I'm not sure how you would expect this to work! The linker follows the dependency chain of all classes referenced by your code, and bakes them into the SWF.
Strings are just strings, it wouldn't make sense for the linker to look "inside" one. Button isn't actually a "built-in" class, there just happens to be a dependency link to it via Application. getClassByName (which is just a wrapper around ApplicationDomain.getClass, btw) can only see classes that are linked in. There is no way for it to find some class by string that hasn't been downloaded to the client - should it email the developer and say "please compile this and send me a copy"? :-) What are you trying to solve such that you can't just "new" your class? If you really need total decoupling like this, you might want to look into building a separately compiled SWF that contains your other classes, and loading that SWF at runtime. -rg > -----Original Message----- > From: flexcoders@yahoogroups.com > [mailto:[EMAIL PROTECTED] On Behalf Of pwhite40 > Sent: Saturday, February 18, 2006 9:46 PM > To: flexcoders@yahoogroups.com > Subject: [flexcoders] Re: addChild from String > > Did you ever get an answer on this? I'm running into the same > problem with getClassByName(MyCustomClass) blowing up unless > I create a dummy instance of it first. Even when I do create > a dummy instance first, it only works the first time I call the > getClassByName(MyCustomClass) method. After that, I start > getting "ReferenceError: Error #1065: Variable MyCustomClass > is not defined" all over again. > > Thanks, > Paul > > > --- In flexcoders@yahoogroups.com, "Brendan Meutzner" > <[EMAIL PROTECTED]> wrote: > > > > Hey Jens, > > > > Thanks for the help. It's now working (sort of)... > > > > If I create an instance of a built-in class (such as Button), the > > method below works fine. However, if I try creating a custom Class > > (eg. MyCustClass which extends from Canvas) like so: > > > > import custclasses.MyCustClass; > > var newComponent:Object = createInstance > ("custclasses.MyCustClass"); > > > > it doesn't work. I get the run-time error message "Variable > > MyCustClass is not defined". > > > > However, if I create a dummy instance of the class in my > application > > like so: > > > > import custclasses.MyCustClass; > > var dummyMyCustClass:MyCustClass = new MyCustClass(); > > > > and then create another instance using the createInstance method, > it > > does work. > > > > Ideas? > > > > Thanks, > > > > Brendan > > > > --- In flexcoders@yahoogroups.com, Jens Halm <[EMAIL PROTECTED]> wrote: > > > > > > > > > > Hi All, > > > > > > > I'd like to provide a String value which represents the > DisplayObject > > > > class I want to create dynamically with addChild. Has anyone > > > > accomplished this? > > > > > > You mean like this? > > > > > > public function createInstance (className : String) : Object { > > > var MyClass : Class = getClassByName(className); > > > return new MyClass(); > > > } > > > > > > > > > Btw.: what I really miss is a method createInstance(args : > Array) in > > > the Class class, so I could easily provide an arbitrary number of > > > constructor arguments not known until runtime, like this: > > > > > > public function createInstance (className:String, args:Array) : > Object { > > > var myClass : Class = getClassByName(className); > > > return myClass.createInstance(args); } > > > > > > Class.createInstance(args:Array) would be the constructor > equivalent > > > of Function.apply(scope:Object, args:Array). If I use > Function.apply > > > after I created an instance the constructor would be called twice > > > which would be quite dirty. > > > > > > Consider this as a feature request... ;) > > > > > > > > > Jens > > > www.oregano-server.org > > > > > > > > > > > > -- > Flexcoders Mailing List > FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt > Search Archives: > http://www.mail-archive.com/flexcoders%40yahoogroups.com > Yahoo! Groups Links > > > > > > > -- Flexcoders Mailing List FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt Search Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.com Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/flexcoders/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
