我有一个问题时，当模型编程改变角度的NG-改叫。

I have a problem when angular's ng-change is called when model is changed programmatically.

$scope.sendMessage = function() {
    $scope.message = "Message sent";
}

$scope.confirmed = true;
$scope.mySelectBox = $scope.selects[1];

<select ng-model="mySelectBox"
        ng-options="item.name for item in selects track by item.name"
        ng-change="sendMessage()">
</select>

下面是code例如： http://plnkr.co/edit / R4MO86ihMrauHXhpCMxi？p = preVIEW

Here is code example: http://plnkr.co/edit/R4MO86ihMrauHXhpCMxi?p=preview

信息应该是空的，因为的sendMessage 不应该被调用。模型以编程方式改变了。

Message should be null, because sendMessage shouldn't be called. Model is changed programmatically.

推荐答案

据文档，你是对的。

https://docs.angularjs.org/api/ng/directive/ngChange

但是这似乎是一个错误所造成的，其中事件挂钩的顺序

but this seems to be a bug caused by the order in which the events are hooked up

绕着它的最好办法 - 用诉诸JS处理程序（的onchange）

The best way round it - with resorting to js handler (onchange)

$scope.$watch("mySelectBox", function(a,b) {
    if (a.name!=b.name) {
       $scope.message = "Message sent! (old="+b.name+', new='+a.name+')';
    }
  });

请参阅普拉克 http://plnkr.co/edit/2ZbxS1tszppR9SrNqxVB?p=$p$pview

心连心