Problems with ExternalInterface

Question

I am trying to have a Flex2 TitleWindow communicate with
Javascript and then have that Javascript communicate back with the
ActionScript in the TitleWindow.
Calling Javascript from ActionScript is working perfectly,
however, I have not yet been able to successfully call an
ActionScript method from Javascript.
My setup is fairly involved, but here are the basic
components. I would be happy to provide any additional information
that could help.
I have a creationComplete event in my TitleWindow which calls
an initialization function that registered callbacks and then a
callback function defined in the same TitleWindow.
public function init():void {
if (ExternalInterface.available){
ExternalInterface.addCallback("testCallback", testCallback);
Alert.show("Callbacks are registered");
else{
Alert.show("ExternalInterface was not available");
public function testCallback():void {
Alert.show("Received callback from Javascript");
Then when the user clicks a button on the TitleWindow, I do
the following:
ExternalInterface.call("jsFunction", "foo", "bar");
In my Javascript, I have the following:
var jsFunction = function(string1, string2){
alert("Received: " + string1 + ", " + string2);
flexObject.testCallback();
In my Html, I have the following to imbed flex
<object id='flexObject' codebase='
http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,0,0'
height='100%' width='100%'>
<param name='src' value='flexapp.swf'/>
<param name="allowScriptAccess" value="always"/>
<embed name='flexObject' src='flexapp.swf'
allowScriptAccess='always' pluginspage='
http://www.macromedia.com/shockwave/download/index.cgi?P1_Prod_Version=ShockwaveFlash'
height='100%' width='100%'/>
</object>
Now, I can load the html page just fine and everything look
great and is functional. When I go to the TitleWindow in question
and click the button that calls the Javascript, it works perfectly
and I see the Javascript alert box displaying "Receiving: foo,
bar". However, I never get any response from the ActionScript
callback that should be called at that point by the Javascript.
Looking at it more closely, I have been able to determine
that flexObject.testCallback is undefined at the point I try to
call it in my Javascript. Javascript is unable to see that this
method exists. If I try to use Firebug to trace the Javascript side
of things, it crashes at the flexObject.testCallback line.
I have tried doing:
flexObject.testCallback();
document.getElementById("flexObject").testCallback();
testCallback();
None of them work. Has anyone had luck with this? I have
tried it with FireFox 2 and IE 6 with the same result.

Answer 1

Never mind, it was some crazy-*** unrelated problem where JavaScript working in IE didn't work in FF.