Actionscript 3 :: Automate Property Assignment To New Instance From Arguments In Constructor
Apr 8, 2010
I like finding out about tricky new ways to do things. Let's say you've got a class with a property that gets set to the value of an argument in the constructor, like so:[code]That's not exactly a hassle. But imagine you've got... I don't know, five properties. Ten properties, maybe. Rather then writing out each individual assignment, line by line, isn't there a way to loop through the constructor's arguments and set the value of each corresponding property on the new instance accordingly? I don't think that the ...rest or arguments objects will work, since they only keep an enumerated list of the arguments, not the argument names - I'm thinking something like this would be better:[code]
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Jan 28, 2010
I know what instance variables, contractor methods, local variables and constructor arguments are (I think) but I'm confused as to when or how to use them, for instance I have use this a lot and I don't really understand why it is used like this...
[AS] package standard.testing {
import flash.display.MovieClip;
import flash.events.Event;
import com.greensock.*;
[code]....
Why create a function with arguments...
[AS]public function tweenMe(mc:MovieClip, xPos:Number, yPos:Number)[/AS]
Then create instance variables...
[AS]
public var _mc = MovieClip;
public var _xPos= Number;
public var _yPos = Number
[/AS]
then create local variables with the values of the arguments
[AS]
_mc = mc;
_yPos = yPos;
_xPos = xPos;[/AS]
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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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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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Jul 10, 2009
I've got a simple class:
package somepackage
{
import flash.display.MovieClip;
public class NewMc extends MovieClip{ public var myVar:String = "something";}}
And there is a question now: how can I assign a "real" MovieClip object to my created-class object?
I mean: var realMc:MovieClip = new MovieClip();
[Code]...
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Nov 21, 2005
Is it posible to have predefined arguments in a constructor so if the user doesn't enter one it takes the default value? I tried doing it this way:
[Code]...
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May 5, 2010
I have a bunch of sprites in my library which all behave in the same way.
now i want to put the behavior and all the common methods into one BaseClass [code]...
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Jan 3, 2012
I'm having a weird behaviour with some some classes that I'm making. It seems that the Boolean values from arguments get changed on the way. I have two classes. On is called Carousel and the other Activity. The Carousel main task is to instantiate several Activity objects and place them in a way that resembles a carousel. This part is done, but there's a problem passing arguments from Carousel to Activity. Some data to instantiate the Activity come from an XML file. The XML resembles something like this:
[CODE]...
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Apr 14, 2012
I'm making a game in action script 3. In it, I have an actor class from which player and enemy classes will be derived. I'm doing this so that unless I need to provide specific AI or fancy behavior (such as for bosses), I can just make a new clip in the library for each enemy without making an actionscript file.
However, I've run into a problem.
Whenever I try to pass arguments to the construction of an enemy (make it spawn with more health), I get error 1136 (Incorrect number of arguments.)
This is because the constructor created automatically at runtime doesn't have the same arguments as it's parent class. Is there any way to get around this without making a class file where I copy and paste the parent constructor function for each of my hundreds of enemies?
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Apr 17, 2010
I'm passing a DisplayObject to a command that will instantiate it. Something like this:
// ViewClass is passed into this method typed as a Class
var view : DisplayObject = new ViewClass() as DisplayObject;
Is there a way to pass arguments to ViewClass() without knowing it's type? I'm assuming the list of parameters passed to any object's constructor is an array, but I'm not certain how to proceed.
I know I can do something like this:
// Assume arguments, an Array of arguments, has also been passed in
var view : DisplayObject = new ViewClass(arguments[0], arguments[1], arguments[2], arguments[3], arguments[4]) as DisplayObject;
But clearly I'd like something more dynamic, like to be able to just pass the arguments Array directly. I suppose all of this, however, goes against any type safe checking
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Jul 15, 2010
I've drawn a pretty button in Flash and given it the Class name PausePlayButton. It extends PlayerController, which allows it to toggle on and off and control whether a MovieClip is playing or not.When I instantiate it, I want to pass a reference to the MovieClip it controls into the contructor so that PlayerController has access to the MovieClip's public methods. However, I can't pass a reference into the constructor of PlayerController, unless I can pass it into the constructor of the symbol itself and call super. But where is that constructor? How do I give the button a reference to another object?
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Feb 10, 2009
I have created a class:
Code:
package net.icsna.website
{
/**
* ...
* @author Kyle McKnight
[code]...
And then I create a new instance of the class:
Code:
var scroller:Scroller = new Scroller(_contactDisplayPage.getChildByName("contactInfoHolder"));
And I'm getting an error 1136:Incorrect number of arguments. Expected 0...
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Oct 30, 2011
I'm having trouble with the constructor for a custom Class tied to a library MovieClip.
Say I have a MovieClip in my library named Circle, which is tied to the class com.shapes.Circle . I want the Circle class contstructor to take 2 arguments, xScale and yScale:
public function Circle(xScale:Number, yScale:Number) { }
However, if I try to call that from in code, for example Circle ball = new Circle(3.14,2.0); , I always get an "Incorrect number of arguments. Expected 0" error.
