角度2:从FormArray访问数据 [英] Angular 2: Accessing data from FormArray

问题描述

我已经使用angular2/forms提供的ReactiveForms准备了一个.此表单具有表单数组产品:

I have prepared a from using ReactiveForms provided by angular2/forms. This form has a form array products:

this.checkoutFormGroup = this.fb.group({
            selectedNominee: ['', Validators.required],
            selectedBank: ['', Validators.required],
            products: productFormGroupArray
        });

productFormGroupArray是FormGroup对象的数组.我使用以下方法获取控件，即FormArray对象:

productFormGroupArray is a array of FormGroup Objects.I fetched the controls i.e. FormArray object using this:

this.checkoutFormGroup.get('products')

我正在尝试在商品数组中获取索引为 i 的元素.如何在不循环遍历数组的情况下完成此操作?

I am trying to get the element in the products array at index i. How can this be done without looping through the array?

我尝试了可用的at(index)方法:

I tried with at(index) method available:

this.checkoutFormGroup.get('products').at(index)

但这会产生如下错误:

Property 'at' does not exist on type 'AbstractControl'.

修改2:从服务器收到checkoutData和资金.

Edit 2: checkoutData and fund are received from server.

this.checkoutData.products.forEach(product => {
                    this.fundFormGroupArray.push(this.fb.group({
                        investmentAmount: [this.fund.minInvestment, Validators.required],
                        selectedSubOption: ['', Validators.required],
                    }))
            });

推荐答案

只需将该控件转换为数组

Just cast that control to array

var arrayControl = this.checkoutFormGroup.get('products') as FormArray;

它的所有功能都在那里

var item = arrayControl.at(index);

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