当ng-model在 Controller 中初始化时，Angularjs select ng-change不会被触发

Question

我的选择是这样的

<select ng-model="id_select" ng-options="fide.id as fide.name for fide in fides" ng-change="loadInfo()">
   <option value="" selected disabled>Seleccionar</option>
</select>

在我的 Controller 中我有这个

RestService.getFides().then(function(fides){

   $scope.id_select = fides;
   if(typeof $rootScope.selected_id !== 'undefined')
   {
      $scope.id_select = $rootScope.selected_id
   }
});

$scope.loadInfo = function() {
  alert("triggered!!");
}

我的选择正在按 fides 的预期加载，但是当我尝试使用 $rootScope 的值 ng-change 函数 loadInfo() 设置我的选择值时，不会触发，但当我在 View 中选择时，它工作正常。

我做错了什么有什么想法吗？

提前感谢大家的帮助:)

Answer 1

来自documentation for ngChange :

Evaluate the given expression when the user changes the input. The expression is evaluated immediately, unlike the JavaScript onchange event which only triggers at the end of a change (usually, when the user leaves the form element or presses the return key). The expression is not evaluated when the value change is coming from the model.

如果您要以编程方式更改模型，则需要手动调用事件处理程序:

if (typeof $rootScope.selected_id !== 'undefined') {
  $scope.id_select = $rootScope.selected_id;
  $scope.loadInfo();
}