Actionscript 3 :: Not Understanding Basics Of Dynamic DataBinding (bindPropety) In Flex
Jun 6, 2010
I need to dynamically bind properties of components created at runtime. In this particular case please assume I need to use bindProperty. I don't quite understand why the following simplistic test is failing (see code). When I click the button, the label text does not change. I realize that there are simpler ways to go about this particular example using traditional non-dynamic binding, but I need to understand it in terms of using bindProperty.
[Code]...
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Apr 15, 2011
I started out learning AS3 on my own a while ago without any programming experience whatsoever. I'm still in my diapers, but slowly progressing. Currently I'm working on a short animation with some code involved. Part of the animation is a herd of cows grazing in a pasture. I have a class called Cow which extends MovieClip and on the Cow timeline I have the walk cycle and other cow movements animated. When a cow is walking it slowly moves horizontally, along the x axis. I want the cows, when walking to also randomly move up and down (along the y axis) which would basically look as though the cow is moving further away or moving closer towards us. I'll be resizing each cow, according to its y position to create the effect of perspective (near and far).
What I'm trying to figure out is how to make the cow move either up or down the y axis in a somewhat random way. By "somewhat random" I mean that I don't want the cow to switch directions every second, but rather something like: 5 seconds moving up the y axis, then maybe 8 seconds moving down, then possibly 4 up, then 11 down, etc. It would be super if I could also have a velocity factor involved, meaning that when changing directions - from up to down, or down to up - I prefer that the change is smooth, like as in a ease out and then ease in.
[Code]...
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Mar 14, 2011
I have a small question. I am probably misunderstanding something, but when I do :
[Code]....
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Aug 14, 2010
When the Flex SDK converts MXML to actionscript it generates a lot of databinding code. I don't want to bind a variable, for example if I know the variable will not change.
I can't seem to find a work around in Flex to disable the autogenerated databinding. Also, I was hoping this might also help with some of the runtime warnings thrown by databinding. To get around them, I sometimes use the following, which only throws syntax warnings (and don't appear in my console at runtime).
Syntax warning: Data binding will not be able to detect changes when using square bracket operator.
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Mar 23, 2011
this is my sample code
var i:Number = new Number();
trace("showarray length" + showArray.length);
for(i=0;i<showArray.length;i++){[code].....
wherenever the if is satisfied it stops looping it immediately goes out of the loop.this is a sample output given that the length of showArray is 2 and num = 0
showarray length2
equal daw0==0
alerts
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Mar 5, 2012
the new TextInput component which uses stagetext on 4.6 has this issue where if you bind a variable on it e.g
view1...
and i push a new view e.g view2, and pop it, hence reloading view1. on initial load, I can see that the textinput display the variable abruptly then the text vanishes afterwards..
I'd like to note that the variable is a stored data, and can be access on any view.
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Jun 14, 2010
The help page on the BindUtils.bindProperty function:url...Has this to say:"For example, to bind the property host.a.b.c, call the method as: bindProperty(host, ["a","b","c"], ...)." But what if I need to bind to host.a.b[2].c? How do I do that?
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Sep 28, 2010
I have an arrayCollection with strings in them, is there some way I can databind a RadioButtonGroup to the array collection? As we can do for combo boxes [code]There is no RadioButtonGroup.dataprovider property.
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Mar 27, 2011
I've been trying out Flash Builder for the first time and I can't seem to get it working...
First off I have these bits of very basic code:
[Code]...
Another key problem: Flash Builder cannot connect to the debugger, even though I've installed it twice now.Can anyone help me here? I've made sure my firewall is off, but could this be causing problems?
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Jan 23, 2010
well, I have a combobox which I have bind his selectedItem property to a value object object, like this
<fx:Binding source="styles_cb.selectedItem.toString()" destination="_uniform.style"/>
<fx:Declarations>
<fx:XML id="config_xml" xmlns="" source="config.xml" />
<!-- Place non-visual elements (e.g., services, value objects) here -->
</fx:Declarations>
<mx:ComboBox x="66.15" y="63.85" editable="false" id="styles_cb" dataProvider="{config_xml.styles.style}" />
the value object is a custom class with some setters and getters, and I want to set a property based of the value of the selectedItem of the combo, so inside the value object I have something like this
[Bindable]
public function set style(value:String):void
{
_style = value;
trace(value);
}
my problem is that each time I change the combobox selection which in fact change the style property of the value object it does it 3 times, if I trace the value of the setter it actually do the trace 3 times, why?? how can I avoid this? I'm doing something wrong? or there is a better way to do it,
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May 27, 2009
I have creating a distributed note taking application in flex, it basically is a notepad I can keep in my desktop tray. When I add notes and goes back to a server and saves it in a database.
