ActionScript 3.0 :: Why Some Instance On Stage Null While Others Are Not
May 11, 2010
I was just doing a menu system for a game project, as3 with Flash CS5. The navigation is build on the frame on the main timeline. When I was creating stuffs on the 3rd frame, the btns on the frame can not be called, returning "null", this is weird. With further study, I found that, if I delete a instance on frame 2, the problem on frame 3 will be solved. Then I found that giving the instance on frame 2 a name could also make things normal. What is happening? Why having a unnamed instanced on the previous frame could make the instances on the next frame "null"?
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Apr 13, 2009
From the main timeline, I am doing a menu[code]...
My scroll bar appears but when I trace stage into my ScrollBarClass this one is null trace(stage)
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Jun 6, 2011
For some reason, no matter what I try, a stage instance named 'track' remains null to the frame it's on. I've made sure that Auto-declare stage instances is checked. Is anyone familiar with this problem?
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Dec 19, 2009
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Jun 9, 2010
I am currently working with a contractor company that is hosting a flex based website. They are putting the swf files that I have developed into their flex site.The issue that I am having is that within my swf file I need to reference the stage.I do this by "MovieClip(parent).stage"... I do not use the keyword "root", I just reference my swf's root through however many "parent"s i need. It works fine when I publish on my own, outside of their flex site. When it is used in the flex site, they are getting an error that they cannot reference the stage/ stage is null. It is vital that I am able to reference the stage of my swf.
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Feb 18, 2011
I am trying to use this script to jump to a certain point on my timeline:
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Jul 13, 2011
i had clicked denied button of the Camera Access Dialog and made my cam instance to null Is it possible to bring back the Camera Acees dialog box again
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Mar 25, 2010
I've created an button object in flash. The button contains 2 layers. One is the background image and on top of it is a textField. The textfield is dynamic. I use the button inside a movieclip and I export it in a SWC. The I'm trying to use it in flex.
I'm trying to do this:
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I get and instance of the button(myComponent.button01 is not null in Flex debugger), but the instance of the textField(myComponent.button01.theTextField) is null and I'm not able to change the text(but the default text appears onscreen). The code is compiled correctly in flex.
I exported the in swc the button control as well. So the button is not the default SimpleButton from Flash, but an derived class generated by flash(with the same name as the symbol defined in flash). It contains theTextField memeber, which is null.
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Oct 6, 2011
I would like to know if there is a reason that, within an AS3 class, I would want to do something like this:
var myStageInstance:Stage;
//within an arbitrary class
var myStageInstance:Stage = stage;
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stage.addEventListener(MouseEvent, someFunction);
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May 13, 2011
In my document class named Engine, the stage variable is for some reason null:
package game
{
import flash.display.MovieClip;
[Code]....
This was working fine up until now. I just recently added two dynamic text fields into a symbol, and all of a sudden the stage is null. I really don't see the connection.
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Feb 10, 2009
I'm doing a tutorial and I get this error about the "stage". I just copied the tutorial code.. what's missing ?
Code: TypeError: Error #1009: Cannot access a property or method of a null object reference.
at ParticleDemo() at myFlashFile_fla::MainTimeline/frame1()
Code:
package {
import flash.display.Sprite;
import flash.events.Event;
[Code]...
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Jul 4, 2009
from my documentclass i got a isntance of the my view class in there i got a instance of navigation class extends Sprite I got a utilz.as file with all static public functions like this one
alignToCenter(obj:DisplayObject):vid
{
obj.x = obj.stage.stageWidth/2;
}
Utilz.alignToCenter(instance of navigation class)
I get a error stage is null reference..
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Apr 2, 2011
I keep on getting "cannot access property of a null object" errors. With the debugger I pinpointed my issue at the line where I write stage.stageWidth.So somehow the stage is null. This is within my Document class which is linked with the .fla. The strange part is that I haven't had this problem until just recently.
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Sep 8, 2010
I have just recently started playing around with AS3 and am pretty new to what is going on in Flash (though I do have a lot of programming experience.) I have an object that I am dragging around on the mouse. I want it to be destroyed if I drop it anywhere but in a target location. I have the part where it is destroyed working, but I am running into a problem trying to find the target. When I try the following...
PHP Code:
public function DropObject(){
if (! this.hitTestObject(stage.getChildByName("Target"))){
stage.removeChild(droppedObject);
stage.removeEventListener(MouseEvent.MOUSE_MOVE,droppedObject.MouseCursorMove);
}}
I get "TypeError: Error #2007: Parameter hitTestObject must be non-null." So, "getChildByName" is returning null, but I'm not sure why. I've verified that there is an Instance name of the Target on the stage. Why can't I find it?
