如何显示在角2

-1

在危险的错误消息已经创建形式FIRST_NAME和另外姓氏.. 是否有角2任何一般形式的验证，也是我表现出在客户端的错误消息。如何显示危险！如何显示在角2

贝娄是我的代码

HTML文件

<form [formGroup]="myForm" (ngSubmit)="submit()" > 

<ion-item> 
    <ion-label primary floating>FIRST NAME</ion-label> 
    <ion-input type="text" id="firstname" class="form-control" formControlName="firstname" minlength="4" maxlength="12" required ></ion-input> 
</ion-item> 
    <p *ngIf="myForm.controls.firstname.errors && myForm.controls.firstname.dirty " danger > FirstName is required (b/w 4-12 chars)</p> 
<ion-item> 
    <ion-label primary floating>LAST NAME</ion-label> 
    <ion-input type="text" id="lastname" class="form-control" formControlName="lastname" minlength="4" maxlength="10" required ></ion-input> 
</ion-item> 
    <p *ngIf="myForm.controls.lastname.errors && myForm.controls.lastname.dirty " danger> LastName is required (b/w 1-10 chars)</p> 
</form>

告诉我如何显示错误信息处于危险之中！

来源

2016-12-14 SelvaKumar Duraisamy

这是离子的应用程序？ –

是离子型应用！ –

https://angular.io/docs/ts/latest/cookbook/form-validation.html#!#sts=Reactive%20Forms –

 <form role="form" name="myForm" novalidate=""> 
     <div data-ng-show="myForm.controls.firstname.errors && myForm.controls.firstname.dirty" class="alert alert-danger alert- dismissible" role="alert"> 
       <strong>FirstName is required (b/w 4-12 chars)</strong> 
      </div> 

      <div data-ng-show="myForm.controls.lastname.errors && myForm.controls.lastname.dirty" class="alert alert-danger alert-dismissible" role="alert"> 
       <strong>LastName is required (b/w 1-10 chars)</strong> 
      </div> 
    </form>

来源

2016-12-14 09:45:54

有人说用“myForm.get。（‘姓’）”我没有做什么它是 –

如何显示在角2

回答

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