What I get is that you can pass a function to another function as an argument so that the function that you pass to can "call back" that particular function.
All good. However, I'm unclear about a couple things: Why exactly is this beneficial? is this the same thing that the addListenerEvent method does when you pass it a function as an argument for when the event fires?
My as3 code ( build in cs5 osX 10.6 ) doesn't work in flash cs5 osX 10.7!
When I store a callback function in a parent class variable the refrence is weak and no more avaiable for other calls!
exemple:
parent class:
-----------------------------
public class Foo
{
protected var _fct:Function;
}
[Code]....
There are several built-in callback functions in Flash, all of them very useful because they are monitoring events and immediately execute actions. They made us economy in code writings. Unfortunately, there's not enough callback functions that fulfill our particular requirements. For example, there's not such a MovieClip.onFrameReached(n) function, that makes something when the movie clip reaches the frame number n. I must appeal to setInterval function to monitor when the movie clip reach the frame n. I try to avoid using that because I believe it is resource consuming. In ActionScript 2.0, can you create your own callback functions or methods? think about what useful a function I described would be when you work with external swf's in order to synchronize it with other objects.
View 3 RepliesI am currently doing something like this:
myFunc(tracer);
function tracer(message:String):void{
trace(message);[code]........
Now, this works fine. But how can the function myFunc know, if the given callback function accepts the correct number and type of arguments in its signature?I want to avoid that I call something like this somewhere in my code:
myFunc(tracer2);
function tracer2():void{
trace("done");[code]..........
Is there a way to do something like this, in order to use compiler warnings/error messages and thus avoid exceptions at runtime?
// Won't work :-(
function myFunc(callback(message:String):Function):{
callback("Hello");
}
Im trying to load some data, but I want to outsource the job of data loading to different classes.lets say XMLLoader class will get the url and return an xml file. The problem now is that such procedures are asynchronous, the class has to wait for XML to load and then call back the caller class and return the xml data.One way of doing this, is returning the data with a custom event. once its loaded then dispatch this event with the data in. However, I was wondering, if there is a way to do it with some sort of asynch call, meaning the caller class sends the request, then waits for a response.is such a thing possible? is there a better way or do I need to stick to my custom events?
View 2 Replies(How) is it possible to catch an error thrown in a callback function like onConnect of the XMLSocket object?
Code:
var s:XMLSocket = new XMLSocket();
// Will not catch error :-(
try {
[Code]....
(How) is it possible to catch an error thrown in a callback function like onConnect of the XMLSocket object?
Code:
var s:XMLSocket = new XMLSocket();
// Will not catch error
try {
s.onConnect = function(success) {
trace(success);
throw new Error("Unable to connect");
trace("Won't trace, error thrown"); }
s.connect("127.0.0.1",1024); }
catch(e:Error) {
trace(e) }
Been doing some actionscript magic lately, done a nice interpolator class. The class, whenever an update occurs, calls a previously specified callback function. Normally, setting a variable of funCallback:Function and calling it works fine. However when I wanted to specify an *object's method* as the callback for the interpolator, it apparently called it as if it would be a static method.
And it isn't.What I need to do, simply speaking, is to be able to call an object's public method, having just th object's reference and function name, just like the second variant of setInterval does ( the one having "object, string" as the first two params, not "function").
fileReference.addEventListener(Event.COMPLETE, uploadCompleteHandler);
private function uploadCompleteHandler(event:Event):void {}
Above is one way to add an event listener in Actionscript. By default the callback function needs to have an argument with name event and type Event. Is there a way to declare this function without any arguments :
private function uploadCompleteHandler():void {}
Edit : It's possible to add an event handler without any arguments in mxml. So one student wanted to know, why isn't it possible to do the same in actionscript?
How do I execute callback functions dynamically by passing a function in as an argument to another function?
Look at this example:
Code:
package {
public class myClass extends MovieClip {
public function myClass(callback) {
[code]....
I read a lot about accessors or getters/setters, but to date I cannot really understand what they do. The language describing their use is just beyond my comprehension, not being any type of developer nor an advanced AS3 user.Can someone provide, or point me in the direction of, a VERY SIMPLE getter/setter example that includes WHY it would be used as well as HOW to use it? something small that doesn't use just comments within functions (like "// here is where you do xyz"), but actual code (the actual doing of xyz). That way if I want to play with it and build on it I can.
View 14 RepliesFor example, I have a function that is triggered by a button click This function loads an external swf.I then set a global variable swfLoaded to true, with the idea of having an if condition that executes removeChild(loader) if swfLoaded is true.When trying to execute removeChild(loader), I get an error telling me that it must be the child of the caller.I've seen the code below, which loads a default swf, but I don't want a default swf - I just want one loaded if the button is clicked, and then if another button is clicked, the original one to be removed before the next swf is loaded.How do I make this code work without loading a default swf, just loading one once someone clicks a button, and then removing it?
var Xpos:Number = 110;var Ypos:Number = 180;var swf:MovieClip;var loader:Loader = new Loader();
var defaultSWF:URLRequest = new URLRequest("swfs/eyesClosed.swf");
[code].....
I have been reading Learning Actionscript 3.0 for about 1-2 months now on and off and i have stumbled across a paragraph that I don't quite understand concerning the position of a navigation bar buttons.
Code:
var btnNum:int = 5;
var spacing:Number = 10;
var navBar:Sprite = new Sprite();
addChild(navBar);
var btn:SimpleButton;
[Code] .....
