Question

为什么我一直收到此错误？我想我做的一切都好吗？

＆＃34; EXCEPTION：未捕获（承诺）：TypeError：value.forEach不是函数 TypeError：value.forEach不是FormArray.setValue中的函数＆＃34;

组件类：

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没错，我无法使用setValue ....所以我删除了它。问题解决了哈哈。我改变了一些事情，我不确定我做了什么，它基本上是蛮力的试验和错误几个小时，但后来它工作了！：）

这是工作版！

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

因为您正在构造函数中执行此操作。否则，您需要考虑清空FormArray。

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

FormArray TypeError：value.forEach不是函数

2 个答案: