[AS3]Flash Player 与 HTML 容器之间发送数据的过程

以下示例演示了在 Flash Player 与 HTML 容器之间发送数据的过程。

package { 
    import flash.display.Sprite; 
    import flash.events.*; 
    import flash.external.ExternalInterface; 
    import flash.text.TextField; 
    import flash.utils.Timer; 
    import flash.text.TextFieldType; 
    import flash.text.TextFieldAutoSize; 
 
    public class ExternalInterfaceExample extends Sprite { 
        private var input:TextField; 
        private var output:TextField; 
        private var sendBtn:Sprite; 
 
        public function ExternalInterfaceExample() { 
            input = new TextField(); 
            input.type = TextFieldType.INPUT; 
            input.background = true; 
            input.border = true; 
            input.width = 350; 
            input.height = 18; 
            addChild(input); 
 
            sendBtn = new Sprite(); 
            sendBtn.mouseEnabled = true; 
            sendBtn.x = input.width + 10; 
            sendBtn.graphics.beginFill(0xCCCCCC); 
            sendBtn.graphics.drawRoundRect(0, 0, 80, 18, 10, 10); 
            sendBtn.graphics.endFill(); 
            sendBtn.addEventListener(MouseEvent.CLICK, clickHandler); 
            addChild(sendBtn); 
 
            output = new TextField(); 
            output.y = 25; 
            output.width = 450; 
            output.height = 325; 
            output.multiline = true; 
            output.wordWrap = true; 
            output.border = true; 
            output.text = "Initializing...\n"; 
            addChild(output); 
 
            if (ExternalInterface.available) { 
                try { 
                    output.appendText("Adding callback...\n"); 
                    ExternalInterface.addCallback("sendToActionScript", receivedFromJavaScript); 
                    if (checkJavaScriptReady()) { 
                        output.appendText("JavaScript is ready.\n"); 
                    } else { 
                        output.appendText("JavaScript is not ready, creating timer.\n"); 
                        var readyTimer:Timer = new Timer(100, 0); 
                        readyTimer.addEventListener(TimerEvent.TIMER, timerHandler); 
                        readyTimer.start(); 
                    } 
                } catch (error:SecurityError) { 
                    output.appendText("A SecurityError occurred: " + error.message + "\n"); 
                } catch (error:Error) { 
                    output.appendText("An Error occurred: " + error.message + "\n"); 
                } 
            } else { 
                output.appendText("External interface is not available for this container."); 
            } 
        } 
        private function receivedFromJavaScript(value:String):void { 
            output.appendText("JavaScript says: " + value + "\n"); 
        } 
        private function checkJavaScriptReady():Boolean { 
            var isReady:Boolean = ExternalInterface.call("isReady"); 
            return isReady; 
        } 
        private function timerHandler(event:TimerEvent):void { 
            output.appendText("Checking JavaScript status...\n"); 
            var isReady:Boolean = checkJavaScriptReady(); 
            if (isReady) { 
                output.appendText("JavaScript is ready.\n"); 
                Timer(event.target).stop(); 
            } 
        } 
        private function clickHandler(event:MouseEvent):void { 
            if (ExternalInterface.available) { 
                ExternalInterface.call("sendToJavaScript", input.text); 
            } 
        } 
    } 
}