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您好，我正在使用 Angular 反应式表单，我使用 FormArray 动态添加表单控件。我正在使用 ngModel 指令将用户输入的数据存储在 components 变量中。但它没有将其存储在 components 变量中。我的代码是：

<form [formGroup]="reviewForm" (ngSubmit)="onSubmit()">
  <div class="example-label">
    <span class='block'>    
          <span *ngIf="selectedForm">
                  <h2 class="example-heading">{{displayForm}} </h2>
          </span>
    <div formArrayName="controlArray">
      <div *ngFor="let control of reviewForm.get('controlArray').controls; let i = index">
        <table>
          <tr>
            <td> <span *ngIf="control.value.controlType == 'text'">
          <md-form-field class="example-full-width">
            <input mdInput type="text" placeholder="{{control.value.placeholder}}" 
            ([ngModel])="control.value.value" > <!--user entered data is not storing in control.value.value -->
          </md-form-field>  
      </span></td>

          </tr>
        </table>
      </div>
      <button md-raised-button color="primary" type="submit" [disabled]="!reviewForm.valid">Submit</button>
    </div>
    </span>
  </div>
</form>

这是组件类代码：

export class FormListComponent {

  formsDb: FormData[];
  selectedForm: FormData;
  displayForm: String;
  test: String;
  reviewForm = new FormGroup({
    'controlArray': new FormArray([])
  });
  constructor(public formService: FormService, public authGuardService: AuthGuardService) {
    console.log('form-list is logged in 0528', this.authGuardService.authService.isLoggedIn);
  }

  ngOnInit() {
    this.reviewForm = new FormGroup({
      'controlArray': new FormArray([
      ])
    });
    this.showDefaultForm();
  }



  addForm() {
    this.displayForm = this.selectedForm.formName;
    this.reviewForm.setControl('controlArray', new FormArray([]));  //to reset FormArray               
    console.log('selected form 0528', this.selectedForm);
    for (let control of this.selectedForm.controlsArr) {
      const myControl: Control = new Control(control.controlType, control.label, control.required,
        control.placeholder, control.options);

      var controlArg: FormControl;
      if (control.required)
        controlArg = new FormControl(myControl, Validators.required);
      else
        controlArg = new FormControl(myControl);

      (<FormArray>this.reviewForm.get('controlArray')).push(controlArg);
    }
  }

  onSubmit() {
    console.log('submitted form 0528', this.reviewForm);
  }
}

这是我的 Control 类，我将它的对象传递给 FormControl 构造函数：

export class Control{  
    constructor(public controlType?:string, public label?:string, public required?:boolean ,public placeholder?:string, 
      public options?:string[], public value?:string){  }
  }

为了检查用户输入的数据是否存储在组件的变量中，我记录了我的 FormGroup 变量，即在这种情况下的 reviewForm。没有数据保存在其中。请帮忙，谢谢

4

1 回答 1

2

我建议不要ngModel以反应形式使用。使用表单控件代替您的反应式表单，因此删除value和[(ngModel)]. 这是您的代码的简化版本，供您参考。构建表单，如果您获得一些默认值，请迭代该数组并将表单组推送到您的 formArray：

constructor(private fb: FormBuilder) {
  this.reviewForm = fb.group({
    controlArray: fb.array([])
  })
  let controlArr = this.reviewForm.controls.controlArray as FormArray
  // arr contains your default values
  this.arr.forEach(x => {
    controlArr.push(fb.group({
      controlType: [x.controlType],
      value: [x.value]
    }))
  })
}

然后在您的模板中，切换到使用formControlName控件，并formGroupName为您的 FormArray 中的每个表单组添加：

<div formArrayName="controlArray">
  <!-- add formGroupName -->
  <div *ngFor="let control of reviewForm.get('controlArray').controls; 
               let i = index" 
               [formGroupName]="i">
    <table>
      <tr>
        <td> 
          <span *ngIf="control.value.controlType == 'text'">
            <div class="example-full-width">
              <input type="text" formControlName="value">
             </div>  
          </span>
        </td>
      </tr>
    </table>
  </div>
</div>

StackBlitz

于 2017-12-05T06:37:48.273 回答