javascript - AngularJS无法读取未定义的属性

我正在尝试获取日期值。每当未选中该复选框且日期选择器不可见时，我都会收到错误消息：“无法读取未定义的属性'NTLI'”。如果选中该复选框并且日期选择器可见，则一切正常

<md-checkbox ng-model="user.NTLI" layout="row" ng-disabled="userForm.$invalid">
  NTLI
</md-checkbox>
<div ng-show="user.NTLI">
<fieldset class="standard">
    <legend>NTLI</legend>
    <md-input-container>
        <label>Efective date</label>
        <md-datepicker ng-model="user.efectiveDateNTLI"></md-datepicker>
    </md-input-container>
</fieldset>
</div>

var efDate = '';
if ($scope.user.NTLI != undefined)
{
    efDate = $scope.user.efectiveDateNTLI
}

最佳答案

您需要由用户定义，

$scope.user ={};
if ($scope.user.NTLI != undefined)
{
    efDate = $scope.user.efectiveDateNTLI
}