flex学习记录——Alert提示框使用

     Alert 控件是一个弹出对话框，可能包含消息、标题、按钮（“确定”、“取消”、“是”和“否”的任意组合）和图标。Alert控件是模式控件，这意味着在用户将其关闭之前，它将一直保留焦点。

将 mx.controls.Alert 类导入应用程序，然后调用 ActionScript 中的静态 show() 方法以显示 Alert 控件。

       属性：

     cancelLabel : String

     noLabel : String

     okLabel : String

     yesLabel : String

     text : String= ""  要在此警告对话框中显示的文本。

使用实例：

<?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", 3, this, 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>