使用selectpicker-p

Question

我使用class =＆＃34; selectpicker-p＆＃34; 使用此类时，下拉列表不会重置

视图：

<div class="form-group dropdown-full-width">
    <label class="control-label col-sm-2" for="fullname">Emrgency:</label>
    <div class="col-sm-3">
        <select ng-model="urgency" ng-init="urgency='regular'" class="selectpicker-p" >
            <option  ng-repeat="urgencyItem in urgencyArray"  ng-init="urgency='regular'" value="{{urgencyItem.value}}" >{{urgencyItem.value}}</option>
        </select>
    </div>
</div>

<div class="form-group"> 
    <div class="col-sm-offset-2 col-sm-3">
        <button type="submit" class="btn btn-default" ng-click="asad()">save</button>
    </div>
</div>

控制器：

$scope.asad=function(){
    $scope.urgency='Regular'
}

如果我使用class =＆＃34; selectpicker-p＆＃34;在选择元素上，下拉列表不会重置， 否则，如果我删除它，下拉列表将重置并获得默认值

提前感谢您的帮助！