ActionScript 3.0 :: RemoveEventListener() For An Anonymous Function?
Jan 31, 2008
I have an event listener with an anonymous function literal, rather than a function reference. What I am trying to figure out is how to remove that event listener.Obviously, I need a reference to the anonymous function, so the two functions are ===. But, something is going wrong... it just doesn't work, ad this situation doesn't generate any feedback to tell me what might be wrong.There is some good info here, but not a clear explanation.
Code:
private static var _myFunc:Function;
public static function addCreditsToolTip(clip:DisplayObject):void
[code].....
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Aug 4, 2010
In as3, I am adding event listener and then attaching the anonymous function to it:[code]Now this whole piece of code is looped n times. Now, I have n myBoxes and whenever I roll my mouse over the box, it should alert the name. But, what I see is that the last value of count is used by each box. How can I pass parameter or value to the anonymous function? ( as roll over , I believe, expects only one variable)
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Aug 23, 2007
little bit what Im trying to do: I have 2 SWF, one.swf and two.swf 1 LocalConnection to send 1 variable from one.swf to two.swf
one.swf code:
var param:Number = new Number(5);
var sending_lc:LocalConnection = new LocalConnection();
sending_lc.send("_Connection1", "myMethod", param);
[code]...
I need to be able to use param value out of the function, because a I need to perform a switch with this value, since the function wich receives de param value is an anonymous function I dont know how to do to get the value from outside the function because a dont have a reference name to the function so, the normal way to return a value is not going to do the job.
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Apr 20, 2009
I am trying to play an MP3 File in Flash Lite 2.1 (I'm using Flash 8 to develop it). The filename of the MP3 file is imported from an XML file.Here is a copy and paste from the help file on how to do this:
// create a new Sound object
var my_sound:Sound = new Sound();
// If the sound loads, play it; if not, trace failure loading.
my_sound.onLoad = function(success:Boolean) {
[code]....
When I test this code on its own, it does work fine for me. However, I want the above to be executed inside a function that does a number of other things...
Here is a sample of what I'm trying to get working.
function myMusic() {
// create a new Sound object
var my_sound:Sound = new Sound();
// If the sound loads, play it; if not, trace failure loading.
[code]....
I think it's got to do with the fact that once I put it inside a function you are nesting functions (there is a function call from the onLoad event).
I tried changed the line:
my_sound.onLoad=function(success: Boolean) {
to
my_sound.onLoad=myFunctionName(parameters go here)
and then I created a funciton called myFunctionName but I wasn't sure how to send the sound object or what parameters the function should have or how to get the .start() method to work inside the new function.
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Jan 6, 2010
up.addEventListener(MouseEvent.CLICK,
function clickFunc(event:MouseEvent):void
{
revealSpinner(event,51.42,1,spinner);
[Code].....
The above code adds a listener to a couple of MC's. Originally the methods were anonymous but I have named them clickFunc() in order to try an reference them in my remove listener.
Here is my remove listener code. Both of these snippets are in separate functions. The add listener method is called before the remove method.
up.removeEventListener(MouseEvent.CLICK, clickFunc );
down.removeEventListener(MouseEvent.CLICK, clickFunc);
As soon as I publish the movie I get this error:
1120: Access of undefined property clickFunc.
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Feb 14, 2010
If I want to send an object to a function with one child called foo equals "bar", i need to do the following:[code]is there a way to declare the object in the function itself ? something like that:[code]
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Aug 26, 2010
Getter functions allow obj.meth syntax instead of obj.meth(), I'd like to create an anonymous one of these to return from another function. function get ():Object { } is invalid syntax. I don't suppose Flex offers an easy way to get this functionality, if it's even possible?
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Mar 8, 2011
I'm trying to differentiate anonymous functions like:
function() { trace("WOO"); }
from the other ones ('named'?) like
var _FUNC:Dynamic = function() { trace("WOO"); }
The reason I want to do that is because I can't compare between two anonymous functions, because they are two different ones.
var _TEST:Dynamic = function(a:Dynamic):String {
var _TESTA:Dynamic = function() { trace("WOO"); };
var _TESTB:Dynamic = _FUNC;
return (a == _TESTA) + ", " + (a == _TESTB);
}
If I run _TEST(_FUNC);, I'll get back "false, true". Even though they are the same function, they are NOT the same object.Is there a way to compare those such that functions that they are the same if they perform the same task? Is there a way to serialize functions? So that maybe I can compare the serialized representations and see if they share the same 'code'.