The current button is positioned horizontally (line 10), offset by the spacing set in line 2, plus the width of the button and another spacing gap for each button in the loop. Therefore, the first button is positioned only 10 pixels to the right of the container's registration point (spacing, plus zero times the sum of the width of the button and spacing). The last button is positioned 10 pixels to the right of the container's registration point plus 4 times the width of the button and spacing. The vertical position is also set, moving the button down 5 pixels. From the above quote, I understand that the button the first button is placed horizontally, but i don't understand what is after it. What the paragraph means and how it does it's position.
people I am a newbie here, I need help and explanation in making a scrollbar like the one in[URL]... I know a slider and a textbox is needed but I need to know the trick behind it.
View 1 RepliesI just can't seem to figure out how to use them and what they're used for.
View 2 RepliesI'm a relative noobie struggling to understand object registration points / center points. For example, in this image of an empty movie clip from an XML gallery I'm customizing for my site, there is a circle with a cross and an empty circle.
Can someone point me to a thread or article that explains object registration points, how they relate to each other and how (and why) to move them (or not)?
I try to understand this code ( taken from a tuto). I am learning empty mc and AS... I catch it until a certain point, however some terms are still very very dark for me :So as far I see, there are only 2 objects in the file :An empty mc called Menuholder and a mc called menuitem ( a picture for example)I can track back those 2 objects in the code, however I can not understand what is the object "menu" doing there ???I highlighted it bellow your explanation :align = bottom;centerx = Stage.width/2;width/2;menuitems[i]._x = xpos;}};
View 4 RepliesI was curious to how gotoAndStop really functioned, so I ran a few tests. Results are highlighted for easy skim reading.On each frame, I placed a trace statement, saying which frame is currently displaying.Then, I messed around putting different kinds of code on frame 1.
Example #1
Code:
stop();
gotoAndStop(5);
[code]....
I have a series of calculations i'm doing over a bunch of objects stored in a array. Each function is pretty CPU demanding but if you only run one function, it just works fine.
[Code]...
I've got a project thats getting a bit big, so Im taking the actionscript out into separate as files. I want all the basic functions to be in BasicFunctions.as and the make a library for more specific functions. I find that a lot of people use the import statement but I cant get that to work with a simple Hello World trace, yet the include statement works fine (see attached). I understand that import/include work differently, but which is the better method? If import, then is that heavier to work with. Any rate, what's the best way to organise code when it gets to the 1000+ lines?
[Code]....
I'm trying to find a way to have global functions in my as project, similar to how flash does with stuff like the util functions (describeType()...), where you can just call the function wherever you need it. For example:
[Code]...
So when I call Test(), it prints out "hello world" fine. My problem comes in that I can't change the name of the Test function, and I can't add any other functions without compiler errors. Is it possible to have a load of global functions in one file, or do I have to split them up into separate files like in the example? Also, I know that I can make a Global class and call static functions like Code: Global.doSomething() but I'd like to know if there's a way to do it as flash does it (describeType(), getDefinitionByName(), etc), or rather, how does flash do it?
Is it not possible to call other functions from generic mouse event functions?
Code:
_root.myButton.onPress = function(){
hide();
[code]......
I have one function that puts text in a text field and makes a button goto a url onRelease.The code is like this:
Code:
item.onRelease = function() {
myButton.onRelease = function() {
getURL("http://google.com", "_blank");
}
talk = this.txt;
}
the only problem is that the button doesn't work onRelease. i think that it is because there are too many functions there, but at the same time,
in this example why the values of (12) and (21,39) are lost at the geo and geo1 functions
[code]...
I am integrating a flash module with Drupal using XMLRPC module. I am currently calling a node.save on Drupal(which creates a page in drupal), using Actionscript 2.0. On a flash button click, I am currently calling the node.save function. But ideally, I would like the function to be called first and only after the success of node.save, forward to the confirmation url. Right now, I am being forwarded to the page even without node.save being completed. I then have to refresh the page in order to see the results.
[Code]...
how to write a callback instead of using an event to communicate between two classes (objects) in Actionscript 3.0?
View 2 RepliesI am trying to write an IF Else statement that will check to see if a movieclip on the stage has an external SWF loaded in it that was loaded using the loadMovie command. Does the loadMovie command or the internal movieclip object have any kind of a built in function that will return a value if it has an external SWF loaded in it?
View 1 Repliesi made an example so i can explein the prob better.[code]I am making a class and if have another build in object in it. I what to add a callback to it but the inheritance is not right. I know how the set up inheritance
1) subClass.prototype.__proto__ = superClass.prototype;
2) subClass.prototype. = new superClass;
but its all messed up in my head so I was hoping someone could point me in the right direction on how to get the callback to work with out messing up the LoadVars class too much
Im adding lot of simple functions to prototypes of top level objects ( Object , Array , String ...) and have 2 questions :
Is possible to add functions to top level's classes in compile-time ?
If not , is there a way to allow this functions to compile ? I dont like to turn off strict mode
ex:
string.removeWhiteSpace();
string.sliceStr("." , "end");
textField.scrollBottom();
this return compile-time error , cause there is no such function , i have to write it in braces :
string["removeWhiteSpace"]();
string["sliceStr"]("." , "end");
textField["scrollBottom"]();
and i like to aviod it )
Is it not possible to call other functions from generic mouse event functions? Surely it is !!??ie....
Code:
_root.myButton.onPress = function(){
hide();
[code]........