angular - 错误类型错误 : Cannot read property 'invalid' of undefined angular 4

Question

我在 Angular 4 中收到以下错误:

ERROR TypeError: Cannot read property 'invalid' of undefined

代码如下:

<form name="form"  #f="ngForm" novalidate>

  <tr>
     <td width="10%" class="text-blue"></td> 
     <td><input type="text"  name="bankname" maxlength="25" appRestrictinput ="words" [(ngModel)]="model.bk_name" #bk_name="ngModel"  class="form-control" autofocus  /> </td>
  </tr>
  <div *ngIf="bankname.invalid && (bankname.dirty || bankname.touched)" class="alert alert-danger">
     <div *ngIf="bankname.errors.required">Name is required</div>
  </div>

</form>

请让我知道哪里出错了。提前致谢。

Answer 1

您在 View 中的控件引用是bk_name。将 bankname 替换为 bk_name。

<div *ngIf="bk_name.invalid && (bk_name.dirty || bk_name.touched)" class="alert alert-danger">
<div *ngIf="bk_name.errors.required">Name is required.</div>