Actionscript 3 :: Property Introspection Within A Class In Flex
Jan 21, 2012
Im bulding a class that has a bunch of properties, and looks something like this:[code]This compiles fine, but doesn't print anything. When i step through it, it seems to skip over the loop, as if "this" doesn't have any properties.
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Similar Posts:
Sep 30, 2010
While this is similar to another post, that post (does not indicate how to perform this (if it can be done) without instantiating an object. Also, without success I have tried multiple variations on the theme of:
class[method](arg)
class[method].call(arg)
method.apply(class, arg)
I have used Reflection in both C# and Java. BTW, the code that I am attempting to get to work in Flex is mirrored in both those languages and works as expected.
Non-functioning Flex Code:
private function ipMethodTester( ipMethodName:String,
shouldPass:Array, shouldFail:Array):void
{
[Code].....
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Jan 9, 2011
Lately i discovered MATE (for Flex development) and was wondering: how do i bind a property in a view (actually a navigatorcontent component) to another property in a class so that they stay in synchronization (meaning that whenever the property in the class changes the property in the view also changes).
So if we have a view called Target.mxml and a property targertProp how do we bind it to the class called SourceClass with property SourceProp?
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Mar 14, 2012
i am using xmllistcollection for displaying data in list. whenever i run my application data is display in list control, but this warning has displayed in console. How can i remove this warning warning: unable to bind to property 'xmlnode' on class 'XML' (class is not an IEventDispatcher)
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Feb 9, 2010
say that i have a base class called Base, that is Bindable and has a String property like this:
[Bindable]
public class Base
{
public var msg:String;
[Code]......
where msg is some textInput field. I am getting a message from the compiler that....
Data binding will not be able to detect assignments to "msg"
is there a limitation with data binding to a base class?
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Jul 15, 2010
I have this class
package somePackage
{
public class SomeClass
[Code]...
I want to be able to get those static property given it's name.
Example:
public static function getProperty(propertyName: String): SomeClass {
//don't know what goes here
}
[Code].....
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Nov 12, 2009
I want to extend the FileReference class of Flex to contain a custom property. I want to do this because AS3 doesn't let me pass arguments to functions through event listeners, which makes me feel sad, so I need this property to exist on the event target, so I can access it.I also want to be able to cast extant FileReference objects to this class without any fuss. I have:var fr:SmxFR = e.target as SmxFR and I want that to work; right now it just returns null.A blank, newly instantiated SmxFR object has the extended property in place, but all of its inherited properties and objects return Error: Error #2037: Functions called in incorrect sequence, or earlier call was unsuccessful.[code]I get living handle property from that, and all other (that is, inherited) properties throw Error #2037.So, maybe what I want to do is going to require overriding FileReferenceList? If the original objects must be instantiated to SxmFR, that's what I'll have to do, since I'm using FRL to allow the user to select multiple files at once. Are you guys sure there is no way to fast from a FileReference to my class?
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Nov 25, 2009
Is is possible to bind class properties to mxml components ? E.g.: I have a class A.as with a String property nameValue. What I want to achieve is always having the latest value of a mx:Text component in nameValue.
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Sep 11, 2009
I recently found a method (ByteArray.clear()) that FlexBuilder complains is possibly undefined; however, the method is in fact documented in the Flex LiveDocs. It must have been added in a later version of the SDK than I have installed. I'm not asking about this particular method, but I'm giving it as an example of the documentation issue that I'm trying to resolve. My questions are:
How can I determine what version of the SDK or Flash player that a method or property was added in? How can I tell which versions of the SDK are supported on which Flash player versions?
I want to be able to determine from the documentation, instead of compiler or runtime errors, what SDK and Flash player versions are needed to support newly added methods.
With Java I look for the @since javadoc tag when I need to know this, but I can't find an equivalent feature in the Flex docs.
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Nov 1, 2009
in AS3, I have an external class ImageLoader, that loads an image upon request. In that class, I have an event handlers:
[Code]...
I am trying to send the download progress updates back to the main Document Class and display it on screen, so I am trying to dispatch the event "PROGRESS_INFO" and then get the information from the passed Event Object, like so: Document Class
[Code]...
This however, is proving futile... any ideas on how I can get the progress info out of the IMageLoader class? note: I know I can add bytesLoaded & bytesTotal to a public variable, but then I won't get the benefit of seeing the bytesLoaded property update in the ProgressEvent class.
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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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May 14, 2010
I would like to know if it is the same to assign properties to my custom component in its own class, or from the parent document. Here I assign the property bottom in my custom component class:
<?xml version="1.0"?>
<mx:LinkButton bottom="20" >
<mx:Script>
Here I assign the property bottom when I use the component in my main MXML file
<myComp:Brick bottom="10"/>
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Nov 1, 2010
Given a dynamic or non-dynamic class like the following:
package {
public class MyClass {
public var myProperty:String;
public var myBooleanProperty:Boolean;
public function MyClass() {}
}}
Flex 3 allows you to assign a value to myProperty like this:
myClassInstance["myProperty"] = "myValue";
myClassInstance["myBooleanProperty"] = true;
I regularly parse XML to get property names and their values then update correlated classes using this technique; however, Flex 4 no longer allows assigning the boolean property. I don't have a work-around.
If you trace the results:
trace(myClassInstance.myProperty) // Returns "myValue"
trace(myClassInstance.myBooleanProperty) // Returns null
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Dec 11, 2010
I know that I can get info about constants, methods, etc of a class by using flash.utils.describeType. But I want to know if I can retrieve the asdoc comments of a class member.
