如何从angular4的表单中删除formGroup？

Question

I am using template driven forms and i want to remove a formGroup from the form controls. how can i do that? i have following controls in my form

as you can see in this image, i have a set of formControls and a formGroup. I want to remove the formGroup, how can i do that?

i am able to remove the formControl inside the formGroup like this

const ymmtGroup = <FormGroup>this.form.controls['someGroup'];
ymmtGroup.removeControl('someControl');

but not know how to remove the formGroup itself UPDATE 1

i did something like this, just let me know if this is right var formControls=this.form.controls; delete formControls.someGroup;

Answer 1

In your example this.form is FormGroup by itsself. someGroup is just this.form 's control (each form group may have another form groups as its child controls). FormGroup has removeControl() function, which looks like:

  removeControl(name: string): void {
    if (this.controls[name]) this.controls[name]._registerOnCollectionChange(() => {});
    delete (this.controls[name]);
    this.updateValueAndValidity();
    this._onCollectionChange();
  }

and which you already used. So, just try:

this.form.removeControl('someGroup');

Answer 2

Try something like this:

Proper Way to remove a form Group

export class AppComponent  {
  myForm: FormGroup;

  constructor(private fb: FormBuilder){
    this.createForm();
    this.removeGroup();
    console.log(this.myForm.value)

  }

  createForm(){
    this.myForm = this.fb.group({
      parentGroup: this.fb.group({
        childGroup: this.fb.group({
          control1: null,
          control2:null,
          control3:null
        })
      })
    })
  }

  removeGroup(){
    this.myForm.removeControl('parentGroup');
    this.myForm.updateValueAndValidity();
  }
}