Actionscript 3 :: Declaring An Optional Argument Of Type Int And Testing Its Existence?
Aug 6, 2011
In ActionScript 3 you can declare optional parameters like this:function (i:int = 0, s:String = "", o:Object = null):void { }So you can check if the user passed parameters s and o because you can test against the empty string or the null object if(s && o)...But how do you allow an int to be truly optional? What if all values for i are valid, including 0, negative and positive integers? And what if you want to enforce integer (not use Number?)what's the best practice here? the (...) rest may work but then you can't enforce a certain number of parameters at runtime, nor can you make for useful code completion?
Code: import fl.transitions.Tween; import fl.transitions.easing.*; var animTween:Tween;
[Code].....
I have figured out the following: Well, as you see the function moveStuff accepts three arguments, namely:
objectdurationeasingWhen easing has a default value, I get an error. But if it doesn't have a default value, then it works fine, the code would look like so then:
Code: import fl.transitions.Tween; import fl.transitions.easing.*; var animTween:Tween;
im trying to pass in an optional argument into a function. The datatype of this needs to be an object... however, im not getting very far. I know i can do this....
I'm revisiting some old code that filters XML, but this could easily apply to the parameters of a method (the way I'm using it, it essentially is). This is a problem I feel like I run into a lot and don't know a good way around this. So the problem is that I've got 3 arguments. They're all optional. I want to see which ones are presents and test if their values based on which ones are present (sorted according to likelihood):
I'm trying to find information in how or if it it possible to declare a Variable Type that can accomodate 1 of 2 different Types In this particular case I'd like to set a Variable able to accept either Integrals or Strings I know i Can use a wildcard as below and it works, but it also allows for any other type to be added.
private var _destination:*;
My first Thought was something like this
private var _destination:String^int; private var _destination:String|int;
I want to guess the type of every argument from an anonymous function, something like mapping a class with reflection but just for a function, something like...
public function guessMyArgumentType(f:Function):void { for each (argument:* in f.arguments) { trace(typeof(argument));
I have a function and it accepts an argument, it can be a MovieClip or an Array. How can I determine what the type is of the argument? I did an attempt, but it didn't work, my code currently looks like so:
Code: var peopleArray:Array = new Array("Alfred", "Bob", "Casper", "David"); function myFunction (givenArray:Object) { if (givenArray.dataType == Array) { trace ("This is an array"); // do stuff where an array is needed [Code] .....
MouseEvent.target will return the target object... but how do I access the specific object type? I know it's probably simple... but it's late and I'm fried. The code below obviously doesn't work. I just need someone to tell me what to put instead of [object MovieClip] and [object SimpleButton]
Code: stage.addEventListener(MouseEvent.CLICK, fOnClick); function fOnClick(e:MouseEvent):void {
I have the following which produces a trace if the user does not type an email address when testing locally, but nothing when testing outside of Flash.
I basically need to scale an object up when the user rollsover the button which I have created dynamically already and I need to make sure the object is fully scaled up before I can allow the user to scale it back down again.Ive tried putting 2 tweens (x and yscale) into a function but not sure how to check if the tweens have finished. Im assuming if I check the function is complete it wont take into consideration the tweens may still be running.
Why does the trace in the loop below return false for every iteration, even though there ARE nodes named with 6 of the 8 possible values??? This only happens when I have a namespace. Is there some other way to check for the node values???
I need to check for file existence in Flash on x number of videos. I've tried LoadVars and MovieClipLoader. LoadVars works but it actually loaded the entire video before reporting its done. Without a way of knowing that its started, I can't delete it before its done. I don't what to load the entire video, i just want to check that its there. MovieClipLoader has onLoadError and onLoadStart, which works because I can unload the MovieClip right after its starts loading and know its there and if there's a load error I know it's not there. Should work, but I need to run that x number of times to check for the other videos.
What is the best method to test the existence of an attribute on an XML object in ActionScript 3 ttp://martijnvanbeek.net/weblog/40/testing_the_existance_of_an_attribute_in_xml_with_as3.html is suggesting to test using
if ( node.@test != node.@nonexistingattribute )
and I saw comments suggesting to use:
if ( node.hasOwnProperty('@test')) { // attribute qtest exists }
But in both case, tests are case sensitiveFrom the XML Specs : "XML processors should match character encoding names in a case-insensitive way" so I presume attribute name should also be match using a case-insensitive comparison.
I have a frame where there a 5 input text fields that the user can fill in. THey may not fill them all in though. In the next frame I want to push the fields that they filled in into an array.how do I determine what they filled in and what they didn't.
i want to create a pop up whenever we click a button.if that pop up is already opened i need to remove that pop up and need to add it newly. is ther any way to find existence of popup ?
I'm working on a simple non-XML-based slide show where the container MC dynamically loads sequentially numbered files (01.swf, 02.swf, 03.swf, etc). As you may already be gathering, I want to write a little loop that returns true if the file is there, e.g. if there's only files, 01.swf � 07.swf and the loop checks for 08.swf and doesn't find it, it returns false. BTW, in this particular case checking loader MC's _width won't work, so I need an alternative to that.
I have an array with some elements that may repeat themselves or not (this is actually because they're attributes retrieved from xml nodes, but you don't need to know that); what I want to do is: go through that array and check for elements and store them in another array according to the following condition (this is where it gets tricky): if that element does not exist in the final array yet, store it; if it does exist already, nevermind it.
I wrote this code: //custom method for searching through array Array.prototype.contains = function(searchValue){ for(i=0; i<this.length; i++){ if (this[i] == searchValue){ return true [Code] .....
Trace returns lisbon, oporto, oporto, coimbra, oporto, coimbra wich means that the only element in the destinations array being prevented from getting pushed into the final array is the first element in the initial array (in this case, "lisbon")... but if it prevents the first one, how come it doesn't prevent the others, damn it?...
I have a parent.swf file that loads a child.swf. When the child.swf is running on it's own, I'd like it to do one thing, but if it has been loaded into the parent.swf. I want it do something else (i.e. change behavior). Is there a way for the child.swf to detect whether it has been loaded into a parent.swf or not?
I'm using the FLVPlayback class to play my FLV files.
If I'm trying to play a FLV file which is not existed yet then I am getting a "VideoError: 1000" with message of Unable to make connection to server or to find FLV on server.
I want to check for the FLV file existence using the file URL or path, before playing that FLV by FLVPlayback.
My Flex 3 application has some modal dialogs displayed via the PopUpManager, but there are times when I'd like other view components to know there is popup displayed. The PopUpManager doesn't have any method for actually checking the existence of popups. Is there any other way to detect this in flash/flex without writing my own global manager?
(also systemManager.popUpChildren.numChildren == 0 even when there's a modal popup)
I want to add things to the display list, some will have event listeners and some not. Is it possible to make an argument optional so it doesn't throw an error if it's not there when calling the function?
I have this function: Code: MovieClip.prototype.changeColor = function(mode, kl, kh, rl, rh, gl, gh, bl, bh) { } How can I make all parameters optional except the first one?
I want to create some functions similar to how GreenSock's tweening class works.With the optional parameters by name in brackets. {}[code]I get this error: "Parameter initializer unknown or is not a compile-time constant."Pretty sure it's the "Parameter initializer unknown", but I don't know what to do about it.
