FLEX3 Alert.show()属性---flags用法补遗

FLEX3 Alert.show()属性---flags用法补遗???
由于翻查基本相关书籍以及Flex3官方文档均没有详细说明，所以这里记录一下，以作补遗。?

? Alert.show()里面有多个属性，其中排在第三是flags，这个属性作用是在弹出的Alert提示框里面显示那一个或多个按钮，文档和书籍一般只写该属性可以自由组合 Alert.OK,Alert.CANCEL,Alert.YES,Alert.NO四个选项，并用“|”分隔，其实也可以用数字编号代替的，用数字编号更为简便，以下是编号对应的按钮组合表，一共有16个数字编号（其实只有15种组合）。?
1-? Alert.YES?
2-? Alert.NO?
3-? Alert.YES | Alert.NO?
4-? Alert.OK?
5-? Alert.OK | Alert.YES?
6-? Alert.OK | Alert.NO?
7-? Alert.OK | Alert.YES | Alert.NO?
8-? Alert.CANCEL?
9-? Alert.YES | Alert.CANCEL?
10-? Alert.NO | Alert.CANCEL?
11-? Alert.YES | Alert.NO | Alert.CANCEL?
12-? Alert.OK | Alert.CANCEL?
13-? Alert.OK | Alert.YES | Alert.CANCEL?
14-? Alert.OK | Alert.NO | Alert.CANCEL?
15-? Alert.OK | Alert.YES | Alert.NO | Alert.CANCEL?
16-? Alert.OK （和4一样）?
17开始返回到1重新按顺序循环………..而flags属性不填写的话一般默认值为Alert.OK，也就是4或16。?

例子：?


//响应删除事件?
??? private function doDelete():void?
??? {?
??????? Alert.yesLabel="确定";?
??????? Alert.noLabel="取消";?
??????? Alert.show("是否确定删除选中记录？","删除记录",3,this,deleteCallBack);?
??? }?
??? //具体执行删除操作?
??? private function deleteCallBack(event:CloseEvent):void?
? {?
??? if(event.detail == Alert.YES)?
??? {?
????? Alert.okLabel="确定";?
????? Alert.show("删除成功！");?
??? }?
? }

=====================================================================================

? Alert.show()使用方式

<?xml version=”1.0″?>

<!– Simple example to demonstrate the Alert control. –>

<mx:Application xmlns:mx=”http://www.adobe.com/2006/mxml”>

?

????<mx:Script>

????????<![CDATA[

????????????import mx.controls.Alert;

????????????import mx.events.CloseEvent;

???????

????????????// Event handler function uses a static method to show

????????????// a pop-up window with the title,message,and requested buttons.???????

????????????private function clickHandler(event:Event):void {

????????????????Alert.show("Do you want to save your changes?","Save Changes",alertClickHandler);

????????????}

???????

????????????// Event handler function for displaying the selected Alert button.

????????????private function alertClickHandler(event:CloseEvent):void {

????????????????if (event.detail==Alert.YES)

????????????????????status.text="You answered Yes";

????????????????else

????????????????????status.text="You answered No";

????????????}

?

????????????// Event handler function changes the default Button labels and sets the

????????????// Button widths. If you later use an Alert with the default Buttons,

????????????// you must reset these values.

????????????private function secondClickHandler(event:Event):void {

????????????????Alert.buttonWidth = 100;

????????????????Alert.yesLabel = "Magenta";

????????????????Alert.noLabel = "Blue";

????????????????Alert.cancelLabel = "Green";

?

????????????????Alert.show("Select a color:","Color Selection",1|2|8,this);

???????????????

????????????????// Set the labels back to normal:

????????????????Alert.yesLabel = "Yes";

????????????????Alert.noLabel = "No";???????????????

????????????}

????????]]>

????</mx:Script>

?

????<mx:Panel title=”Alert Control Example” width=”75%” horizontalAlign=”center” paddingTop=”10″>

??????<mx:Text width=”100%” color=”blue” textAlign=”center”

??????????text=”Click the button below to display a simple Alert window.”/>

??????<mx:Button label=”Click Me” click=”Alert.show(‘Hello World!’,‘Message’);”/>

?

??????<mx:Text width=”100%” color=”blue” textAlign=”center”

??????????text=”Click the button below to display an Alert window and capture the button pressed by the user.”/>

??????<mx:Button label=”Click Me” click=”clickHandler(event);”/>

??????<mx:Label id=”status” fontWeight=”bold”/>

?

??????<mx:Text width=”100%” color=”blue” textAlign=”center”

??????????text=”Click the button below to display an Alert window that uses custom Button labels.”/>

??????<mx:Button label=”Click Me” click=”secondClickHandler(event);”/>

????</mx:Panel>

?

</mx:Application>

?

?

第一个alert

Alert.show(message,title);//?首参数为要弹出的对话框的内容，第二个参数为要弹出对话框的标题

?

?第二个Alert

Alert.show(“Do you want to save your changes?”,“Save Changes”,alertClickHandler);?首参数为要弹出的对话框的内容；第二个参数为要弹出对话框的标题；第三个参数指定可显示的button（可显示的button共四个分别为Alert.YES，Alert.NO，Alert.OK，Alert.CANCEL??他们的二进制值分别为1，2，4，8），也可以显示多个button，最多可显示四个，以安位或的型式相连：Alert.YES|Alert.NO |Alert.OK|Alert.CANCEL，或者取她们相或之后的二进制数，比如本例中取了Alert.YES与Alert.NO相或后的二进制数，?默认值为Alert.OK；第四个参数为Alert组件的父组件；第五个参数为button的单击响应事件或者称为Alert组件的关闭响应事件，默认值为null即无任何操作

第三个alert

Alert.show(“Select a color:”,”Color Selection”,this);可以更改Alert弹出对话框中button的label值，在alert组件中定义了每个button的label属性，例如：Alert.yesLabel，Alert.noLabel

，通过指定他们的值就可以更改对应button的label值，在本例中1|2|8指的是显示yes，no，cancel三个button

这三个Alert.show()是同一个方法，只是每个在用的时候省略了不同的参数，这个根据不同的需求来定