ActionScript 3.0 :: Using Square Brackets And String To Instantiate Class?
Oct 13, 2010
I have some classes stored in a swc which I would like to instantiate using data pulled in by xml - using a string to reference the classname.So where I would normally use
ActionScript Code:
var tagline:Sprite = new Tagline1();
I would now like to do something like
ActionScript Code:
var tagname:String = "Tagline1"; // really the string comes from XML
var tagline:Sprite = new [tagname]();
I have a vague idea this is possible using square brackets, but I don't seem to be able to find out anything about it.
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Jun 20, 2011
I'm trying to do that trick where you make a variable name with square brackets. I think I don't fully understand what I'm doing though...
Code:
var cursorDirection1:Point = pt.subtract(rootpos1);
var cursorDirection2:Point = pt.subtract(rootpos2);
var farShoulder:int = 1;//1 = left 2 = right
[Code]....
I'm trying to avoid having to do a conditional to choose between cursorDirection1 or cursorDirection2. My last line there isn't working, I'm not entirely sure why. Assuming farShoulder is 1, the code should be interpreted as
Code:
cursorDirection1.normalize(findNormVar(cursorDirection1));
but I'm getting errors about the input being undefined.
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Jun 20, 2006
I'm stuck with trying to target a movieclip dynamically from a loop. I'm using the square brackket syntax but I can't figure out why it's not working. Here's what I'm trying to do:
Code:
this.t1.t1._alpha=20;
And here's how I'm trying to do it:
Code:
this["t"+1+".t"+1]._alpha= 20;
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Aug 10, 2007
I'm reading a book on ActionScript and I'm in the section on controlling movie clips. I'm reading about the basic methods, and I'm starting to realize I still don't fully understand the significance of square brackets.[code]Obviously, this is the prototype form of the lineStyle() method. What I don't get is why "thickness" is the only parameter without square brackets. I know that square brackets are used for retrieving data from an array or object, but either my book doesn't cover why they're used like this in a method, or I just completely blanked it out.
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Aug 3, 2011
I've got a string which, in run-time, contains the name of a class that I want to instantiate. I read suggestions to use
flash.utils.getDefinitionByName():
var myClass:Class = getDefinitionByName("package.className") as Class;
var myInstance:* = new myClass();
However, that gives me the following error:
[Fault] exception, information=ReferenceError: Error #1065: Variable className is not defined.
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Oct 19, 2011
I am kinda new to as3 and I have seen [] the square brackets used when trying to access array index but I have also seen some people use it in other places. I was just wondering what its exact function was.
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May 31, 2009
I have an SWF that has a var that is a string called fullpath. Now, if fullpath was "game.item1", How would I evaluate it as _level0.game.item1 in brackets [] rather than _level0.game.item1.Basically, how would I evaluate an item path from a string with brackets []? This is AS 2
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Dec 12, 2011
I would like to know if its possible, to use a string in order to create a UI element.I think many people have this kind of problem, they want an easy setup in flash to generate a dynamic UI, through code.It should look like this (pseudo code):
addToStage("Button","add");
addToStage("TextInput","name");
private function addToStage ( o : Object, str : String ) : void {
[code].....
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Mar 18, 2010
I have some classes: LowA, LowB, LowC, SpaceShip, that all subclass BaseChar. How can I instantiate one of the subclasses by using a string for the name. (I have been trying to get this to work for a couple of hours now). For example, the typical way that I have been instantiating the subclasses:
[Code]...
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Sep 19, 2009
I keep getting this error: Incorrect number of arguments. Expected 0.Probably just something stupid... but I'm struggling...I have two classes (ribostrand.as and nucleo.as) in a folder called architect. The main FLA file is outside the folder.I'm trying instantiate the nucleo class with parameters, from the ribostrand class... but its not working.
var ribo:nucleo = new nucleo("A",50,50)
< code moved to the next thread and reformated >
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Oct 28, 2009
I was chatting with my buddy about this, he is convinced you can do this and says he has done it, but I cannot get this to work.
I am wondering if it is even possible at all. I tried typing a var as a Class that is within the externally downloaded SWF and then making an instance but no can do.
some code
private static function onCompleteHandler(e:Event)
{
dashboardObject = e.target.content;
// registerClassAlias("Dashboard", ); doesnt work
[Code]....
So it seems you cannot make an instance of a class unless it is complied within the project SWF. Which if true is what I want it to do. I do not want people trying to make instances of my classes just from downloading the SWF file for what I am building here.
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Feb 11, 2011
I have an abstract class which gives specific 'base' behavior to multiple sub classes. I want to instantiate a Singleton inside this abstract class. Is it good practice to:a) instantiate a class within an abstract classb) do this with a Singleton (I know these may be frowned upon)For clarity I will give an example, the method instantiating the Singleton is:
public function createErrorRepository(repositoryType:String):void {
this._errorFactory = ErrorFactory.getInstance();
this._errorRep = this._errorFactory.createErrorRepository(repositoryType);
[code].....
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May 26, 2010
To call a class we would type: var testClass = new TestClass();Can I store the class in an array, and somehow pull it when I want to call it the same way? I need to be able to call a new class like the example above, but from an array.
