FormGroupDirective._checkFormPresent (forms.js:4598)
at FormGroupDirective.push../node_modules/@angular/forms/fesm5/forms.js.FormGroupDirective.ngOnChanges (forms.js:4508)
at checkAndUpdateDirectiveInline (core.js:9239)
at checkAndUpdateNodeInline (core.js:10507)
at checkAndUpdateNode (core.js:10469)

Answer 1

当我在ngOnInit中定义表单时，我遇到了同样的问题。将其移至构造函数，问题便得到解决。

我正在尝试将数据发布到HTTP中，但是我收到formGroup期望的FormGroup实例错误

1 个答案: