Flash :: Static Variable Showing As Null
Feb 13, 2012
I have a class named Locator that I use to GeoLocate a user. There's a static method in that class called "locate()". This method then calls another method which sets a static variable called "loc" to an instance of a LngLat class.The issue I'm having is, when I call the locate method at Frame 1 on the scene, and then try to access the loc variable it shows as null... but when I trace the loc variable after it's set in the Locator class it shows as an object.[code]and then trace the variable at the end of the static method in the Locator class it shows as a object and the city is traced as expected.
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Feb 5, 2010
Basically I have 2 classes, A and B. B derives from A. Inside A, I declare a static variable/constant to the class of B. When I run the program, I get a null object reference error, with the line pointing to the class declaration of B, i.e.
Code:
public class B extends A
For reference, these are the 2 classes:
Code:
package
{
public class A
{
[code]...
Also, this error only occurs when the variable is static. If it's just a normal variable it works fine, i.e.
Code:
private var OTHER:Class = B;
If I change the static variable to point to a different class, it's also fine, i.e.
Code:
private static var OTHER:Class = Main;
I can probably work around this, but it's a bit of a pain in the ass. Anybody know what's causing it, or is this a Flash bug?
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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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Dec 24, 2009
Recently whenever I tested my swf it did not show any text (static or dynamic) but if I preview the html version then it showed all the text.
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Jul 12, 2011
I'm trying to change a static variable in the class's constructor. At the start I have:
public static var mainReference:Main;
public static var timerReference:Timer;
public var timer:Timer = new Timer(1000);
This is so my static functions can access main and timer. At Main's constructor I have:
mainReference = this;
timerReference = timer;
The problem is, the first gives no error when I compile it, but the second tells me Access of undefined property (timerReference).
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Dec 14, 2011
Is there any way that you can have dynamic variables inside of a static function considering that you can't use "this" inside a dynamic function.
What I am trying to do:
public static function convertToDynamicString(pString:String):String
{
if(pString == "" || pString == null) return "";
[Code]....
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Oct 16, 2010
The Idea is i want to make avariable that stores his value after i close the swf and open ti again,
an example:
i make acounter
var i:int = 0;
var timer:Timer = new Timer(1000);
timer.start();
[Code]....
the value of i will increase but after i close the application and open it again the value will return to 0 , keep the variable stores his value after closing the application ?
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Mar 24, 2012
This is not working. If I trace(urlPath) showing - null.
var urlPath = ExternalInterface.call("window.location.href.toString");
if(urlPath != "[URL]"){
trace("Yes");
pageMsg.text = "this is html"
} else {
trace("no");
pageMsg.text = "This is swf"
}
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Apr 26, 2010
why i keep getting Parameter child must be non-null. And my code won't display 5 enemyBlock objects onto the stage but only just one.
returns:
TypeError: Error #2007: Parameter child must be non-null.
at flash.display::DisplayObjectContainer/addChild()
at flash.display::Stage/addChild()
[Code]....
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Apr 13, 2011
What is static variable. what is difference between static variable and public variable?
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Feb 7, 2011
I need to keep my "grid" + [o] value from 1-9 but add to the to the gridArray number (hence currentNo) within this double loop.
[Code].....
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Nov 10, 2011
How can I replace
public function Mainclass()
{
Calculations.getDistance(5,9,4,2);
}
[Code]....
I'm not lazy (lying? :p), but I use the class more than 20 times, and it looks better if I replace al these long classnames.
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Sep 26, 2010
It is possible to call variables using this[ "stringname" ] for instance, to refer to a variable called "stringname".
However, when referencing a static variable by the name "stringname", the "this" attribute no longer works if applied.
Is it possible to use this technique with statics?
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Oct 7, 2008
I've been trying to create a script that pulls the current time and turns it into a variable, the problem is the variable keeps updating as the time changes, where as I need it to remain static as the time that is was when the variable was first created...it's just a simple:
Code:
var theTime = today.getTime();
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Jul 10, 2010
I've a question about variables in AS3 OOP. Do I have to set them to null or I it's not needed when I define them in beginning of the class? I just noticed someone doing so so I wasn't sure is it right or no.
private var _mcComponentHolder:MovieClip = null;
private var _mcComponentHolder:MovieClip;
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Jun 1, 2009
In the following class
Code:
package
{
public class Factory
{
[Code]]....
