如何验证和显示错误消息-Angular2材料设计? [英] How to Validate & Display Error Message - Angular2 Material Design?

问题描述

我有这个输入:

<form #f="ngForm" name="productForm">
     <md-input [(ngModel)]="product.price" name="price" required="true" placeholder="Price (USD)"></md-input>
     <div ng-messages="productForm.price.$error" role="alert">
         <div ng-message-exp="['required']">
              Price is required
          </div>
     </div>
</form>

但是没有显示价格必填信息.

But the message Price is required doesn't show up.

我应该如何正确设置错误消息的格式?

How should I properly format the error message?

当价格输入为空时，将显示ng-invalid类:

The ng-invalid class appears when the price input is empty:

当我填写内容时:

Angular在其中注入ng-valid类.

Angular injects ng-valid class in it.

我想要的样式类似于 angular1 md设计 :

I want is to have the style similar to angular1 md design that looks like this:

推荐答案

希望这是随着angular2-material的发展而添加的，但是目前模仿此方法的方法是设置dividerColor并使用MD-HINT指令.例如:

Hopefully this will be added as angular2-material evolves, but currently the way to mimic this is to set the dividerColor and use the MD-HINT directive. example:

<md-input placeholder="Email address"
    #email="ngModel"
    name="email"
    type="text"
    fullWidth={true}
    [(ngModel)]="model.email"
    required
    email
    dividerColor="{{ !email.valid ? 'warn' : 'primary' }}">
    <md-hint [hidden]="email.pristine || email.valid">
        <span [hidden]="email.errors?.required || !email.errors?.email">
            This doesn't appear to be a valid email address.
        </span>
        <span [hidden]="!email.errors?.required">Email address is required.</span>
    </md-hint>
</md-input>

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