如何捕获警报对话框选择？

Question

在事件处理程序中，我有一个Alert.show(...)提示用户进行确认。如何捕获警报提示的选择并在事件处理程序中使用它。例如：

private function mainEvtHandler(event:DynamicEvent):void { 
var alert:Alert = Alert.show("Are you sure?", "Confirmation", Alert.YES|Alert.NO, this, alertHandler); 
// How can I retrieve the selection and use it within this event handler? 
// i.e. if (alert == Alert.Yes) { ... 
var index:int = arrayColl.getItemIndex(event.data) 
... 
... 

Answer 1

你可以声明alertHandler为嵌套函数 ...

private function mainEvtHandler(event:DynamicEvent):void { 

    var alertResult: int = -1; 

    function alertHandler(evt:CloseEvent):void { 
    alertResult = evt.detail; 
    } 

    var alert:Alert = Alert.show("Are you sure?", "Confirmation", Alert.YES|Alert.NO, this, alertHandler); 
    if (alertResult == Alert.Yes) { 
    var index:int = arrayColl.getItemIndex(event.data); 
    ... 

} 

...或者你可以使用匿名函数

private function mainEvtHandler(event:DynamicEvent):void { 
    Alert.show("Are you sure?", "Confirmation", Alert.YES|Alert.NO, this, 
     function (nestedCloseEvent:CloseEvent):void { 
     if (nestedCloseEvent.detail == Alert.Yes) { 
      var index:int = arrayColl.getItemIndex(event.data); 
      ... 
     } 
     } 
); 
}