To am struggling to design the application correctly, I want to have a Syncing service that polls the webserver for changes and updates an Array of Note objects. The problem is that my note corresponds mxml component, aka SingleNote component. There are four different cases when being, a. a note is updated from the server poll, in that case I want to singlenote to update the settings b. a note is added to the array from the server, in that case a new SingleNote needs to be created c. a SingleNote is added from client, in that case a Note is added to array, and sent back to server d. a SingleNote is change from client, in that case the Note is updated in the array and sent back to server
The properties are SingleNote(Width, X, Y, Text).
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May 22, 2008
well, I have a combobox which I have bind his selectedItem property to a value object object, like this
<fx:Binding source="styles_cb.selectedItem.toString()" destination="_uniform.style"/>
<fx:Declarations>
<fx:XML id="config_xml" xmlns="" source="config.xml" />
[code].....
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Oct 20, 2009
I have 2 questions about remote shared objects in Flex/ActionScript3:1) If I connect to a remote shared objects, but do not handle the SYNC event, will the shared object still receive data from the server? ie. will the server still broadcast data to this client ? This is what I expect
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Sep 3, 2009
I'm trying to set up a form that presents a combobox when an ArrayCollection it's bound to has several items, and doesn't present one when it's empty or only has one item. I've tried doing this by creating this class, but unfortunately, the data provider I've bound to is never not empty at the time the setter executes.
public class ComboboxOrFail extends ComboBox
{
public function ComboboxOrFail()
{
[code]....
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Mar 25, 2010
I am trying to understand what is going on in a SWC that I am importing from Flash CS4 into Flex Builder 3. Specifically I am using a SWC supplied by a Designer as the animation for a custom preloader (a subclassed DownloadProgressBar).The issue I am trying to understand is, once the FlexEvent.INIT_COMPLETE is fired, I cleanup by removing the swc by running this [code]though even after I have removed this (which is successful, as I have checked by comparing this.numChildren before and after the call) the key framed animation still continues to run (not visibly). This has been detected by the Designer placing a trace in the time line of the animation (in Flash). Can anyone tell me why is it, that even after I have removed the animation from the subclassed DownloadProgressBar, it still keeps running ? Also, is it standard practice when importing SWCs to manage the cleanup of resources from the Flash side of things (much like releasing memory in obj-c). I find it counter intuitive that removing the child from the Flex side does not stop the animation.
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Jul 31, 2009
In my Main application I used label (like id=firstname) so we can use in main used firstname.text for databinding. But I have created canves custom component and load in main application using viewstack.In canves custom component how can I Bind label(id=firstname).I tried:var username:string = firstname.text but not show undefine firstname.How can I access all label and component in Main application to custom application.
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Jan 14, 2012
I was wondering if it could be possible to create a databinding system in pure actionscript without using mx.binding.utils At least I would like to know what is the overhead of the databinding code and how exactly the ChangeWatcher knows when a property has been changed.
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Jan 19, 2011
I'm trying to make flash animations w/ text. I don't know how to make buttons though so I can advance the movie. I really have NO idea so I need details on EVERYTHING past opening up a new as3 document.
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Jul 27, 2004
I am only at the very beginning and I want to make certain that I go through this understanding everything that can so maybe I won't have to ask as many questions in the forums and can start answering more. In this part:The code for making a standard generic object in Flash is as follows:
myObject = new Object();
The variable myObject then becomes a object variable which can then have more variables added to it using dot syntax like so.Is myObject the actual name of the variable and the = new Object simply stating that there is a new object called myObject?