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Jun 20, 2011
In c++ if I have a function that takes a class I have defined elsewhere as a parameter like so:void moveto(CPoint2D point) { ... }I can invoke it and pass along data to it like this:moveto(CPoint2D(0,0));basically creating the object and invoking it's constructor to be passed to the functionIs there an equivalent to this in AS3?if I have a function like this:function initialize(min:Point, max:Point): void { ... }how do I do something along the lines of :initialize(Point(0,0), Point(10,10))This throws an error im assuming because it thinks I want to cast something to a point and the notation I found earlier to do something similar only seemed to work if using the basic Object class.
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Jan 5, 2010
I need to disable an onClick action until an animation has stopped. Animations can be started by 4 different buttons - all need to be deactivated.I use a listener to pass params to the function that will initiate the animation which is why I use an anonymous function in the add listener:
up.addEventListener(MouseEvent.CLICK,
function(event:MouseEvent):void
{ [code]............
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Sep 16, 2009
Code:
var abc:Number = 0
btn.visible = true
btn.buttonMode = true
btn.useHandCursor = true
btn.addEventListener("click", buildIron())
[Code] .....
I tried this code but it didn't remove the event listener.
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Jun 25, 2009
One can easily remove a listener like so: circle.removeEventListener(MouseEvent.CLICK, maskSquare); BUT, is it possible to remove a listener (or preferable ALL listeners) from an object WITHOUT knowing the function that the event is tied to?[code]
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Mar 24, 2010
Example:
Code:
var btn:Sprite = new Sprite();
btn.graphics.beginFill(0x000);
[Code].....
Problem: Since I used a blank function(){} inside of the Listener, I don't know how to later delete that function from that object (btn);
Is it possible? Or is there another way to pass variables while defining Listeners on objects?
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Oct 22, 2011
Why isn't this working as I am thinking it would:
var i:int=-1;
for each(obj in myData)
{
i++;
[Code]....
If I add i to an array (like myArr.push(i)) it will have 3 elements, 0, 1 and 2.
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Aug 1, 2009
import flash.display.StageScaleMode;import flash.display.StageAlign;stage.scaleMode = StageScaleMode.NO_SCALE;function loading2(e:Event):void [code]......
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Aug 1, 2009
First time I'm having this error, I've created different MC in a for loop in a public function.Then I need to access these MC for mouseOver / mouseOut functions, and I get this error 1006. I guess I have something undefined or a problem with Array but I can't see what I'm doing wrong.Here is my code so far :
Code:
for (var i:int = 0; i <linkNames.length; i++) {
var link:MovieClip = new MovieClip();
[code].....
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Apr 20, 2011
I'm new to AS3, and can't figure out why this loop isn't behaving the way it "should."
[Code]...
How can I give each anonymous function a reference to each object represented by f, rather than a simple reference to f each time? Specifically, why is it that each copy of the anonymous function gets bound to a single reference to f? How (I should say why) exactly does AS3 differ from JavaScript in this regard?
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Aug 16, 2010
I have a button labeled 'blueButton' and I'd like to use an anonymous function to handle the click, like so:
blueButton.addEventListener(MouseEvent.CLICK, function(event:MouseEvent):void {
trace( "-----click detected-----" );
// now do other stuff
});
Problem is, the click handler is called multiple times per click. The number of times called seems to be random (sometimes 2, sometimes 4, sometimes 3 etc). could I be missing something in my code, or maybe I set up the button wrong?
also I noticed that it seems to always get called once on the first click. After the first click is when it starts getting called additional times, maybe that has something to do with it?
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Nov 4, 2010
I need to get a javascript var in my Flash application. I like to be able to just set a variable in the javascript (client constraints) rather than define a function.
Can this be done? I am trying to use the ExternalInterface.call()
AS:
ExternalInterface.call("function(){return window.someVar}", null);
JS:
var someVar = "Test";
This does not work and I suspect it is because the ExternalInterface.call() does not like the anonymous function.
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Jul 3, 2010
I noticed that in anonymous event handler this is referenced to global, not my class. I know that I can use outer referenced variables (because it creates closures), but how to get right this context?
Simple example:
_movieClipClassVariable = new MyCustomSpriteSubclass();
_movieClipClassVariable.addEventListener(MouseEvent.CLICK, function(event:Event):void {
trace(this); //gives 'global'
});
What about memory usage and garbage collection objects with anonymous handlers? Is declaring handlers as class method better?
