ActionScript 3.0 :: Create Class Instance Without Calling Constructor?
Feb 11, 2011
Is it possible to create an instance of a class without triggering the class' constructor?[code]In the case above, say I wanted to play around with a Foo instance, but I really don't want my global.foobarCount going up, nor do i want to pass in any value at all for bar.This could be useful for introspection where you want to learn more about or pass a particular class object but don't want to provide required arguments or trigger anything that the constructor may do.Is this at all possible? (Obviously, new Foo() just doesn't cut it here, since it would throw and arguments error, nor does just using Foo, since that's a reference to the class itself).
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Similar Posts:
Apr 11, 2009
How to create new class instance without calling constructor function, meanwhile constructor function must exist and is requiring 1 parameter.
var newclass:myclass = new myclass; <- still calls function myclass in myclass class
I would like to call constructor function later:
newclass.newclass(myparam);
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Nov 25, 2010
Is it possible to create a class instance dynamically and specifiy the constructor parameters dynamically?
So for example, imagine I have a class 'TestClass' which as constructor takes two parameters, (Array, int)[code]...
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Mar 1, 2011
I have a class with constructor and overloaded methods in it. When i try to import that class using blazeds i get an error saying [RPC Fault faultString="Unable to create a new instance of type 'some class'." faultCode="Server.ResourceUnavailable" faultDetail="Types cannot be instantiated without a public, no arguments constructor."] How to import class having overloaded methods using blazeds
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Jan 26, 2009
I have a document class name elevator and my constructor is also elevator as usualHow to call this constructor function within elevator class? Is is possible or not?
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Feb 17, 2011
I've got a simple program that consist of a document class and a buttonTemplate constructor class. I need to call a function called updateText that should be in the document class, when someone clicks on a button. So that after each button is clicked, it updates some text in my document class. My event listeners for the buttons are in the buttonTemplate class. My question is, how do you call a function in the document class from a constructor class? Here is my simplified code below
DOCUMENT CLASS
Code:
package {
import flash.display.MovieClip;
import flash.text.TextField;
[Code].....
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Nov 18, 2011
Im stuck with actionscript error, the error i got:- TypeError: Error #1007:Tried to create an instance in a no constructor. at Away3dScene/initObjects()
[Code]...
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Aug 18, 2011
I'm having a problem with customized Actionscript objects not recognizing thier own constructor. This is the pertinant part of my script:
ActionScript Code:
//File: Line.as
class Line extends Object{
public function Line(args){
[Code].....
Clearly, the variable "testLine", is one of my custom "Line" objects. Clearly, it has been made with the "Line" constructor. So why won't flash acknowledge this?
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Apr 17, 2007
For example, I have the class Bullet, with a constructor: Bullet(start:Point, target:Point)constructor
But, if this Bullet class extends the MovieClip class, how do I pass start and target into it? Right now I am using attachMovie to create instances of the class. (They behave correctly with the static properties set by the constructor, but to be useful it needs arguments.)
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Nov 6, 2011
I know I can create instances from a string like this:
var classFromClassPath:Class = getDefinitionByName(classPath) as Class;
var instance:Object = new classFromClassPath()
I know I can call some function with a parameter array like this
var x:Function = someFunction;
x.apply(null,args);
But does anyone know if I can pass parameters like that when I construct a class?
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Aug 29, 2007
I've been playing around with custom classes. My objective was to create a custom class (Testing) that would create a box when an instance of the class is created. I've tried three different approaches, however only (3) seems to be showing up. I'm just curious why (1) or (2) doesn't work?
Also is there a better approach than (3)? Since at the moment it's been created on _root. I hope the box can only be accessible through the instance. Since I'd like to incorporate the whole idea of public, private, encapsulation, etc.
[Code]...
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Sep 26, 2009
I've read through the Sticky in ActionScript 3.0 forum and looked through other threads in the topic but maybe I'm not using the right search terms. My problem is creating a new object in the constructor method, I've created a package "com.weenz.shutters" and created many class files within that package. The compiler is giving me the following 2 errors for the "Window.as" file[code]...
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Jul 27, 2009
If all I have is an instance of an object, can I call a static method of its class? For fun, let's say I don't know what the name of the class is, only the name of the static method.
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Sep 21, 2011
My method has been passed a class instance, but it was typed through an interface so I'm not 100% sure what class it is. I'd like to attempt call a static method on that instance's Class.. is there an easy way to do this without being forced to pass the class along as well?
Something like this:
ActionScript Code:
public function foo(myBarInstance:IBar):void {
var barClassPointer:Class = getClass(myBarInstance);
try {
[Code].....
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Jun 17, 2010
I have a library object (SomethingMC) which extends a custom class (Something). Something, in turn, extends MovieClip.If adding SomethingMC to the stage within Flash CS3 IDE, is it possible for it's super class (Something) to assign an instance name from a class constant (Something.THE_CONSTANT)?
package
{
import flash.display.MovieClip;[code].....
The above does not work. It throws Error #2078: The name property of a Timeline-placed object cannot be modified. if the instance is assigned a name in the IDE, and it just doesn't work if no name is assigned in the IDE.
