Apache flex Flex：将参数发送到警报closeHandler

是否可以向closeHandler警报函数发送参数？ 函数获取的第一个参数是CloseEvent，但是如何发送另一个参数呢

<s:Button id="btnLoadLocalData" label="Load data"
          click="Alert.show('Populate list with local data?', '', Alert.YES | Alert.CANCEL, this, loadLocalData(???parameters???), null, Alert.OK);"/>

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谢谢大家!

这应该可以使用Flex的动态函数构造。有人提出了类似的问题

下面是一个例子：

<s:Button id="btnLoadLocalData" label="Load data" click="btnLoadLocalData_clickHandler(event)"/>

function btnLoadLocalData_clickHandler(event:Event):void {
  var someVar:Object = someCalculation();
  var closeHandler:Function = function(closeEvent:CloseEvent):void {
    // someVar is available here
  };
  Alert.show('Populate list with local data?', '', Alert.YES | Alert.CANCEL, this, closeHandler, null, Alert.OK);
}

参数和处理程序：

var parameters:String = "Some parameter I want to pass";

private function loadLocalData(e:Event, parameter:String):void
{
  // voila, here's your parameter
}

private function addArguments(method:Function, additionalArguments:Array):Function 
{
  return function(event:Event):void {method.apply(null, [event].concat(additionalArguments));}
}

<s:Button id="btnLoadLocalData" label="Load data"
          click="Alert.show('Populate list with local data?', '', Alert.YES | Alert.CANCEL, this, addArguments(loadLocalData, [parameters])), null, Alert.OK);"/>

您的组件：

var parameters:String = "Some parameter I want to pass";

private function loadLocalData(e:Event, parameter:String):void
{
  // voila, here's your parameter
}

private function addArguments(method:Function, additionalArguments:Array):Function 
{
  return function(event:Event):void {method.apply(null, [event].concat(additionalArguments));}
}

<s:Button id="btnLoadLocalData" label="Load data"
          click="Alert.show('Populate list with local data?', '', Alert.YES | Alert.CANCEL, this, addArguments(loadLocalData, [parameters])), null, Alert.OK);"/>

---

一种方法可能是在警报创建范围内创建closeHandler

下面是一个例子：

<s:Button id="btnLoadLocalData" label="Load data" click="btnLoadLocalData_clickHandler(event)"/>

function btnLoadLocalData_clickHandler(event:Event):void {
  var someVar:Object = someCalculation();
  var closeHandler:Function = function(closeEvent:CloseEvent):void {
    // someVar is available here
  };
  Alert.show('Populate list with local data?', '', Alert.YES | Alert.CANCEL, this, closeHandler, null, Alert.OK);
}

函数btnLoadLocalData\u clickHandler（事件：事件）：无效{
var someVar:Object=someCalculation（）；
var closeHandler:Function=Function（closeEvent:closeEvent）：void{
//这里有someVar
};
Alert.show（'用本地数据填充列表？'，''，Alert.YES | Alert.CANCEL，this，closeHandler，null，Alert.OK）；
}

我处理此用例的典型方法是将数据添加到警报表单中。比如说

var o:Object = new Object();
o["stuff"] = "quick brown fox";

var alert:Alert = Alert.show("Message", "Title", mx.controls.Alert.YES | mx.controls.Alert.NO, null, OnAlertResult);
alert.data = o;

然后在警报的关闭处理程序中

private function OnAlertResult(event:CloseEvent):void {
    trace(event.target.data);
}

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我通常使用匿名函数包装带有参数的函数调用：

Alert.show("Are you sure?", Alert.YES | Alert.CANCEL, null, function(event:CloseEvent):void{doSomething(event.detail, param1, param2);}, null, Alert.CANCEL)

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正是我需要的！我希望尽可能减少处理程序函数的数量。非常感谢。非常棒的闭包和作用域的使用很好地实现了一个非常需要的技巧