Angular2:属性"controls"在类型"AbstractControl"上不存在.通过索引访问formarray中的对象的.control时出错

问题描述

我正在尝试在formarray中推送另一个formbuilder，但是它给了我一个错误，因为我认为初始化代码时数组中没有项目，因此没有控件.错误是

I'm trying to push another formbuilder within a formarray but it gives me an error since I think there are no items in the array when initializing the code, hence there are no controls. The error is Property 'controls' does not exist on type 'AbstractControl' after the

(<FormArray>this.loanTypeForm.controls['frequency']).controls[index]

我正在使用角度2.0.0-beta.17

I'm using angular 2.0.0-beta.17

let settingsForm: FormArray = new FormArray([]);
      (<FormArray>this.loanTypeForm.controls['frequency']).push(
        this.formBuilder.group({
          'name': [value, Validators.required],
          'settings': settingsForm,
        })
      );
(<FormArray>this.loanTypeForm.controls['frequency']).controls[index].controls['settings'].push(
      this.formBuilder.group({
        'term': [null, Validators.required],
        'eir': [null, Validators.required],
      })
    );

推荐答案

您可以使用['controls']代替.controls，如下所示:

You can use ['controls'] instead of .controls, as below:

(<FormArray>this.loanTypeForm.controls['frequency']).controls[index]['controls']['settings'].push(...)

但是为了简化并提供更高的可读性，建议您将其全部更改为:

But in order to simplify and provide more readability I'd suggest you to change it all to:

const control = this.loanTypeForm.get(`frequency.${index}.settings`) as FormArray;
control.push(...);

这篇关于Angular2:属性"controls"在类型"AbstractControl"上不存在.通过索引访问formarray中的对象的.control时出错的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！