Question

HI,

im trying to call a javascript function from my actionscript code but its not working;

as3:

if (ExternalInterface.available)
  {
  try
  {
    ExternalInterface.addCallback("changeDocumentTitle",null);
  } 
  catch(error:Error)

js (inside velocity file using swfobject)

function changeDocumentTitle() 
    {
        alert('call from SWF');
    }

anyone know what could be happenin?

Answer 1

If you are trying to invoke a JS function from within your Flex app, you want to use ExternalInterface.call(…) and not ExternalInterface.addCallback(…). From the docs:

public static function call(functionName:String, … arguments):*

Calls a function exposed by the Flash Player container, passing zero or more arguments. If the function is not available, the call returns null; otherwise it returns the value provided by the function. Recursion is not permitted on Opera or Netscape browsers; on these browsers a recursive call produces a null response. (Recursion is supported on Internet Explorer and Firefox browsers.)

If the container is an HTML page, this method invokes a JavaScript function in a script element.

http://livedocs.adobe.com/flex/3/langref/flash/external/ExternalInterface.html

addCallback() is used if you want to expose an ActionScript function from your Flash app to the HTML container so that it can be invoked via JavaScript.