A break point on the "Okay" line shows that x1 is null but x2 is equal to "<entity id="DRONE" points="100"/>".
If I take the whole block out of the switch statement, both x1 and x2 are equal to the expected xml.
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Feb 25, 2011
I've rarely used static variables or methods when creating external classes, but I have on occasion, and it's very useful when I need global access to a value. I've seen negative criticism on the use of the "static" keyword, but never understood why. Is there a right and wrong way of using it, or is this not true? I'd like to use it in a context similar to classes such as MouseEvent or TextFieldAutoSize, where there is a list of values globally accessible for identification purposes.
It allows better code readability, and also allows for easy customization in the future. The value of TextFieldAutoSize.NONE is "none", but as long as a programmer used the reference TextFieldAutoSize.NONE and not the string literal "none", Adobe could change the value of TextFieldAutoSize.NONE to be "hahahahaha" and everything would still work just dandy because (TextFieldAutoSize.NONE == TextFieldAutoSize.NONE) is still true even though ("none" == "hahahahaha") is not.
Is there any kind of negative impact on using static variables this way? Or even functions for that matter? I'd just like to clarify this before I go and build a large project around the idea this is perfectly okay.
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Nov 3, 2010
How can I access a timeline variable from a static class / singleton?
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Apr 5, 2010
I have an actionscript class with a static member variable defined.
public class A
{
public static var x:int;
}
When I try to access it from different parts in my code I don't get the same value in each spot.
A.x
I am accessing the variable in different modules that are loaded, so they are all in their own separate .swf file.
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Oct 28, 2011
I am attempting to create cash register simulation game and am running into a problem with a conditional statement that I am using to check whether the correct change is being provided to the customer and if a button is being pressed or not. In this game, the user can see the amount of the sale as well as the amount the customer pays. With this information they have to click on the cash drawer slots which will increase a variable called changeCount by the value of the monetary unit they have selected.
I am using an if statement to take them to the next frame if the changeCount = payment-sale and the confirm button has been pressed. To check for the button I am using a boolean to see if it is being pressed or not. For some reason, it is not registering the updated value of the changeCount for the if statement to work. If I trace the value with trace(changeCount); it will return the value I want.
The source code is pasted below:
package {
public class CashierMain extends MovieClip {
private var confirmBtn:ConfirmButton;
private var pennyBtn:PennyButton;
private var dimeBtn:DimeButton;
[Code] .....
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Jul 18, 2010
the script i wrote is working fine. but the script attached to the flash player which i have no control over is throwing a script error (im using IE8).how can i fix this? if i run it locally there is no error.
'null' is null or not an object
try { document.getElementById("").SetReturnValue(__flash__toXML(function() { return document.location.hostname; }()) ); } catch (e) { document.getElementById("").SetReturnValue("<undefined/>"); }
but this is from flash script and i dont have control over it. it just say JScript - script block.
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Feb 23, 2012
In the following code (thoroughly debugged) the first case (1) in the switch is met and a new instance of BannerSingle is assigned to retVal (the return value). Unfortunately, while the second case (2) is never met, the assignment therein to retVal takes place and I can't compile. When I comment out the assignment to retVal for "case 2:" everything works fine.
I've tried using an if/else instead and I still get the same odd behavior. Also tried a number of solutions involving separate variables, etc.
package fl {
import fl.IBanner;
import fl.Banner;
[Code].....
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Jul 22, 2010
I have 3 swfs, and let's label them MovieA, MovieB, and MovieC. MovieB is a child of MovieA, and MovieC is a child of MovieB. So the hierarchy goes like this: MovieA -> MovieB -> MovieC. Each of these movies have their own document class, so they are each essentially a class extending MovieClip.
Now I have this other external class which contains only static variables. Let's call this class "TestClass" and let's say one of its static variables is called "testVar". So in MovieB's document class, I imported TestClass and set testVar = "hello world". In MovieC's document class, I imported TestClass and traced TestClass.testVar. When I publish and run MovieB, testVar is successfully traced as "hello world". Now when I publish and run MovieA, testVar is traced as undefined.