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Dec 12, 2010
I came to AS3 from JS world, and I should confess that anonymous functions are my weakness. I tend to use them everywhere. Now, coming to AS3 I've heard and read in lots of places, that AS and Flash are enormously bad at handling garbage collection, that one should empty, dispose and remove all event handlers and objects manually to avoid weird and unexplainable memory leaks and crashes. Not sure what part of this is true, but I would like to follow best practices right from the beginning. How bad is idea of using anonymous functions as event handlers? Consider for example a code like this:
addEventListener(Event.ENTER_FRAME, function() : void {
controls.elapsed = stream.time;
});
Ccontorls.elapsed is the setter, which apart from setting current play time for video player, updates the whole UI, and stream is NetStream object, which streams the actual video. There are lot's of other places where anonymous function may make code cleaner and more intuitive. Check the following code for simple fade-in effect for the control bar:
public function showControls() : void {
var self:Controls = this;
if (!visible) {
visible = true;
fadeTimer = new Timer(30, 10);
[Code] .....
I totally like how it looks and fits into the code, but I'm concerned about leaks. While Event.ENTER_FRAME handler probably would never become harmful in this form, what about timer listeners. Should I remove those listeners manually, or they will be removed automatically, as soon as I set fadeTimer = null ? Is it possible to remove listeners with anonymous functions properly at all?
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May 25, 2007
Why can't I execute an anonymous function directly, like:[code]The trace statement should output 'hello', but it just outputs 'undefined'. This is supposed to work in JavaScript (according to Mr Douglas Crockford). I thought Actionscript was compatible with JavaScript in this regard...
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Dec 25, 2010
I want to make in loop set of buttons, and add to them some events, but anonymous functions is the same. I write example code:
for(var i:int=0;i<5;i++)
{
var button:SimpleButton = new SimpleButton(...);
...
[Code]....
And I want to trace 0,1,2,3.. from click buttons instead of 4,4,4,4 ..
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Sep 15, 2010
If an object, or say... a document class, creates an instance of a class (and stores it as a variable), and it doesn't pass any arguments to the constructor of the class, can that class object, by simply having a function of it called by the parent, tell who sent it that command/request? In other words, can a class object know who called it (such as it's parent) via a (seemingly) anonymous call?
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Feb 7, 2010
I have made the flash file into CS3 and simplified the idea a bit. Basically I want to click the box on the right to start playing the song and the spectrum and then if I click it again it will stop playing the song and the spectrum then if I click it again it will start playing again ect ect. I could not upload the song.mp3 cause the file size was too big you will have to replace it with another mp3 in the root of the folder and name the mp3 song.mp3.
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May 12, 2009
I have an arbitrary number of files that I need to load in an AIR app.I want to iterate through an array of File object and create and launch Loaders for each one's File.url.When they are done (event COMPLETED or IOErrorEvent.IO_ERROR), I want to stuff their data somewhere. If they fail, I want to make an exception report. I cannot find any way to reference the File object from the event listener (certainly not the IO_ERROR)The best way would be to create individual event handlers for each Launcher that had the File information "hard-coded" into it. At the very least, I could use the function itself as an index to a Dictionary:
foo(fileToLoad : File) : void
{
var theCompletedHandler : Function =
{
[code]....
Can I use event.currentTaget and use the Loader instance as an index? Will that have any weird dependencies ?
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Jul 1, 2011
In below script i wanna get the trace output in first click, in second click it should not work. i am using removeEventlIstener. don't use other ideas... use removeEventListener.
Actionscript Code:
stage.addEventListener(MouseEvent.CLICK, first_clk);function first_clk(MouseEvent){ trace("clicked on the stage") stage.removeEventListener(MouseEvent.CLICK, first_clk);}
[code].....
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Apr 27, 2010
I'm having issues removing event listeners once they're added in cs4 jsfl. I tested the same code on cs3 and it removes the listener just fine without errors. In CS4 if I try:fl.removeEventListener("mouseMove", movieclipListener);I get the error:removeEventListener: Argument number 2 is invalid. If I try:fl.removeEventListener("mouseMove");I get the error:Wrong number of arguments passed to function "removeEventListener".
So I'm summarizing that: - the removeEventListener has changed between versions cs3 and cs4- Neither method works in removing my event listener Tried running this in the same script that added the event listener (same script that contains the function called), tried running in a separate script. Same errors.
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Dec 31, 2010
In a class called Rebound in my constructor I have this addEventListener:this.addEventListener(MouseEvent.MOUSE_UP, selecting); Then in another class called Grid I have a public function called placerIn placer I want to remove the event listener for selecting in the Rebound classBoth the classes extend movieclip and are linked to different movieclips.
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Feb 8, 2011
This is driving me crazy. Why don't the removeEventListeners work?Class constructor
public function item(brand:String, title:String, price:Number, mp:Number,
path:String, sb1:*, sb2:*):void
sb1:* and sb2:* are object hooks.
[code]......
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