Angular 7: "未指定名称属性的控件无法找到"

Question

我正在创建我的第一个Angular应用程序，并在开发模式控制台中收到以下错误：

ERROR Error: “Cannot find control with unspecified name attribute” ERROR Error: “Cannot find control with path: ‘items -> name’” ERROR Error: “Cannot find control with path: ‘items -> height’”

我已经阅读了几篇SO答案（如this，this，this和this），但我无法确定我做错了什么，我的Angular经验也没有帮助。

这是我的组件typescript代码：

import {Component, OnInit} from '@angular/core';
import {FormArray, FormBuilder, FormControl, FormGroup, Validators} from '@angular/forms';

@Component({
  selector: 'app-pack-input',
  templateUrl: './pack-input.component.html',
  styleUrls: ['./pack-input.component.css']
})
export class PackInputComponent implements OnInit {
  public boxForm: FormGroup;

  constructor(private formBuilder: FormBuilder) {  }

  ngOnInit() {
    this.boxForm = this.formBuilder.group({
      items: this.formBuilder.array([this.createBox()])
    });
  }

  createBox(): FormGroup {
    return this.formBuilder.group({
      name: ['', [Validators.required, Validators.minLength(3)]],
      height: ['', [Validators.required, Validators.minLength(3)]],
      width: ['', [Validators.required, Validators.minLength(3)]],
      length: ['', [Validators.required, Validators.minLength(3)]],
      weight: ['', [Validators.required, Validators.minLength(3)]]
    });
  }

  get items(): FormArray {
    return this.boxForm.get('items') as FormArray;
  }

  addItem(): void {
    this.items.push(this.createBox());
  }

  public onSubmit(formValue: any) {
    console.log(formValue);
  }
}

这是我的HTML组件代码：

<div>
  <div class="row">
    <h3>Set the box size in meters</h3>
  </div>
  <form [formGroup]="boxForm" (ngSubmit)="onSubmit(boxForm.value)" >
    <div class="row" formArrayName="items" *ngFor="let item of items.controls; let i = index;" [formGroupName]="i" style="margin-bottom: 10px">
      <div class="form-group">
          <div class="col-sm-5 form-group">
            <label for="name">Name</label>
            <input class="form-control" type="text" formControlName="name" placeholder="Name" />
          </div>
          <div class="col-sm-3 form-group">
            <label for="name">Height</label>
            <input class="form-control" type="text" formControlName="height" placeholder="Height" />
          </div>
          <div class="col-sm-3 form-group">
            <label for="name">Width</label>
            <input class="form-control" type="text" formControlName="width" placeholder="Width" />
          </div>
          <div class="col-sm-3 form-group">
            <label for="name">Length</label>
            <input class="form-control" type="text" formControlName="length" placeholder="Length"/>
          </div>
          <div class="col-sm-3 form-group">
            <label for="name">Weight</label>
            <input class="form-control" type="text" formControlName="weight" placeholder="Weight" />
          </div>
        <hr>
      </div>
    </div>
    <button class="btn btn-success" type="submit"  style="margin-right: 10px">Pack</button>
    <button class="btn btn-primary" type="button" (click)="addItem()">New Box</button>
  </form>
</div>

我在typescript代码中的formControlName="name"和formControlName="height"中没有发现任何拼写错误。我完全迷失了方向。

我在这里做错了什么？

- dazito

Answer 1

您不应该在同一个元素上同时使用FormArrayName和FormGroupName：

<div class="row" formArrayName="items" *ngFor="let item of items.controls; let i = index;">
  <div class="form-group" [formGroupName]="i" >

Ng-run示例

- yurzui

---

谢谢你提醒我使用ng-run（干得好，伙计！） :) - AT82

谢谢，救了我一命：））我做了类似的事情，我的形式数组名称在父元素上，但是没想到直到看到这个解决方案。 - HDs Sergiu

Answer 2

尝试将您的formGroupName声明向下延伸一层，像这样：
请参考以下示例代码：

<div>
  <div class="row">
    <h3>Set the box size in meters</h3>
  </div>
  <form [formGroup]="boxForm" (ngSubmit)="onSubmit(boxForm.value)" >
    <div class="row" formArrayName="items" *ngFor="let item of items.controls; let i = index;" style="margin-bottom: 10px">
      <div class="form-group" [formGroupName]="i">
          <div class="col-sm-5 form-group">
            <label for="name">Name</label>
            <input class="form-control" type="text" formControlName="name" placeholder="Name" />
          </div>
          <div class="col-sm-3 form-group">
            <label for="name">Height</label>
            <input class="form-control" type="text" formControlName="height" placeholder="Height" />
          </div>
          <div class="col-sm-3 form-group">
            <label for="name">Width</label>
            <input class="form-control" type="text" formControlName="width" placeholder="Width" />
          </div>
          <div class="col-sm-3 form-group">
            <label for="name">Length</label>
            <input class="form-control" type="text" formControlName="length" placeholder="Length"/>
          </div>
          <div class="col-sm-3 form-group">
            <label for="name">Weight</label>
            <input class="form-control" type="text" formControlName="weight" placeholder="Weight" />
          </div>
        <hr>
      </div>
    </div>
    <button class="btn btn-success" type="submit"  style="margin-right: 10px">Pack</button>
    <button class="btn btn-primary" type="button" (click)="addItem()">New Box</button>
  </form>
</div>

- Linh