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Dec 19, 2010
I'm currently working on a particle system for a game that I recently started development on, but I've hit a snag: I have a class particlecontainer that tells each particle what to do on enterframe, and which contains each particle as a child. I also have a class (mischandler) which has a static array that contains all current particles, as well as another static array that is a buffer to remove particles from the particlecontainer. Whenever a particle "dies", it calls a function which adds it to the buffer array in mischandler. However, when I try to access this buffer array from the particlecontainer class it does not recognize it as having any elements. If this is unclear here's a simpler explanation:
particlecontainer tells a particle to do it's enterframe function particle calls die() and adds itself to the removebuffer inside mischandler particle container tries to access mischandler.removebuffer but removebuffer has no elements Strangely, the particle can access the removebuffer perfectly fine and sees all the elements in it.
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Nov 14, 2010
first i using flashvars to send my $_session["username"] to flash i have a button in myflash that can see are they any user logged in when pressed the button..
[Code]...
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Jul 25, 2009
Is there a way to pass a null variable through a function? For example:
[Code]....
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Nov 20, 2010
I have a button, and inside the button, i have a dynamic text field that i want to display a global variable in the "over" frame. (when the mouse goes over the button)
Normally, to make a dynamic text field show a global variable, I put the dynamic text box INSIDE a movie clip, and then define the variable in the movie clip.
For example, i would put this into the movie clip containing the dynamic text box:
Code:
onClipEvent(enterFrame) {
variable = _global.variable
}
Inside a button though, it doesn't work! I'll leave an attachment as an example of what I want.
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Jul 22, 2009
I am creating a simple game for kids. On the first page, I added an "input text" field for their first name. I called the variable firstname.When they move to the next page, I used a "dyanamic text" field so I can call them by name on this page. It works. However, When I test the game, on the first page, where the firstname is input, it shows_level0.firstname instead of just a blank space for them to input their name. I know I fixed this in the past and it was something simple, but I can't remember how to do it
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Feb 22, 2008
I am wondering if anyone has experience this problem before:
[Code]...
I was experiencing some other "strange" behavior so I'm wondering if my code is getting too long. Maybe I'm running into some kind of limit. Has this happened to anyone else? Anyone know of some fixes? The loop is in a _global function, could that be causing a problem? other than that, the code is on line 4420 of the actionscript coding interface.
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May 5, 2009
I'm working on a sliding gallery like Hulu. Setting it up and the sliding slides in and out is working fine. However, I need to add and then remove a button to each slide as it comes in and goes out. (I initially tried including the button on each slide, a mc, but this proved problematic for the event listeners). So when the file loads up, I add a mc to the first slide of the group like so (features[] is an array of movie clips - my slides):
Code:
var goBtn:MovieClip = new FeatureButton();
features[0].addChild(goBtn);
goBtn.x = 350;
goBtn.y = 230;
So I add the button/mc to the first slide - works just fine.
So there are two handlers, next and previous. So I started with the next handler. The first thing I have to do is kill the button on the panel that is sliding out, so I do that like so:
Code:
features[featureCount].removeChild(goBtn);
goBtn = null;
(featureCount is a counter keeping track of the slides). This works fine. I click the next button, and the button on the slide disappears and we move to the next slide - perfect.
So then I add the following next - exactly like I did in the beginning:
Code:
var goBtn:MovieClip = new FeatureButton();
features[featureCount].addChild(goBtn);
goBtn.x = 350;
goBtn.y = 230;
This time adding it to the current slide coming in - but this generates the following error:
Code:
TypeError: Error #2007: Parameter child must be non-null.
at flash.display::DisplayObjectContainer/removeChild()
at featuregallery_fla::MainTimeline/nextFeature()
How I'm getting an error on the removeChild() when that is already gone. I assume "parameter child" means goBtn - yes it is null because it's been removed. But I'm not trying to do something with that. I can only guess this is a variable scoping issue with goBtn - but I'm not seeing how to resolve it. Flash file attached.
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