如何从嵌套的 FormGroup 添加/删除 FormControl [英] How to add/remove FormControl from a nested FormGroup

问题描述

candidateForm:FormGroup; 
constructor(private fBuilder: FormBuilder){ }

ngOnInit(){
    this.candidateForm = this.fBuilder.group({
      fname: [null, [Validators.required]],
      lname: [null, [Validators.required]],
      address: this.fBuilder.group({
        address1: [null],
        address2: [null],
      })
    })
  }

如何将名为address3的FormControl添加到表单组address?同样如何从同一个 FormGroup 中删除它们?

How to add a FormControl named address3 to the form group address? And similarly how to remove them from the same FormGroup?

推荐答案

首先，您必须从主 FormGroup 中获取子 FormGroup，然后您可以使用此处文档中引用的 addControl 和 removeControl:https://angular.io/api/forms/FormGroup.

First you have to get the sub FormGroup from your main FormGroup, and then you could use the addControl and removeControl refrenced in the documentation here: https://angular.io/api/forms/FormGroup.

所以你的情况是:

//Add:
this.candidateForm.get('address').addControl('address3',[]);

//Remove:
this.candidateForm.get('address').removeControl('address2');

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