一、在JavaScript中調用Flex方法
在Flex中可以用ExternalInterface來調用Flex的方法,途徑是
1.通過在Flex應用可調用方法列表中添加指定的公用方法。在Flex應用中通過調用addCallback()可以把一個方法添加到此列表中。addCallback將一個ActionScript的方法註冊爲一個JavaScript和VBScript可以調用的方法。
addCallback()函數的定義如下:
addCallback(function_name:String, closure:Function):void
function_name參數就是在Html頁面中腳本調用的方法名。closure參數是要調用的本地方法,這個參數可以是一個方法也可以是對象實例。
舉個例子:
<mx:Script>
import flash.external.*;
public function myFunc():Number {
return 42;
}
public function initApp():void {
ExternalInterface.addCallback("myFlexFunction",myFunc);
}
</mx:Script>
2.那麼在Html頁面中,先獲得SWF對象的引用,也就是用<object .../>聲明的Swf的Id屬性,比如說是MyFlexApp。然後就可以用以下方式調用Flex中的方法。
<SCRIPT language='JavaScript' charset='utf-8'>
function callApp() {
var x = MyFlexApp.myFlexFunction();
alert(x);
}
</SCRIPT>
<button οnclick="callApp()">Call App</button>
二、在Flex中調用 JavaScript
你 可以調用Html頁面中的JavaScript,通過與JavaScript的交互,可以改變Style,調用遠程方法。還可以將數據傳遞給Html頁 面,處理後再返回給Flex,完成這樣的功能主要有兩種方法:ExternalInterface()和navigateToUrl()。
在Flex中調用JavaScript最簡單的方法是使用ExternalInterface(),可以使用此API調用任意JavaScript,傳遞參數,獲得返回值,如果調用失敗,Flex拋出一個異常。
ExternalInterface封裝了對瀏覽器支持的檢查,可以用available屬性來查看。
ExternalInterface的使用非常簡單,語法如下:
flash.external.ExternalInterface.call(function_name: String[, arg1, ...]):Object;
參數function_name是要調用的JavaScript的函數名,後面的參數是JavaScript需要的參數。
舉個例子說明如何調用JavaScript函數
Flex應用中,添加如下方法:
<mx:Script>
<?xml version="1.0" encoding="iso-8859-1"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
<mx:Script>
import flash.external.*;
public function callWrapper():void {
var f:String = "changeDocumentTitle";
var m:String = ExternalInterface.call(f,"New Title");
trace(m);
}
</mx:Script>
<mx:Button label="Change Document Title" click="callWrapper()"/>
</mx:Application>
Html頁面中有如下函數定義:
<SCRIPT LANGUAGE="JavaScript">
function changeDocumentTitle(a) {
window.document.title=a;
return "successful";
}
</SCRIPT>
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評論:該方法是對滴,但在實際應用中好像有點問題,後來我使用了之官網提供的一段代碼
以下示例演示了在 Flash Player 與 HTML 容器之間發送數據的過程。
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); } } } }
<!-- saved from url=(0014)about:internet --> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>ExternalInterfaceExample</title> <script language="JavaScript"> var jsReady = false; function isReady() { return jsReady; } function pageInit() { jsReady = true; document.forms["form1"].output.value += "/n" + "JavaScript is ready./n"; } function thisMovie(movieName) { if (navigator.appName.indexOf("Microsoft") != -1) { return window[movieName]; } else { return document[movieName]; } } function sendToActionScript(value) { thisMovie("ExternalInterfaceExample").sendToActionScript(value); } function sendToJavaScript(value) { document.forms["form1"].output.value += "ActionScript says: " + value + "/n"; } </script> </head> <body οnlοad="pageInit();"> <object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" id="ExternalInterfaceExample" width="500" height="375" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab"> <param name="movie" value="ExternalInterfaceExample.swf" /> <param name="quality" value="high" /> <param name="bgcolor" value="#869ca7" /> <param name="allowScriptAccess" value="sameDomain" /> <embed src="ExternalInterfaceExample.swf" quality="high" bgcolor="#869ca7" width="500" height="375" name="ExternalInterfaceExample" align="middle" play="true" loop="false" quality="high" allowScriptAccess="sameDomain" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer"> </embed> </object> <form name="form1" οnsubmit="return false;"> <input type="text" name="input" value="" /> <input type="button" value="Send" οnclick="sendToActionScript(this.form.input.value);" /><br /> <textarea cols="60" rows="20" name="output" readonly="true">Initializing...</textarea> </form> </body> </html>