Run javascript inside HTML component in Adobe AIR Flex 4?

I have the following component in an AIR application from Flex 4:

<mx:HTML id="viewObject"
         x=开发者_开发百科"10" y="42" width="634" height="313"
         location="http;//localhost:8080/mypage.php" />

Now I want to run a javascript when the page loads but the javascript isn't inside the target page. I want to run the following javascript:

javascript:alert('Hello world.');

I tried approaching it by setting the location property again to the javascript after the page has loaded like below.

<s:Button x="10" y="10" label="Button">
    <s:click>
        <![CDATA[
        viewObject.location = "javascript:alert('hello world');";
        ]]>
    </s:click>
</s:Button>

Unfortunately for me, that doesn't seem to work. Can anybody help me out with this problem?

That's because location is like using the address bar. What you need to do is something like this:

htmlComponent.htmlLoader.window.alert('hello world');

I think that should work.