Flex:将参数发送到Alert closeHandler

Question

是否可以将参数发送到closeHandler Alert功能？函数获取的fisrt参数是CloseEvent,但如何发送另一个？

<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);"/>

谢谢!

Answer 1

一种方法可能是在警报创建的范围内创建closeHandler.

这是一个例子:

<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);
}

Answer 2

这应该可以使用Flex的动态功能构造.这里也提出了类似的问题.

这是一个例子:

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));}
}

你的组件:

<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);"/>

Answer 3

处理此用例的典型方法是将数据添加到Alert表单中.例如

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Alert的关闭处理程序中

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