Angular7设置Input的disabled属性

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在html页面中直接按低版本的方式配置[attr.disabled]="true"，不生效，而且运行时按F12可以看到如下警告：

It looks like you're using the disabled attribute with a reactive form directive. If you set disabled to true when you set up this control in your component class, the disabled attribute will actually be set in the DOM for you. We recommend using this approach to avoid 'changed after checked' errors.

  Example:    form = new FormGroup({  first: new FormControl({value: 'Nancy', disabled: true}, Validators.required),
last: new FormControl('Drew', Validators.required)   });

 大概意思是在Form组件的ts文件中，构建FormGroup的时候，直接指定即可。代码调整如下：

@Component({
  selector: 'app-edituser',
  templateUrl: './edituserponent.html',
  styleUrls: ['./edituserponent.css']
})
export class EdituserComponent implements OnInit {

  validateForm: FormGroup;
  
  constructor(private modal: NzModalRef, private fb: FormBuilder) {
    //this.user = new User();
  }

  //主要修改ngOnInit方法中的this.fb.group函数的传参，UserId组件的disabled属性根据this.IdEditable变量动态计算
  ngOnInit() {
    console.log("[IdEditable] = " + this.IdEditable)
    this.validateForm = this.fb.group({
      UserId: new FormControl({value:this.uId, disabled: !this.IdEditable}, Validators.required),
      UserName: new FormControl({value:this.uName}, Validators.required)
    });    
  }

  @Input() uId: string;
  @Input() uName: string;

  IsConfirm: boolean;
  public IdEditable: boolean = true
  private opMode: string;

  public btnConfirmClick() {
    this.IsConfirm = true;
    this.modal.destroy({uId: this.uId, uName: this.uName, opMode: this.opMode});
    return false;
  }

  public btnCancelClick() {
    this.IsConfirm = false;
    this.modal.destroy({uId: '-2', uName: '', opMode: 'cancel'});
    return false;
  }

}

组件的html内容中，去除input元素的disabled属性：

<form name="form" nz-form [formGroup]="validateForm">
  <nz-form-item>
    <nz-form-label [nzSm]="6" [nzXs]="24" nzFor="txtUserId" nzRequired>用户ID</nz-form-label>
    <nz-form-control [nzSm]="14" [nzXs]="24">
      <input nz-input id="txtUserId" name="txtUserId" formControlName="UserId" [(ngModel)]="uId" placeholder="用户ID">
    </nz-form-control>
  </nz-form-item>
  <nz-form-item>
    <nz-form-label [nzSm]="6" [nzXs]="24" nzFor="txtUserName" nzRequired>用户姓名</nz-form-label>
    <nz-form-control [nzSm]="14" [nzXs]="24">
      <input nz-input id="txtUserId" formControlName="UserName" [(ngModel)]="uName" placeholder="用户ID">
      <nz-form-explain *ngIf="validateForm.get('UserName').dirty&&validateForm.get('UserName').hasError('required')">请输入用户姓名!</nz-form-explain>
    </nz-form-control>
  </nz-form-item>
  <hr/>
  <nz-form-item nz-row style="margin-bottom:8px;">
    <nz-form-control [nzSpan]="14" [nzOffset]="6" style="display: flex; justify-content: center;">
      <button nz-button nzType="primary" (click)="btnConfirmClick()" [disabled]="!validateForm.valid">确定</button>
      &nbsp;&nbsp;&nbsp;&nbsp;<button nz-button nzType="primary" (click)="btnCancelClick()">取消</button>
    </nz-form-control>
  </nz-form-item>
</form>

本文标签： 属性Inputdisabled