I spent a large portion of yesterday caught up in a bug. Basically, Flash would make a call to Javascript, and a while later, get a call back. It worked something like this:
ExternalInterface.addCallback("callback", function ():void { ... });
ExternalInterface.call("doSomething");
Unfortunately it didn’t work. I thought I did everything right, I set allowScriptAccess to “always”, and since the swf and html page were hosted on different domains, I grant access to the swf via Security.allowDomain. But, whenever Javascript tried to call the “callback” function I would be stuck with this Javascript error:
Error in Actionscript. Use a try/catch block to find error.
So I tried putting it all in a try/catch of course, but that had no effect. Setting ExternalInterface.marshallExceptions to true changed the error message, but was no more helpful. I changed the function, but the error message didn’t go away. I had a hunch Flash itself was throwing the error, and I managed to figure it out.
The callback function itself was located in another swf that was loaded by the swf that set Security.allowDomain. I loaded it in the same ApplicationDomain and SecurityDomain, so for all intents and purposes I thought there were all the same blob of code. That’s not true, at least where ExternalInterface is concerned. Once I set the same Security.allowDomain for both swfs, the error stopped occurring. Flash was throwing a SecurityError the whole time, but I had no way of knowing that was the problem without guessing.
Hope that helps anyone else who encounters this problem.
August 22nd, 2013 at 11:16 pm
The problem i had with this error was also related to allowscriptaccess, I was using swfobject, and in the params i set:
var params = {};
params.quality = “high”;
params.bgcolor = “${bgcolor}”;
…
params.allowscriptaccess = “always”;
…
The always value is in testing, on production I set the sameDomain.
Thank you for your post!
August 22nd, 2013 at 11:26 pm
Another useful thing is have the try catch on javascript and on flex (when calling the addCallback):
In Flex:
try { Security.allowDomain(“*”); ExternalInterface.marshallExceptions = true; ExternalInterface.call(“setFlexObjectId”, flexObjectId); ExternalInterface.addCallback(“sendFlagIsReadyToFlex”,functionInFlex);
} catch (error:Error) { trace(“Error in ExternalInterface”);
trace(“Error” + error.message);
}
In Javascript:
if (flexObject != undefined) {
try {
flexObject.sendFlagIsReadyToFlex();
} catch(err) {
console.log(“There was an error on the flex callback.”);
console.log(err);
}
}
November 18th, 2014 at 4:58 pm
I have a problem, maybe you can help me on this. I’m minkag an application where I have my swf and js files being referenced on my clients html, the idea is that the swf will communicate with my server and call a javascript function to write new html content in my customer’s html.When the three (HTML, swf and JS) are located in the same domain it works perfectly but when I make the test by calling my swf and js from an html page located on a different domain I get Unspecified error even when I added the System.security.allowDomain( * ); in my AS code.Can you please give me some ideas?Thanks.Allan