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Aug 26, 2011
I have a removeChild and null question. I know removeChild removes my object from the stage but stays in memory until I call null on it. My question is, if I set the object to null, do I have to removeChild it at all? For example, I have a movieclip where I addChild lots of objects to it. So If I want to completely remove all traces of said movieclip and all its children, can I just set movieClip = null, or do I have to removeChild all its children and the movieclip itself beforehand.
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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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Apr 22, 2009
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at QuizApp/createStatusBox()
at QuizApp()
That's the error message I get when it tries to play. What I have is an swf that loads another when its done, the new swf is blank but has a document class to an AS file. It seems the problem lies when a function is not properly being added to the stage.
The function is added like this..
Code:
package{
public class QuizApp extends Sprite{
public function QuizApp(){
createButtons();
private function createButtons() {
if (this.stage == null) {
trace("STAGE IS NULL!!!");
} var yPosition:Number;
addEventListener(Event.ADDED_TO_STAGE, addedToStage);
...
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May 12, 2011
In my document class I have this
[Code]....
It does not matter where I declare the var __w:Who in the constructor, as a class var or in another function entirely. The whole thing still operates normally but it's irritating not being able to set my stage.align=StageAlign.TOP_LEFT; in the constructor.... I am guessing it is something in my Who class because it does not happen if I declare any other vars the constructor in Who pretty basic:
[Code]....
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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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Jan 19, 2010
Alright so I'm trying to call the instance named mcPac onto my stage using the addChild line, and everything I have tried personally has failed.
[Code]...
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May 5, 2010
I am getting a stack overflow error when attempting what I believe is a very simple task. I have a class that extends MovieClip and I attempt to add an instance to the stage. WorkSamples is the main class in my fla.
[Code]...
The Sample object does get added to the stage, although it doesn't honor the x & y position I specify. I'm sure I'm failing to comprehend something simple,
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Feb 3, 2009
I have one MC on stage with instance name "box". That MC duplicates by using this script:
Code:
duplicateMovieClip (box, newname="box2", this.getNextHighestDepth());
box2._x = xPoz;
box2._y = yPoz;
So the new MC is now called "box2".
Inside original MC "box", I have one button. After click on that button, I need to know on which MC I clicked. box, or box2. I tried to use:
Code:
trace (this._name);
But, that get me only instance name of the button.
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Apr 4, 2011
I'm using Flash CS5. I have some instances on my stage declared in the main class and I want to attach some events to them, however at the time of the main class constructor, these are declared as null.
What's the best practice for accessing stage instances? Is there an event listener I could add that will tell me when the stage instance properties have been populated?
Simple example:
public class bleepBloop extends MovieClip {
public var productName:TLFTextField;
public function bleepBloop() {
trace( productName ); // Here it is null
}
}
However, when I access productName later, it's defined.
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Apr 30, 2011
I created four instance of movieclip on stage and named them t1_mc,t2_mc,t3_mc,t4_mc. Then I made and array and loaded them inside the array
var arr1:Array = new Array( t1_mc, t2_mc, t3_mc, t4_mc );
var names:String;
//function made to add event listener to each object
function addListner():void {
for ( var i:uint = 0; i < arr1.length; i++ )
[Code] .....
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Feb 9, 2009
How can I refer to an instance on the stage if:
- I added it to the stage using the GUI
- I wrote its implementation in an external AS file
I can't assign it a instance name otherwise I get this error: Code: ReferenceError: Error #1056: Cannot create property myInstance on MyClassName.
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Nov 30, 2009
I`m having a silly problem with adding instance of an object to the stage two or more times. For example, this don`t work:
Code:
var temp0:SomeClass = new SomeClass();
this.addChild(temp0);
this.addChild(temp0);
Well, I know that one instance is one instance and two objects of the same class on the stage would be two instances, but still, it is what I need.
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Feb 19, 2011
addEventListener(MouseEvent.CLICK, clickAction);
function clickAction (e:MouseEvent):void
{[code]....
for every click it will adds a new btn_mc instance on the stage..I wants to add the btn_mc instance to the stage at only once... How can I achieve this?
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Mar 20, 2009
Does creating a new instance of an Object that uses an identical name to an older instance, delete the previous instance? Or should the original instance be deleted first? The code uses a ridiculous amount of XML vars. Isn't it less memory intensive to parse the XML and save the properties to an Object, and then delete the XML Object, rather than keep the XML Object around and reference it's child nodes directly? Is it better form to break up a huge XML file (>600lines/3200vars) into smaller chunks?
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Feb 4, 2012
I think my issue is to do with referencing the stage, but not to sure. When I try
[CODE]...
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Sep 9, 2009
i got this error Cannot access a property or method of a null object reference. whenever I clicked on my button
[Code]...
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