ActionScript 3.0 :: Targeting A Textfield On Stage From A Class?
Feb 13, 2010
I'm trying to access a text field from what I believe is called a sub-class. The text field is defined in the .fla file and the .fla file is set up to use Main.as as its document class.I got three files; scrollText.fla, Main.as and TextUtils.as.I know most of the code is working as I programmed it all in Main.as first, but when I moved the code to target the text field into its own class file I ran into error "1120: Access of undefined property" although I have declared the variable correctly and early enough to be used at this point in my code.This is the code I got so far:Main.as
Actionscript Code:
package{ import flash.display.Sprite; import TextUtils; public class Main extends Sprite public function Main()
This is for AIR: My document class imports a separate class "ConnMonitor" and uses it to constantly monitor the network connection. It's at the very end of that class where it's supposed to update a textfield on the stage as the connection changes, but the class can't access the textfield.
How can I achieve this ? I tried MovieClip(root), MovieClip(parent), stage,mytextfield.text = ... etc. They all throw an null object reference problem.
Ive been talking about this in another thread, but I guess its a better idea to start a new thread to ask this question: How can I target a named instance of a dynamic text field that is inside a button, which is inside a movie clip, which is on the root timeline, from a frame in the root timeline?
I tried _root.movieclipname.buttonname.txtfieldname but that doesnt work...and to make issues a little more complicated, its not a static movie clip, but a duplicate that needs to be targeted every iteration of a 'for' loop.
I thought it would be something like -
_root.movieclipname[i].buttonname.txtfieldname
But thats not working...How can I target that textfield?
First let me say I'm relatively new to AS 3 and I've scoured the Internet looking for a simple solution to no avail.Here's my general situation:1) I have dragged a movieclip with an instance name of a_mc onto the stage.2) On the first frame of the timeline I am importing a class file and calling its constructor:
Code: import cardmaker.*; var coverMaker:CoverMaker = new CoverMaker();
I have a class called shapeC that only creates a rectangle and then addChild(rectangle);. That class is instantiated on the main timeline. Currently, the only way you can see that rectangle is to add the instantiated class to the stage via addChild(shapeC);. My question is, is there a way that the shapeC class can add the rectangle to the root stage without requireing the instantiated class to be added to the stage?
I attached a movie that I am working on. I use the duplicate actionscript to put several buttons on the stage when clicked. I then want to be able to use the color picker to change the background behind the buttons. As of right now it only works on 1 button and by changing the 6 in this code for (i=1; i<6; i++) to 5, 4, 3, 2 or 1 it will only change that button. How can I get them all to change at once?
I want to load a swf into a byte array before loading it into an swf loader. I'm wondering how I would target a specific swf loader to do this to since I have 3 different ones.
how to target MovieClips from a class. If I have a MovieClip on the stage named recMc and I want to manipulate it using a class, I know that if I attach my class in the Document Class field in my .fla file and then just do something like this... it works
I use the loader class to load in an external swf, a preloader movie in my class. (not a document class)
To target the properties in the swf (specifically the text field in it), I coerce it to a movie clip after it's loaded and add the child with:
var thumbPreloaderMC:MovieClip=evt.target.content as MovieClip;
now I can use: thumbPreloaderMC.preload_text.text "sometext";
to reach the text field. works.
But, I want to nest that clip in a container movieclip I'm placing all the thumbnails I'm loading in, thumbContainer.
So I create the movieclip thumbContainer, add the child, then add the preloader swf to this clip.
I can't name the loaded swf, it throws an error, I googled that and see I can't name an already named clip.
I get an error "TypeError: Error #1010: A term is undefined and has no properties."
First of all, I'm fairly green with as3 still, I think perhaps I should rethink how I'm structuring this. I could and would ask how to target a nested loaded swf from a class.
is nesting clips like this from a class bad practice? What are best practices when it comes to using timeline based animations like preloaders etc by a class? I'd like to make my class as reusable as possible, but one can't create all animations and graphics from code.
I am trying to code a flash app entirely in the document class. I am using GestureWorks with a touch screen. When a user essentially presses a button it calls a method that should hide a specific graphic but not the graphic they touched.
Essentially I need a way to refer to a graphic on the screen using a method besides 'e.target'.
I am receiving this error: Error #1009: Cannot access a property or method of a null object reference.
[Code]...
It can access photo1Sprite as 'e.target' when the button click happens on the photo1Sprite. The problem happens when to click one button (not photo1Sprite) and have it effect photo1Sprite. So I can make photo1Sprite react if my method is attached to it directly using 'e.target' but not if I am trying to call it from a method that was called from another element on the screen.
Ok, this is one of those walls that I know once I can jump over it, I will be a much happier developer again.
I've done tons of reading, and think I have a firm understanding that the general consensus is that if you want to reference something, it needs to be added to the display list, using addChild().