Is it possible to have a custom class tied to a MovieClip that can take arguments, or does Flash not allow this? I'd asked about this before and thought I figured it out, but from looking at it now I apparently hadn't figured it out and had resorted to a sloppy workaround; I'm hoping to fix it now.
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Feb 28, 2010
Is it possible to pass constructor arguments to instance objects which I place on the stage? Are the instantiations of instance objects centralized somewhere as with .NET WinForms so I can just edit the xxx = new CustomRecangle() constructor?
public class CustomRectangle extends MovieClip {
public function CustomRectangle(width:int, height:int) {
this.width = width;
this.height = height;
}
}
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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 11, 2012
[Code]....
I keep getting this message <b> Left side of assignment operator must be variable or property</b> How can I get around it?
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Apr 11, 2011
Is this possible ? If yes how ?Otherwise what's the alternatives ?
By dynamically I mean using
loader = new Loader();
loader.contentLoaderInfo.addEventListener(Event.COMPLETE, finishLoading);
[code].....
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Jan 30, 2012
I'm using flash cs5.5 and i got the fallowing error:Left side of assignment operator must be variable or property_loc2.__set__counter(++_loc2.__get__counter());This is the line witch don't work.But to be sure you understand,i will add the whole script,is for a game, this error causes the text ballon don't work.
class com.clubpenguin.ui.balloons.BalloonManager extends MovieClip
{
var _shell, _engine, _interface, attachMovie, onEnterFrame;
[code].....
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Feb 25, 2012
I am trying to assign true/ false using for loop
for (i=1;i<31;i++){
_global.level + i + Access = true;
}
and got error as "Left side of assignment operator must be variable or property"
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Feb 28, 2005
**Error** Scene=Scene 1, layer=actions, frame=1:Line 2: Left side of assignment operator must be variable or property.
bg-mb_mc._alpha=50;
I have a timeline with 3 jpgs on it that have been converted into symbols.
bg-gooto_mc is an instance of bg-gooto
bg-mb_mc is an instance of bg-mb
bg-lace_mc is an instance of bg-lace
When I try ... bg-mb_mc._alpha=50; I get the error.using setproperty ("_level0.bg-mb_mc", _alpha, 45); works ok.
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Nov 14, 2011
I have a swf that I want to edit.I decompiled it and edited the one value I wanted to change (It was how many items were displayed). Now, I get a few AS I cannot fix, I know enough AS to get by, but this is above my head.I have two errors, they both say: Left side of assignment operator must be variable or property.
ActionScript Code:
function goNext()[code]..........
I marked the lines that have syntax errors.they are hosted on my test server and I can PM you links. (I am building a website and don't want the link out there.
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Jan 12, 2012
I have an XMLList in actionscript
var xmlList:XMLList = new XMLList();
var xmlList2:XMLList = new XMLList();
xmlList = xmlList2;
If I make operations on xmlList2, is xmlList affected?
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Jan 7, 2010
As we know whent here is no such variable of null value assignment to a variable or instance flash throws this kind of Error.In one of my Application i need to get more flashVariables, They may or maynot come as FLASHVARS. But when i miss any variable flash thows this error as an alert box. is there any simple solution to avoid this kind of issue
when i use try,Catch statement the issue will not come, But i don't like to write Bunch of try,catch statement for all this kind of variables.
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Nov 15, 2010
is it possible to obtain the instance name of a class from the class without having to manually pass the instance name as a string parameter to the class constructor?
//Create New SizeClass
var big:SizeClass = new SizeClass();
//-------------
[Code]....
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Jan 15, 2009
Im new to AS3.[code]I have above code in a movieclip which i have Exported as a Class.But when i run it says "Constructor functions must be instance methods".
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Mar 4, 2010
I have a Sprite in my library that is linked to a class (lets call it SomeClass), and i put on stage in Flash, and name the instance someClass. In my Main.as i then write:
var myClass:SomeClass = this.someClass;
SomeClass.as has a constructor with the same name as the class, however it require an argument. How do I pass that to the class when I made an instance of it directly in Flash by dragging it to the stage? (instead of the usual ... = new SomeClass(arg); )
I tried something like this:
myClass.SomeClass(arg);
But that gives me this error:
1061: Call to a possibly undefined method SomeClass through a reference with static type SomeClass.
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Nov 8, 2010
Is there any difference in performance, or instantiation speed, between the two? Will anything be different in the instantiation of the MyClass object?
public class MyClass
{
private var _myObject:SomeClass = new SomeClass();
[code].....
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Jun 14, 2009
I'm using flash and the error message "Constructor functions must be instance methods." appears for the following code:
invsibleBtn.addEventListener(MouseEvent.CLICK,onClick);
function onClick(event:MouseEvent):void { navigateToURL(new URLRequest [URL]New to action script coding.
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Jul 20, 2010
I am trying to link buttons in Flash to placeholders on the time line, but keep getting this error message, any ideas what it means
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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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