所以，我有我的 AIR 创建一个应用程序沙盒HTMLLoader对象，只是想打电话给从的 JavaScript的。在Flash中，这是通过可信赖的 ExternalInterface.addCallback（）函数来完成。然而，在空气，事情相当多的不同，我只是似乎无法得到它的工作。

So I have an Application Sandbox HTMLLoader object which I create in AIR and simply want to call ActionScript methods from JavaScript. In Flash, this is accomplished through our trusty ExternalInterface.addCallback() function. However in AIR, things are quite a bit different, and I just can't seem to get it to work.

下面是我的项目的简单介绍：

Here is a simplified overview of my project:

我的AIR（动作）主：

My AIR (ActionScript) main:

public class Main extends Sprite {

    public var _as3Var:String = "testing";
    public function as3Function():void
    {
        trace("as3Function called from Javascript");
    }

    public function Main() {
        NativeApplication.nativeApplication.addEventListener(InvokeEvent.INVOKE, onInvoke);
    }

    protected function onInvoke(e:InvokeEvent):void {
        NativeApplication.nativeApplication.removeEventListener(InvokeEvent.INVOKE, onInvoke );
        var app = new App();
        addChild(app);
        app.init(new ExternalContainer(), e.currentDirectory, e.arguments);
    }
}

和我这是怎么创建我的HTMLLoader对象：

And this is how I create my HTMLLoader object:

{
    _html = new HTMLLoader();
    _html.useCache = false;
    _html.runtimeApplicationDomain = ApplicationDomain.currentDomain;
    _html.load(new URLRequest("sandbox/AirRoot.html"));
    _html.width = 800;
    _html.height = 600;
    App.ref.addChild(_html);
}

而在去年，这里是我的JavaScript在我的 AirRoot.html 文件，该文件是试图调用公共方法 as3Function片段（）在我的主类中声明：

And at last, here is my snippet of JavaScript in my AirRoot.html file which is trying to call the public method as3Function() declared in my Main class:

Exposed.testAs3 = function()
{
    air.trace("Exposed.testAs3 called");            /* This works fine. */
    air.trace("runtimeVersion:");                   /* This works fine. */
    air.trace(air.NativeApplication.nativeApplication.runtimeVersion);  /* This works fine. */
    air.trace("seeing if I can get to AS3 params...");  /* This works fine. */

    /* This doesn't work - get the following error: TypeError: Value undefined does not allow function calls. */
    air.NativeApplication.nativeApplication.as3Function();
}

我在想什么？

What am I missing?

推荐答案

OK，我会回答我的问题。我保证这不是一个阴谋，以获得更多的声誉分，但我今天的严重混淆，但现在已经找到了合适的答案和文件 - 这通常是主要的问题很多工程师的问题...

OK, I am going to answer my own question. I promise this was not a ploy to gain more reputation points, but I was seriously confused today but have now found the appropriate answers and documentation - which is usually the main problem to many an engineer's question...

总之，答案：

在空气HTMLLoader对象包含一个神奇的属性， HTMLLoader.window ，这是对JavaScript的窗口对象的代理。因此，设置 HTMLLoader.window = AS3Function; 是单向的 - 或与pviously包括我的$ P $为例（假设我设置一个静态属性称为主要它指出，主类）：

The AIR HTMLLoader object contains a magical property, HTMLLoader.window, which is a proxy to the JavaScript window object. So setting HTMLLoader.window = AS3Function; is one way - or in relation to my previously included example (assuming I setup a static property called Main which pointed to the Main class):

_html.window.as3Function = Main.as3Function;

和现在的JavaScript我可以叫 as3Function 为：

And now in JavaScript I can just call as3Function as:

<script>
    window.as3Function();
</script>

另一个有趣的属性是JavaScript的window.htmlLoader对象。这是对AS3的HTMLLoader父对象的代理，在我的情况下，_html对象。从此，您可以访问有关从JavaScript的_html对象的事情。

Another interesting property is the JavaScript "window.htmlLoader" object. It is a proxy to the AS3 HTMLLoader parent object, in my case, the _html object. From this you can access things in relation to the _html object from JavaScript.