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May 27, 2011
I'm trying to get to grips with having a function that can accept an input that is passed to it as it is called, and then use that input in its workings.As I'm writing more code, it's becoming clear that this is something that I need to pick up, but despite reading and playing about with it, I'm still a little confused.The code is designed for a character's "level up" screen. When the button next to a stat is pressed, I want it to pass the name of that stat to the statUp function, which will increase the selected stat by one.In my main file I have this code, to call the function when the button is pressed. (In this example, it is the Strength button)
ActionScript Code:
_root.buttonStr.onPress = function()
{
[code]........
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Mar 17, 2009
I was pretty good at 2.0 but 3.0 has completely lost me. I've been reading up on it and getting a handle on it, but in the entire Actionscript 3 BIBLE I have not been able to figure out the simplest, key part that links it all together. How, in the name of everything that's holy, do I communicate between the stage and the "ever-necessary, more secure, more robust" AS files I'm creating? I wish I could give specific code, but I'm just looking for the guideline. If I create a function in a class, I can't call it in the timeline or a button, or even a line down from it in the AS file (call to possibly undefined method).
If I create a sprite in my AS file and then try to add it to the stage, addChild is an undefined method or function. If I create a movie clip in flash, export it for actionscript, it's undefined in my AS file. Just show me how I can write a super simple program where the thing on the STAGE interacts with the thing in the AS file, and I can take it from there.
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Jun 24, 2010
What I have is a class with static properties that I want to use as images. I would like the images to be configurable at run time but still have the defaults. So the Images class looks like:
[Code]...
Clicking the button will change the static property in the Images class to something else. The image defined in the MXML will get the binding event and update the image, but the custom component created in ActionSctipt will not be updated.
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Mar 17, 2008
Is there a way to modify this tutorial to execute selectedItem on ROLL_OVER instead of click? I changed
lb.addEventListener(Event.CHANGE,itemChange);
to
lb.addEventListener(MouseEvent.ROLL_OVER, itemChange);
but when I rollover a list item I get: TypeError: Error #1009: Cannot access a property or method of a null object reference. at as3xml_finished_fla::MainTimeline/itemChange()
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Feb 17, 2009
I've just been following the Basics of Papervision3D tut, which is very good by the way, the only one I've ever managed to get working.And I'd like to write the code as a separate as file, but I'm having a bit of trouble.In the class definition, what should it extend?[code]I tried everything I can think of and looked at other tuts to see what they've done but nothing works.
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Apr 11, 2009
I've been trying all day to get the Papervision3D Collada Basics tutorial to work and every time I run the file I end up with an empty black screen. No matter what I've tried i cannot get anything to show up. Finally I had the idea to download the source files from the tutorial and run those 'as is' without changing anything. When I opened the SWF created by Lee, all i saw was the same blank black screen. Has anyone else run into this? All other Flash files seem to be fine,
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Mar 9, 2004
I've been reading through all the various threads related to the drawing API and saving drawings. About a hundred times I've seen mention of "log mouse positions into an array" and stuff like that, but I can't find any clear and simple examples of how to do this.
Let's take a very simple use of the drawing object to do freeform drawing. What is the AS to capture the mouse XYs as the user draws and put that into an array. I can't figure out how to get Flash to keep updating things as I go, it invariably grabs the fist point and that's it. Could one of you AS gods just write out a super simple routine for this? I know I'm not the only one that needs this (as it seems to be asked every week) Let's use the most basic drawing example I can find:
[Code]...
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Oct 21, 2011
This may be a bit of an easy question for some, but I'm having difficulty understanding what mc.name.slice(5,9) does. What is this name slice bit about?
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Jul 20, 2010
I have a bit of Flash experience, did a full featured movie player, other stuff in AS3 and got plenty of programming skills in other languages, BUT now I need to create a multi paged website. Quite easy, a few pages, some animations here and there, nothing fancy, got all the graphics.
But time is short on this one, so I need some advice about good practices (pack everything into one main MC or make separate swfs and load them in, etc.), where to begin, or what kind of book should I grab to make the job pretty.
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Mar 25, 2009
How come every time I run this script:[code]Where does the Undefined come into things? I have only asked the script to fire 3 times so the first time through the text in position [0] in the script Carp should be printed out?
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Sep 19, 2011
One of my testers is asking me about an AMF polling that we do in our app:[code]They are seeing values of 0 and 5.
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