FormArray TypeError: value.forEach is not a function

Question

为什么我总是收到这个错误？我觉得我做的一切都对吗？

"EXCEPTION: Uncaught (in promise): TypeError: value.forEach 不是函数 TypeError: value.forEach 不是 FormArray.setValue 处的函数"

组件 Class:

jobDetails: FormGroup;
techFormArray: FormArray;

constructor(private formBuilder: FormBuilder){

    this.techFormArray = new FormArray([
        new FormControl(''),
        new FormControl(''),
        new FormControl('')
    ]);
    this.jobDetails = this.formBuilder.group({
        techs: this.formBuilder.array([])
    });
    this.jobDetails.setValue({
        techs: this.techFormArray
    });
}

HTML:

<form [formGroup]="jobDetails">
  <div formArrayName="techs" >
    <div style="display: flex; flex-direction: column">
      <div *ngFor="let tech of techFormArray.controls; let i=index">
        <md-checkbox [formControlName]="i">
          {{i}}
        </md-checkbox>
      </div>
    </div>
  </div>
</form>

解决方案：

FunStuff 是对的，我不能使用 setValue....所以我删除了它。问题解决了哈哈。我改变了一些东西，我不确定我到底做了什么，这基本上是几个小时的暴力试验和错误，但后来它起作用了！ :)

这是工作版本！

jobDetails: FormGroup;

constructor(private formBuilder: FormBuilder){

    this.jobDetails = formBuilder.group({
        techs: formBuilder.array([
            formBuilder.control(''),
            formBuilder.control('')
        ])
    });
}

新 HTML:

    <form [formGroup]="jobDetails">
        <div formArrayName="techs" >
            <div style="display: flex; flex-direction: column">
                <div *ngFor="let tech of jobDetails.controls.techs.controls; let i=index">
                    <md-checkbox [formControlName]="i">
                        {{i}}
                    </md-checkbox>
                </div>
            </div>
        </div>
    </form>

Answer 1

setValue 方法采用简单值：

   this.techFormArray = new FormArray([
        new FormControl(''),
        new FormControl(''),
        new FormControl('')
    ]);

    this.jobDetails = this.formBuilder.group({
        techs: this.techFormArray
    });

    this.jobDetails.setValue({
      techs: ['a', 'b', 'c']
    });

Answer 2

因为您是在构造函数中执行此操作。否则你需要考虑清空 FormArray。

this.techFormArray.forEach((item, idx) => this.jobDetails.get('techs').setControl(idx, item));

FormArray TypeError: value.forEach is not a function

FormArray TypeError: value.forEach is not a function

formbuilder

angular