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    <p>I pretty sure there is a security "feature" in IE that stops JS being called too many times from Flash, to stop it crashing the browser.</p> <p>Is there a reason why you have to call it every frame? </p> <p>I'd suggest against this at all costs as it's putting a LOT of extra stress on the browser.</p> <p>***** EDIT *****</p> <p>If you want to call an ExternalInterface method from JS -> Flash in IE you have to reference the object slightly differently, like this:</p> <pre><code>function thisMovie(movieName) { if (navigator.appName.indexOf("Microsoft") != -1) { return window[movieName]; } else { return document[movieName]; } } </code></pre> <p>Then once you're sure the string you want to pass is constructed correctly you can call it like this from the JS:</p> <pre><code>thisMovie( "theFlashElementID" ).giveMeMyStringAlready(); </code></pre> <p>Then in your Flash you would have something like this:</p> <pre><code>if( ExternalInterface.available ) { ExternalInterface.addCallback( "giveMeMyStringAlready", handleTheStringFromJS ); } else { handleTheFactIDontHaveExternalInterfaceAvailable(); // the only reason this would be is if container that // is embedding the swf isn't fully loaded by the browser } </code></pre> <p>The standout line from the <a href="http://help.adobe.com/en_US/AS3LCR/Flash_10.0/flash/external/ExternalInterface.html" rel="nofollow noreferrer">AS3 docs</a> regarding ExternalInterface is this: </p> <blockquote> <p>Note: When using the External API with HTML, always check that the HTML has finished loading before you attempt to call any JavaScript methods.</p> </blockquote>
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    1. POFlash and JavaScript communication within IE
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    1. COI have had timing issues in the past in relation to load orders and the availiablity of java, and the readiness of the string I want to pass, so firing the script on an ENTERFRAME event seemed logical. Would a timer event seem more reasonable in that case (1 sec intervals)? The event is removed once the string is successfully read, not for the life of the swf in the browser. If I include an alert in the Javascript, I get spammed with the alert box, @ the framerate and need to end the browser from the task manager, so I'm not sure if that's it either.
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    2. COIf you're having timing issues, it might be better to have Flash listen for call from JS instead of Flash calling a method on JS so often, after all ExternalInterface is bi-directional :-) Flash -> JS every frame/every second - bad idea JS -> Flash when the data is ready - better idea On a recent project we had a big Flash header that did an initial load, then some jQuery waited for the rest of the page to fully load before calling a method to load the rest of it's assets. Also edited my answer above for more clarity to my points above
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