How to detect for screenreaders/MSAA without focusing the flash movie?

Posted by utt73 on Stack Overflow See other posts from Stack Overflow or by utt73
Published on 2010-05-29T22:04:27Z Indexed on 2010/05/29 22:12 UTC
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I am trying to detect for the presence of assistive technology using flash. When a Flash movie holding the actionscript below on frame 1 is loaded (and screenreader chatting to IE or Firefox over MSAA is active -- JAWS or NVDA), Accessibility.isActive() does not return "true" until the movie is focused. Well, actually not until some "event" happens. The movie will just sit there until I right-click it & show flash player's context menu... it seems only then Accessibility.isActive() returns true. Right-clicking is the only way I could get the movie to "wake up".

How do I get the movie to react on it's own and detect MSAA? I've tried sending focus to it with Javascript... can a fake a right-click in javascript or actionscript? Or do you know the events a right click is firing in a flash movie -- possibly I can programatically make that event happen?

My Actionscript:

var x = 0;
//check if Microsoft Active Accessibility (MSAA) is active.
//Setting takes 1-2 seconds to detect -- hence the setTimeout loop.
function check508(){
if ( Accessibility.isActive() ) {
//remove this later... just visual for testing
logo.glogo.logotext.nextFrame();
//tell the page's javascript this is a 508 user
getURL("javascript:setAccessible();")
} else if (x<100) {
trace ("There is currently no active accessibility aid. Attempt " + x);
x++;
setTimeout(check508,200);
}
}
/*
//FYI: only checks if browser can talk to MSAA, not that it is actually running. Sigh.
if (System.capabilities.hasAccessibility) {
logo.glogo.logotext.nextFrame();
getURL("javascript:setAccessible();")
};
*/
check508();
stop();

My HTML:

<embed id="detector" width="220" height="100" quality="high" wmode="window" type="application/x-shockwave-flash" src="/images/detect.swf" pluginspage="http://www.adobe.com/go/getflashplayer" flashvars="">

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