在角度应用程序中获取[Object Object]

时间:2018-06-06 06:05:36

标签: angular angular5 angular-forms angular-formbuilder

以角度形式获取 [对象] ,并且还将下拉列表(选择)设置为默认值0索引。在编辑的情况下一切正常。我是否需要为此创建页面初始化模型属性?

enter image description here

修改 ngModelChange 未调用 doNameChange 函数。

组件:

  export class User {
  Id: number;
  Name: string;
  Gender: string;    
}
this.user = {
      Id: 0,
      Name: '',
      Gender: ''
}
doNameChange(event) {
    debugger;
    console.log(event); // logs model value
  }

HTML

 <form (ngSubmit)="save(f.value, f.valid)" #f="ngForm" novalidate materialize>      
      <input id="Name" (ngModelChange)="doNameChange($event)" name="Name" #Name="ngModel" type="text" class="validate form-control" required minlength="3" [(ngModel)]="user.Name">
      <select id="Gender"  name="Gender" #Gender="ngModel" class="validate form-control" [(ngModel)]="user.Gender" required>
          <option value="">-- Select Gender --</option>
          <option value="Male">Male</option>
          <option value="Female">Female</option>
        </select>
    </form>

1 个答案:

答案 0 :(得分:1)

使用反应形式时,请勿使用适用于基于模板的表单的ngModel。 如果您需要听取更改:

ngÒnInit(){
   this.employeeForm = this._fb.group({
      EmployeeId: 0,
      Name: ['', [Validators.required, Validators.minLength(3)]],
      Gender: ['', [Validators.required]]  //dropdown
   });
   this.onChanges();
}
...

onChanges(): void {
  this.myForm.valueChanges.subscribe(val => {
        console.log(val);
  });
}

 //or:
onChanges(): void {
  this.myForm.get('name').valueChanges.subscribe(val => {
    console.log(val);
  });
}