[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
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[flexcoders] Re: addChild from String
I'm using a Tree. Each node from the XML of the tree contains a
attribute with the name of the class that is to be instantiated when
a change event occurs.
The only way for me to use the String typed attribute containing the
name of the class to be instantiated, along with a new statement
would be with a switch statement to test the value of the attribute
and then instantiate the appropriate class. I know that I can do
that, but that also means that every time a new node is added to the
XML for the tree, I also have to modify the source code for the
function that handles the change event. If I can create the class
from the string name of the class, I can add nodes to the XML
without any further maintenance to the switch statement in the
source code.
--- In flexcoders@yahoogroups.com, Roger Gonzalez [EMAIL PROTECTED]
wrote:
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
bmeutzner@ 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
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[flexcoders] Re: addChild from String
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
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* To visit your group on the web, go to:
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Re: [flexcoders] Re: addChild from String
search the flash coders list for this, there are a ton of sollutions floating around in there. On 1/18/06, 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), themethod 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 VariableMyCustClass 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, itdoes 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
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