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copied!<p>I notice two things right away</p> <p>firstly it appears your ExternalInterface will die if the ExternalInterface is not ready.</p> <pre><code>public function initApp():void { if (ExternalInterface.available) { ExternalInterface.addCallback("foobar", foobar); } } </code></pre> <p>I would add a timout and then try again so that it tries again until Externalinterface is ready.</p> <p>Also I don't see the function "foobar" in your javascript code. I see callback passed in as a variable but without varifying that it is in fact 'foobar' this is hte kind of thing that can make testing a misserable event.</p> <pre><code>function testAPICallbackFromGWT(callback){ $clinit_26(); //added by the GWT compiler alert('callback to be launched 3 2 1'); callback(); } </code></pre> <p>I would simplify your testing example so that there are less moving parts.</p> <pre><code>// e.g. run just flash to javascript only ExternalInterface.call("alert", "hello out there"); </code></pre> <p>if that works</p> <pre><code>// establish the call from flash ExternalInterface.addCallback("hello_out_there", foobar); // and in javascript alert(typeof('hello_out_there')); // will be 'function' if exists or undefined if ExternalInterface did not work </code></pre> <p>This way you can get a handle bit for bit what is working and where it breaks down.</p> <p>Pay atention to the timing, if you can tigger your flash from button actions and your javascript from links you can illiminate a number of loading issues as well. of course you'll need to solve an autoload version for your launch but for testing manually triggered events can simplify things significantly.</p> <p>also because it's javascript the browser is relevant.</p> <p>I've seen consistent results in Firefox and Internet explorer that break down in safari and sometimes IE is the odd browser out.</p> <p>Sometimes Firefox is the only one that breaks. </p> <p>you just have to test them all.</p>

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