I hate to be defiant, but what if I don't want to?
Or at the very least, what if I want to add a movieclip class to the stage using addChild, and then reference objects inside it?
It is much easier this way than what most people recommend - adding 15 objects via addChild, then setting the x and y for the, etc.
That said, I'm all about using classes and using as3 the way it was meant to be used. So what this is, is a best practices question I guess.
HERE ARE THE STEPS I'M TRYING:
- Create new flash document
- Draw graphic symbol bg, with text field over it, select them, convert to movieclip symbol, and export class name "box", then delete it from stage
- Add document class .as file, which simply adds that class "box" from the library, to the display list using a simple addChild()
- Set a name for that box using box.name = "test" let's say
- Do a simple trace like the following - "getChildByName('test').textFieldName" - it shows up great
- So then, I'll now try to set the text by doing this - getChildByName('test').textFieldName.text = "yo";
That last line above, is what doesn't work. I know I'm referencing wrong, but how would a pro as3 developer, reference something on the stage within a movieclip class, from the document class?
I'm just now learning the new object oriented way of scripting. It's been a wild ride, but I've finally learned how to keep script off my frames (very hard coming from as2).Here's my problem:
I have a TextField on the stage in my main .fla file named loadPercent.
I'm loading a jpg with preLoad.as and displaying the bytes loaded in loadPercent.
I can access my loadPercent TextField from my MainClass
I get three '#1120 access of undefined propery' errors for each time i try to access loadPercent.
a few basic questions: 1. all my files are in a folder in my documents, not in the flash directory, is this bad? I've seen people using com.whatever etc.
2. my main .fla file does not share the same name as my MainClass.as (it's not named MainClass.fla) Is that a problem?
I'm assuming these are inconsequential because my code seems to work up to a certain point.
On the stage I have a movieclip called mc_back. I also have a movieclip on the stage called mc_content. Now, inside mc_content I have a bunch of code and some of it adds, or should add, an EventListener to mc_back as well as a a function that works when mc_back is pressed.
So basically, all code is written inside mc_content and some of it needs to interact with mc_back.
how to target mc_back from inside mc_content. Using stage.mc_back or root.mc_back doesn't work and Google should be my friend, but in this particular problem, it's acting more like my enemy.
I'm slightly new to Flash CS3 + AS3 combo, so its more of a lack of practice question. My question stems from the problem described here http:[url].... . Note, its not the same problem, its a new one.The Problem ,So I have multiple library assets (which are on teh stage) and I want to assign similar functionality to all of them.
Attempt 1: So I create the n assets, create a custom class in AS3, link them to Flash CS3 and obviously enough it gives me the error that multiple assets can't be linked to the same class.Obvious enough to understand (well not completely, because from a programmers background it doesn't make sense).
Attempt 2: Same as attempt 1, but instead of linking all the assets to the same class I make the base class the same class, and let the derived class be dynamically created by Flash on compile time.So the linking works, but the problem is, in my base class I have a method which does something (say an tween) on a child of the library asset. So if the assets on the stage/library are called asset1, asset2, asset3 (same name for asset name, class name, id name), each of them has a sub-movieclip called ... say 'foo'. now if I manually wrote a class for each asset, I could do 'this.foo' to play with the sub-movieclip. However since this functionality is in the parent class, I'm unable to do it.
P.S. If you're form a programming/OOP background, its basically a abstract class problem. My Base class knows how to doSomething(), but it needs aSomething, which is defined in the Derived classes. However I found out that AS3 classes don't support virtual(C++ )/abstract (Java) in the true sense of the word (unless I missed some obvious documentation).
How to access a display object on the stage in a class which is not a document class?
I am looking for a solution that doesn't involve passing the stage as a parameter to the class.
One solution i always come across is using "TopLevel.as". Is it a good method because as far as I have heard using global variables is not recommended because it might cause some problems while working on big projects.
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?
I have created a class, call it Class1, that has various objects drawn on the stage (drawn in the IDE). It also has a function, called setColour, for changing the colour of those objects. The function works fine if I call it from within Class1.
Now I have another class, call it testClass1, that imports Class1 and calls the setColour function. First of all, none of the stage objects from Class1 are visible. Secondly, when setColour tries to modify the colour of an object, I get the error:
TypeError: Error #1009: Cannot access a property or method of a null object reference.
I'm being really dumb today and I know this should be simple.....How do i access the stage from a class which isn't the Document Class? For instance, I want to create a tween which takes in the parameters of the stage's width? So I've written.....
ActionScript Code: var myTweenX:Tween = new Tween(this, "x", Regular.easeOut, this.x, stage.stageWidth, 60, true);
I coming from an AS2 environment and trying to get my head around AS3.I have a dynamic Textfield on stage (instance name tfval)a movieclip named mcPlan, this contains a btn called s4.[code]
