md-autocomplete在md-chips上的验证

Question

我正在尝试构建一个使用angular材质并使用md-chips和md-autocomplete等元素的页面。

我希望对此md-chips进行验证，以便在没有芯片并单击提交按钮时显示一条错误消息，这与md-input-container类似。

对于md-input-container，我的代码如下

<md-input-container class="md-block" flex-gt-sm>
      <label>Title</label>
      <input md-maxlength="100" maxlength="100" required type="text" name="bookTitle" ng-model="bookCtrl.book.name">

      <div ng-messages="bookForm.bookTitle.$error" role="alert">
        <div ng-message-exp="['required', 'maxlength']">
          Book title is required and it should not exceed 100 characters.
        </div>
      </div>
    </md-input-container>

如果未满足验证条件，则会出现警报。如何使用具有以下代码的md-autocomplete执行类似于md-chips的操作

<md-chips name="bookAuthors" ng-model="bookCtrl.book.authors" md-autocomplete-snap
              md-separator-keys="bookCtrl.keys"
              md-transform-chip="bookCtrl.transformChip($chip)"
              md-require-match="bookCtrl.authorAutocompleteRequireMatch">
      <md-autocomplete
        md-selected-item="bookCtrl.selectedAuthor"
        md-search-text="bookCtrl.searchAuthor"
        md-items="author in bookCtrl.querySearch(bookCtrl.searchAuthor, bookCtrl.bookAuthors)"
        md-item-text="author.name"
        placeholder="Author">
        <span md-highlight-text="bookCtrl.searchAuthor">{{author.name}}</span>
      </md-autocomplete>

      <md-chip-template>
        <span>{{$chip.name}}</span>
      </md-chip-template>
    </md-chips>

为了执行验证，可以向md-chips添加什么？

Answer 1

在md-chip块外创建div块，并添加红色。它的工作原理与此类似

<div ng-messages="{test:true}" ng-show="true">
    <div ng-message="test" style="color: rgb(221,44,0); font-size:12px">errroro123</div>
</div>