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Mar 23, 2011
How can I instantiate another class object from a class instance? In the code below (which doesn't work) I'd like the function to return a new class instance based the passed argument's class. In other words, I want the function to return a new instance of MySprite without having to call new MySprite();.
var mySprite:Sprite = new MySprite();
var anotherSprite:Sprite = makeAnotherSprite(mySprite);
function makeAnotherSprite(instance:Sprite):Sprite {
return new getDefinitionByName(getQualifiedClassName(instance));
}
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Nov 15, 2010
I'm trying to use a listbox to instantiate a class. "SEA30_05_215_Single_Classroom" is a class that is loaded in using another function just fine. When I attempt to use the function below I get an error that says "Instantiation attempted on a non-constructor."Any ideas how to either fix the error or do it a different way? It seems like it should be a fairly simple thing to instantiate a class using a list box..[code]
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Nov 18, 2010
The following code works to instantiate a class from a listbox selection...
[Code]....
But when I try and load the same label and data from XML it does NOT work... Below is the for loop that I'm using to parse my XML and populate the listbox:
[Code]...
The setupID should be populating with a class that I can instantiate (just like when I hard-code it without using XML). Instead I get the error "Instantiation attempted on a non-constructor." I also received this error when I had quotes around the hard-coded version. So, I'm assuming that maybe the XML is being read as a string. But I haven't been able to find a way to cast it differently. I've been stuck on this for quite some time now.
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Apr 13, 2011
Possible Duplicate: Where is the "proper" place to initialize class variables in AS3
Whether its better to instantiate class on it's variable declaration or within a constructor? For example, this:
protected var _errorHandler:ErrorHandler = new ErrorHandler();
or this:
protected var _errorHandler:ErrorHandler;
public function someClass() {
_errorHandler = new ErrorHandler();
}
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Dec 27, 2011
Can someone point me in the right direction on how to instantiate any class at runtime with any given number of arguments?
As an example and to be more precise, I included an example below. How could I write this example in one line of code - ok, maybe two : )
[Code]...
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May 31, 2010
I purchased a coverflow gallery and I trying to using it wthout the Document class.
I trying to instantiate the class in other movie using this code:
Code:
package {
import flash.display.MovieClip;
import com.greenlab.website.cf.CoverFlow
[Code]......
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Feb 17, 2010
Using org.as3commons.reflect I can look-up the class name, and instantiate a class at runtime.I also have (non-working) code which invokes a method. However, I really want to set a property value. I'm not sure if properties are realized as methods internally in Flex.I have a Metadata class which stores 3 pieces of information: name, value, and type (all are strings).I want to be able to loop through an Array of Metadata objects and set the corresponding properties on the instantiated class.[code]I realize that I have to declare a dummy variable of the type I was to instantiate, or use the -inculde compiler directive. An unfortunate drawback of Flex.Also, right now there's code to account for typecasting the value to it's specified type.
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Apr 6, 2010
example:
var c : Class = Sprite;
//This can be random class such as movieclip/etc
var o = getDefintionByName(getQualifiedClassName(c));
this works, but in flash develop, it says that the variable 'o' has no type declaration
which basically means
var o : SOMETHING = getDefintionByName(getQualifiedClassName(c));
but how do i put that something there when i do not know what its coming because of random classes?
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Sep 1, 2011
I'm unsuccessfully attempting to instantiate a reference of a class that is passed as a parameter to another class. In this example there are 3 classes:
MainClass, Canvas, MyCircle
From the MainClass I am creating an instance of Canvas, which is passed a class reference of MyCircle as I want to create instances of MyCircle from within Canvas. However, the MyCircle constructor contains required parameters that are created from within Canvas. How can I pass and instantiate a class reference with required parameters?
MyCircle:
package {
//Imports
import flash.display.Shape;
//Class
public class MyCircle extends Shape {
[Code] .....
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Dec 3, 2011
In my Runtime Shred Library SWF I have a class named BackButton that extends MovieClip and interfaces IGameButton:
package com.game.button
{
import com.interfaces.IGameButton;
[Code].....
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Dec 2, 2010
when creating a dynamic square with the api. 400 by 400. I am not sure why it wont draw the object
[Code]...
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Jun 11, 2002
I would like to dinamically create array variables, depending on a XML file. The problem I have is that I don't know how to create them dinamically using a name I have constructed into a string variable. What I would like is something like this:
var strVarName;
...
strVarName = "Var" + i;
var strVarName = new Array();
...
So I would have n arrays called Var1, Var2, ... Varn.
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Apr 12, 2011
I've seen the embed tag used before the class definition, but I just saw that Keith is using these..
[Event(name="select", type="flash.events.Event")]
[Event(name="close", type="flash.events.Event")]
[Event(name="resize", type="flash.events.Event")]
[code].....
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Jun 12, 2009
i'm trying to do is to move all the squares. I've got a Square movie clip class in my library. The program should populate an amount of squares, unfortunately the amount can vary, which is why i haven't just gone with
var square1:Square = new Square();
var square2:Square.. etc.
var thisSquare:Square;[code]........
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Jan 15, 2010
I have this game, and some levels have a moving square as the player, you move the square with your arrow keys.... I want to have an enemy square that chases the player square.... They only chased mario when you didn't look at them? Kinda like that...... but in this regards:
I only want the enemy square to chase the player square when the player square moves.... soo say the player square moves 5 pixels per movement (know how to do all that), I want the enemy square to move when the player square moves..... towards the player square at like 7 pixels per movement..... so eventually you won't be able to avoid the enemy square....
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Apr 30, 2009
When I mouseover the square and it expands and when I mouseout the square it should shrink back to its original position. The expandSquare works but the shrinkSquare doesn't.[code]
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May 24, 2010
how do convert the myString var which is a string to the class name?
var myString:String = "movieClipInTheLibraryClassName"
var t:myString = myString()
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