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Feb 14, 2010
what i am trying to do is by pressing zero_btn which is an object in the library to print a number in the dynamic text box ( result_txt ) which is also an existing object in the library and on stage. my knowledge in actionscript is not much and messing with .as files is totally new to me! then thing is that this code when i locate into to .fla file works fine. there is no error with the code i posted, but am sure something is missing ... like calling the constructor of the .as file.In the library the name of it is Zero_btn and the instance name of this object is zero_btn and it is a button.[code]
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Jul 22, 2009
I have an as3 package which looks like
package {
// imports
public class ColoredSquare extends Sprite {
[code]........
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Feb 21, 2012
I am trying to pass a variable to a method in one of my Classes so I can use it to create the correct movieClip (image).
My Class code looks like this:
package {
import flash.display.MovieClip;
import flash.display.Sprite;
public class SlideShow extends MovieClip{
public function SlideShow() {
[Code] ....
I am getting the following error:
SlideShow.as, Line 30
1046: Type was not found or was not a compile-time constant: Background.
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Mar 27, 2011
I am learning JAVA, and of course I am naturally comparing it to AS3. I've noticed that JAVA classes have the ability to create instances of themselves:JAVA:
Code:
// JAVA example
public class Cube
[code].....
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Sep 12, 2011
I am writing a code where I am trying to create a sprite variable in one class, and create several new instances of that sprite variable in another that all need to be on the stage at the same time. For example I created a variable like this, var ball:Sprite = new Sprite(), then drew the sprite in the same class that that variable was created in, then using encapsulation (i.e. _myNewInstance:AddNewInstance = new AddNewInstance(ball)) I am trying to reference that variable and create several new instances of it in the "AddNewInstanceClass" through for loops.
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Aug 7, 2007
In as simple an example as I can think of, I have two classes: Dog and Cat. Both are subclasses of Animal, in this stupid example... I know how to create instances of both, however I don't know how to dynamically create them by name from a string. It would be something like...
[Code]...
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Jul 1, 2009
I am creating several classes. I am trying to create an instance of the classes in a loop, which isnt going very well.
[Code]...
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Nov 1, 2011
There's another thing I don't fully understand in ActionScript 3 yet...
Let's say I have a class that takes care of certain things (KeyPress events, to be specific). But when I want to access the functions inside this class, do I have to create a new instance of it?[code]....
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Mar 17, 2009
I am new to AS3 but not to AS2. I have written a simple class and when I import it, I don't see the object that should be created upon calling the constructor. Can you guys tell me where am I going wrong. And I am very puzzled about 'document class'. Yes, I have google numerous threads on "document class" but still very shaky on this matter. Here is my simple class which should place a button object on the stage when I create a new object of this class. Once I have created the BTN class, I have made sure that I have button component in my library, I then instantiate the object by creating a new CS3 file and importing my class:
import com.learning.as3.*;
var b:BTN = new BTN();
When I test the movie, I get the following errors:
1172: Definition com.learning.as3 could not be found.
1046: Type was not found or was not a compile-time constant:
BTN.
1180: Call to a possibly undefined method BTN.
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Feb 9, 2010
If a constructor takes its parameters as a vararg (...) it seems to be impossible to create a subclass that will just pass on that vararg to the superclass.
There is a related question with fix for this same situation for normal functions: Wrapping a Vararg Method in ActionScipt but I cannot get that to work with a super call.
base class:
public class Bla
{
public function Bla(...rest)
{
[Code]....
Aside from actually moving the handling of the parameters to the subclass or shifting it off to a separate initializer method
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Nov 7, 2010
is it possible to get the name of a calling function or the constructor from the called function? is it possible to determine the previous function of the thread?
i would like to call some setter functions from my constructor and have my setter functions determine if it was the constructor that called them.
currently, i'm setting a boolean for this functionality, but perhaps there is another way?
public function Constructor(myNumber:Number)
{
this.myNumber = myNumber;
}
[Code]....
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Jul 5, 2010
I want to create a class where when you mouse click on an instance of it, all other instances are notified about this click.
I want this functionality to be inside the class so there wll be no need to write any code outside the class definition, like assigning listeners to all instances and such.I wrote the following code but the event I dispatch doesn't get catched.
package sample{ import flash.events.EventDispatcher; import flash.events.MouseEvent; import flash.display.MovieClip; import flash.events.Event; public class labels extends MovieClip { var dispatcher:EventDispatcher = new EventDispatcher(); public function labels() { this.buttonMode = true;
[code]...
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Jan 24, 2010
I have a number of GUI dialogs defined using MXML. Assuming these mxml objects have been compiled into my application, is there any way to instantiate these objects using ActionScript, sort of like this?[code]...
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Feb 14, 2010
I'm working on a project right now in Flash Builder which is strictly AS3. I've written a bunch of code for various graphic assets that are being developed in the Flash IDE and compiled into a library swf. So, for example, I might have a drop down list Sprite which I layout in the flash IDE and then set its class to: [url].....With the library swf loaded into my project, if I need to create a new dropdown list I would say something like:
Code:
load.getDefinition(classes[name]) as Class
and then create a new instance of the class that is returned. I decided to try saying 'new DropDown()' instead of pulling the class definition from the loader, and I got a new DropDown. I figure this is because the DropDown library asset is now in the ApplicationDomain and Flash Builder knows that when I say 'new DropDown()' I'm saying [url]....' and it can find that class file. However if my library asset just had a class of 'Widget' and no path back to an .as file it would throw an error. Am I correct in this statement?
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Oct 20, 2010
I trying to create a TextField in a Actionscript file, But when I try to create an instance of the class in flash no textfield is appearing. [code]...........
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