没有可用选项时如何提醒用户angularjs下拉菜单

<select ng-model="selectedOption" ng-disabled="options.length === 0">
  <option ng-repeat="option in options" value="{{option.value}}">{{option.label}}</option>
</select>

<select ng-model="selectedOption">
  <option value="" ng-if="options.length === 0">没有可用选项</option>
  <option ng-repeat="option in options" value="{{option.value}}">{{option.label}}</option>
</select>

<select ng-model="selectedOption" ng-show="options.length > 0">
  <option ng-repeat="option in options" value="{{option.value}}">{{option.label}}</option>
</select>
<p ng-hide="options.length > 0">没有可用选项</p>