angular 2删除formarray中的所有项目

我在formbuilder中有一个表单数组,我正在动态更改表单,即从应用程序1等单击加载数据.

我遇到的问题是所有数据都加载但是formarray中的数据保持不变,只是用旧的方式将旧项目连接起来.

如何清除formarray只有新项目.

我试过这个

const control2 = this.registerForm.controls['other_Partners'];
        control2.setValue([]);

但它不起作用.

有任何想法吗？谢谢

在nginit

ngOnInit(): void {
this.route.params.subscribe(params => { alert(params['id']);
            if (params['id']) {
                this.id = Number.parseInt(params['id']);
            }
            else { this.id = null;}
          });
if (this.id != null && this.id != NaN) {
            alert(this.id);
            this.editApplication();
            this.getApplication(this.id);
        }
        else
        {
            this.newApplication();
        }

}

onSelect(Editedapplication: Application) {
 this.router.navigate(['/apply', Editedapplication.id]);
}

editApplication() {
      
        this.registerForm = this.formBuilder.group({
              id: null,
            type_of_proposal: ['', Validators.required],
            title: ['', [Validators.required, Validators.minLength(5)]],
            lead_teaching_fellow: ['', [Validators.required, Validators.minLength(5)]],
            description: ['', [Validators.required, Validators.minLength(5)]],
            status: '',
            userID: JSON.parse(localStorage.getItem('currentUser')).username,
            contactEmail: JSON.parse(localStorage.getItem('currentUser')).email,
            forename: JSON.parse(localStorage.getItem('currentUser')).firstname,
            surname: JSON.parse(localStorage.getItem('currentUser')).surname,
            line_manager_discussion: true,
            document_url: '',
            keywords: ['', [Validators.required, Validators.minLength(5)]],
            financial_Details: this.formBuilder.group({
                  id: null,
                buying_expertise_description: ['', [Validators.required, Validators.minLength(2)]],
                buying_expertise_cost: ['', [Validators.required]],
                buying_out_teaching_fellow_cost: ['', [Validators.required]],
                buying_out_teaching_fellow_desc: ['', [Validators.required, Validators.minLength(2)]],
                travel_desc: ['', [Validators.required, Validators.minLength(2)]],
                travel_cost: ['', [Validators.required]],
                conference_details_desc: ['', [Validators.required, Validators.minLength(2)]],
                conference_details_cost: ['', [Validators.required]],
            }),

            partners: this.formBuilder.array
                (
                [
                    //this.initEditPartner(),
                    //this.initEditPartner()
                    // this.initMultiplePartners(1)
                ]
                ),
            other_Partners: this.formBuilder.array([
                //this.initEditOther_Partners(),
            ])
           
        });
       
    }

getApplication(id)
    {
        

        this.applicationService.getAppById(id, JSON.parse(localStorage.getItem('currentUser')).username)
            .subscribe(Response => {
               
                    if (Response.json() == false) {
                        this.router.navigateByUrl('/');
                    }
                    else {
                        this.application = Response.json();  
                          for (var i = 0; i < this.application.partners.length;i++)
                          {
                                this.addPartner();
                          }
                          for (var i = 0; i < this.application.other_Partners.length; i++) {
                              this.addOther_Partner();
                          }

                          this.getDisabledStatus(Response.json().status);
                        (this.registerForm)
                            .setValue(Response.json(), { onlySelf: true }); 
                      }

                }
         
        );

       
        
        

       
    }

clearFormArray = (formArray: FormArray) => {
  while (formArray.length !== 0) {
    formArray.removeAt(0)
  }
}

clearFormArray = (formArray: FormArray) => {
  formArray = this.formBuilder.array([]);
}

this.myForm= {
     name: new FormControl(""),
     desc: new FormControl(""),
     arr: new FormArray([])
}

const arr = this.myForm.controls.arr;
arr.push(new FormControl("X"));

const arr = this.myForm.controls.arr;
arr.controls = [];

arr.removeAt(0)

get inFormArray(): FormArray {
    this.myForm.get('inFormArray') as FormArray;
}

other tags...

inFormArray.reset();

inFormArray.push(new FormGroup({}));

inFormArray.removeAt(1);

const arr = new FormArray([
   new FormControl(),
   new FormControl()
]);
console.log(arr.length);  // 2

arr.clear();
console.log(arr.length);  // 0

while (arr.length) {
   arr.removeAt(0);
}

purgeForm(form: FormArray) {
  while (0 !== form.length) {
    form.removeAt(0);
  }
}

  while (formArray.length !== 0) {
    formArray.removeAt(0)
  }