Using ExternalInterface to send screen reader alerts

gistfile1.txt

ActionScript:

	import flash.external.*;

	public class MyButton extends Sprite() 
	{
		//Override the visible property to inform the screen reader when this object becomes visible
		override public function set visible(value : Boolean) : void 
		{
			super.visible = value;
			if(visible)
			{
				if(ExternalInterface.available)
        			{
	        			ExternalInterface.call(‘SendScreenReaderAlert’, “My Button is now visible”);
        			}	
			}
		}
	}

JavaScript:

   //Create a hidden aria alert
    function SendScreenReaderAlert(message) {
        $("<div role='alert' style='width: 1px; position: absolute; left: -2500px; overflow: hidden;'><p>" + message + "</p></div>)
            .appendTo($('body'));
    }