I suspect, documentation is removed when classes are compiled into SWF so it might be impossible to get comments during run-time.
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May 29, 2009
I've got an object that contains a dozen or so fields I want to bind to form elements, so that I can use that object to send the data back to the server to be saved.
[Code]...
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Jun 10, 2011
I have some components declared in MXML tags, with some properties and event handlers.For some of them there is the need to re-instantiated, so I came up with the following architecture.Array of components that will be re-instanciated at some poin:
<flint:forms>
<fx:Component>
<login:LoginForm loginClick="outerDocument.form_loginClick()" />
[code].....
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Aug 18, 2011
This is more of a rant than a question; but I am curious to know if anyone has some insight for me. The application I am working on deals with a C# .NET backend; communication is achieved via a socket over which we push AMF objects. The AMF object class definitions are generated by the server side team and I just have to use registerClassAlias on the flash side to link them up - pretty standard; the only difference being that as they come from a C# background they prefer to use UpperCammelCasing instead of lowerCamelCasing for property names.
Today I got a bunch of updated AMF objects which I dropped into the project; but I noticed that after updating my project would no longer compile [code]...
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Jan 29, 2012
If I have three classes:
public class Example {
public function Example () {
}[code]............
You can see that the two last classes extend the first one, and both have the 'variable' property. In case that I have an instance of Example and I am sure it is also an ExtendedExample OR AnotherExtendedExample instance, is there some way to access the 'variable' property? Something like
function functionThatReceivesAnExtendedExample (ex:Example):void {
if(some condition that I may need) {
ex.func()
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Nov 24, 2011
I have the following inheritance structure:
var environment:AvEnvironment = new AvEnvironment(...);
addChild(environment);
environment.addChild(new Terrain());
environment.addChild(new Player());
I am trying to access a public property from AvEniroments class through the Player class, however I'm getting an undefined property error (#119). I've tried the following:
this.x = AvEnvironment.xs // public property in this class
this.x = parent.xs
I've also tried something like this:
var ev:AvEnvironment = AvEnvironment(parent);
this.x = ev.xs
but I get a TypeError. Error #1009: Cannot access a property or method of a null object reference.
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Jan 9, 2009
I have a class that looks like this:
[Code]....
now when i try to get the id form the Piece class like this it doesn't work, i've been looking at this for the better part of the past hour! what am i doing wrong?
ActionScript Code:
var player1:Player = new Player("eddie");
player1.setPieces();
trace(player1.pieces[0].id);///why is this not working! getting undefined!
// i tried datacasting i get null
trace(Piece(player1.pieces[0].id));
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Jul 2, 2009
I was wondering how do you access the stage property from a different class that's not the principal class tied to the fla? Essentially, I have main.as which calls another class menu.as, and I can't seem to be able to use the stage.stageWidth property from menu.as. What's the proper way to be able to use the stage property from any class? Do I have to import it separately each time?
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Jan 25, 2010
I couldn't work it out yet...
package components {
public class templateSelection extends VBox {
static public var tempSelectionBag:Dictionary;
[Code]....
I want to have a custom class tempSelection with a Dictionary as a public accessable property of that class. If I use this code, the compiler tells me:
1046: Typ wurde nicht gefunden oder war keine Kompilierungszeit- onstante:Dictionary
Which translates to:
Type was not found or was not a compile-time constant: Dictionary
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Jan 9, 2011
can I use the Class datatype to make a class a property, then create new objects from that class? Like so:
class Foo{
private var ExampleClass:Class;
public function Foo(exampleClass:Class){
[Code]....
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Sep 3, 2009
I have a document class that looks like this:
Code:
package
{
import Map;
[Code]....
Is it possible to access a property of the Map class (though map defined in the Document class) from within the hero class?
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Feb 28, 2010
The Main.as file will have all of the game logic, such as the mysteryNumber.
The other actionScript files represent rooms that the user may click and depending on the 'mysteryNumber', it will execute the 1 of 6 scenarios.
So for example, if a user clicks the Library page, the LibPage.as will call the 'mysteryNumber' and execute some code to display on the library page.
It will be the same for the other 4 rooms.
The problem I have is that the LibPage.as won't call the 'theNumber' property from Main.as
Here's the Main.as
Code:
package
{
import flash.display.MovieClip;
import flash.events.MouseEvent;
[Code]....
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Jul 26, 2011
Setting the text property of a flex DateField makes the selectedDate property of that DateField go to null.I need to set the text property so that I can use a particular format (DD-MMM-YYYY).
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Nov 30, 2011
In ActionScript 3, there are some classes that will represent a value rather than the class itself. It's hard to explain properly what I mean, so take this example:
[Code]...
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Sep 20, 2011
Can we put [Bindable] on functions/methods? I know that bindable is used to change the value of the source property to destination property. But not sure if we can use that for methods. why we cannot put/ if we can then what will be the outcome?
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Jan 23, 2010
I'm wondering if there is a way I can bind a flex property to flash property?, the flash property is inside a swc file created in flash with the Flex Component Kit for Flash Professional, I can manipulate the flash component as a regular flex component, but I want to bind their properties, is there a way?
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Jan 10, 2010
This seems like it should be an easy one but I can't figure it out.I'm trying out a very simple class that, when created, loads and XML file into the class's property. I must be getting a basic concept tangled up here because I can see the XML coming in just fine in the handleComplete function, but the class property _result remains empty.What concept am I missing here?
public class MyClass
{
private var _result;
[code].....
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