How to access Actionscript from Javascript in Adobe AIR

Question

I have an AIR application written in html/javascript and I want to use the Actionscript print functions but I have no experience in Actionscript for AIR.

Where do I put the Actionscript code ? Does it go into an mxml file or does it need to be compiled into a Flash application. Where do I put it and how do I include it into the html document ? Finally, how do I call the AS function from Javascript ?

=====update=====

I know I have to compile either an .mxml or .as file into .swf using mxmlc and I have the following in my .as file:

package {
    import mx.controls.Alert;
    public class HelloWorld {
        public function HelloWorld():void {
            trace("Hello, world!");
        }
    }
}

Or alternately, this in a .mxml file:

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"&gt;
    <mx:Script>
    <![CDATA[
       import mx.controls.Alert;

           public function HelloWorld():void {
               Alert.show("hello world!");
               trace("Hello, world!");
           }
        ]]>
    </mx:Script>
</mx:Application>

This compiles OK, but when I include it in a html file with:

<script src="actionscript.swf" type="application/x-shockwave-flash"></script>

I get the following error:

TypeError: Error #1009: Cannot access a property or method of a null object reference. at mx.managers::FocusManager/activate() at mx.managers::SystemManager/activateForm() at mx.managers::SystemManager/activate() at mx.core::Application/initManagers() at mx.core::Application/initialize() at actionscript/initialize() at mx.managers::SystemManager/http://www.adobe.com/2006/flex/mx/internal::childAdded() at mx.managers::SystemManager/initializeTopLevelWindow() at mx.managers::SystemManager/http://www.adobe.com/2006/flex/mx/internal::docFrameHandler() at mx.managers::SystemManager/docFrameListener()

Any ideas what that means ?

Answer 1

You have to use air.trace where air is a predefined Javascript wrapper over utility AS packages.

I was assuming you were doing AIR development using HTML/AJAX.

However, otherwise, you need to use ExternalInterface to have the AS functions available to JS. Can you tell us why you need this?