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POCalling a Flex/AS3 Callback from Javascript
 

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  1. POCalling a Flex/AS3 Callback from Javascript
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    <p>I have a Javascript API, which should be usable with GWT and Flex. Using the FABridge it is really easy to call Javascript methods from AS3 and vice versa. But when I try to register a callback to an AS3 method in my Javascript API I get stuck. Here is a short code sample:</p> <pre><code>public function initApp():void { if (ExternalInterface.available) { ExternalInterface.addCallback("foobar", foobar); } } public function foobar():void { //the callback function Alert.show("Callback from API works!"); } private function btnCallbackClicked():void { ExternalInterface.call("testAPICallbackFromJS", Application.application.foobar); } </code></pre> <p>And the simple JS method:</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>But this version does not work, because I always receive an empty function in my JS code. It seems that the FABridge is cutting the rest. Then I tried a different approach. I wrote a little JS method, which takes the name of the function and creates the callback from the JS side.</p> <pre><code>registerFlexCallback = function(registerMethod, callback, id) { /* workaround to create a callback for an AS method, which can be called by Javascript * registerMethod - Javascript method which shall be called for registration with the created callback as parameter * callback - AS method that shall be called by Javascript (available over the FABridge interface) * id - ID of the flash object (use Application.application.id in AS) */ var swf = document.getElementById(id); eval(registerMethod + "(swf." + callback + ");"); }; </code></pre> <p>This one works well with the Internet Explorer, but with no other browser. For example in Firefox I get the following error message: </p> <pre><code>NPMethod called on non-NPObject wrapped JSObject! </code></pre> <p>Can somebody tell me, what this error is about (maybe some kind of security issue)? Or does anyone have a better idea how to create callbacks for my AS3 methods which can be called by JS?</p>
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