angular - 如何在 ngFor 循环中动态定义 formControl 名称？

Question

我想根据对象中包含的项目动态填充字段。我正在使用带有 Angular Material 的 react 形式。

但是，我得到:

Error: Cannot find control with unspecified name attribute

<div *ngFor="let field of guidelines.fields; let i=index">
  <mat-form-field>
    <input [formControl]="i" ngDefaultControl matInput placeholder={{field.field_name}} value={{field.notes}}>
  </mat-form-field>
</div>

Answer 1

使用表单组:

HTML

<div [formGroup]="form" class="edit-guidelines">
  <div mat-dialog-content>
    <h2>Edit Guidelines</h2>
    <h3>{{guidelines.tab_name}}</h3>
    <div *ngFor="let field of guidelines.fields; let i=index">
      <mat-form-field>
        <input [formControlName]="field.field_name" ngDefaultControl matInput placeholder={{field.field_name}} value={{field.notes}}>
      </mat-form-field>
    </div>
  </div>
  <div mat-dialog-actions>
    <span class="right-align-next-element"></span>
    <button class="secondary-btn" mat-button (click)="closeModal()">Cancel</button>
    <button class="primary-btn" mat-button (click)="updateGuideline()" cdkFocusInitial>Update Manufacturer</button>
  </div>
</div>

TS

getGuideline() {
    this.guidelines = this.data.tabObj[0];
    console.log(this.guidelines);
    this.form = this.createGroup();
  }

  createGroup() {
    const group = this.fb.group({});
    this.guidelines.fields.forEach(control => group.addControl(control.field_name, this.fb.control('')));
    return group;
  }