I'm facing some problems in AS3. For example, I have two classes Car.as and ReadXML.as as follows:
Car.as
public class Car{
public function get price():String{
var priceXML:ReadXML = new ReadXML('price.xml');
return priceXML.file;
}
}
ReadXML.as
public class ReadXML{
public var file:XML;
public var loader:URLLoader;
public function ReadXML(fileName:String):void{
loader = new URLLoader();
loader.addEventListener(Event.COMPLETE, _loadComplete);
loader.load(new URLRequest(fileName));
}
private function _loadComplete(e:Event):void{
file = new XML(loader.data);
loader.removeEventListener(Event.COMPLETE, _loadComplete);
}
}
But when I try to access the price property,
var carObj:car = new Car();
trace(carObj.price)
it returns null which I presume is because the URLLoader hasn't been finished. So what is an alternative or solution to this? Thanks!
I think loading an XML file every time you want to check an instance's 'price' property is the problem.
I'd recommend loading the XML file as part of your application's initialisation, and including the _loadComplete function as part of that initialisation; When the XML is loaded, your application can then continue and instantiate as many 'new Car()'s as it fancies - no delay will be required if the XML is pre-loaded.
Related
I have a loader swf acting as the main swf that is responsible for loading and rendering external swf's.
In the document class of the loader swf, I have a function named test.
public function test() {
ExternalInterface.call("console.log", "Test");
}
I want to call this function from the child swf that is being loaded in using an external class known as StateManager. A new instance of the StateManager class is being created in the document class of the loader swf as can be seen below.
import com.xxxx.state.StateManager;
public class Loader extends MovieClip {
private static var _instance:Loader;
public static function get instance() { return _instance; }
public var stateManager = new StateManager();
// Other code has been ommited obviously.
}
A function is then called in StateManager which renders the new swf.
public function setActiveState(url) {
var request = new URLRequest(url);
var loader = new Loader();
loader.load(request);
addChild(loader);
}
In the child swf's document class, I have attempted to call the loader swf's test function using many different methods, all of which have resulted in nothing happening and no error being produced (I have confirmed that the child swf is rendering properly). I have tried using the following code.
public class ChildSWF extends MovieClip {
public function ChildSWF() {
MovieClip(parent.parent).Loader.instance.test();
}
}
As well as
public class ChildSWF extends MovieClip {
public function ChildSWF() {
MovieClip(parent.parent.parent).Loader.instance.test();
}
}
and many other pieces of code that I have seen when researching this problem. If anyone could help, that would be greatly appreciated.
First. Never, absolutely never name your classes as the already existing classes. You're, like, welcoming future troubles with the huge neon WELCOME display with the occasional firework blasts in the background.
Then. Your class Loader is not a member (nor a variable) of any display object and just cannot be accessed the way you try it. Classes do not work like that. They are definitions of the ApplicationDomain. You might want to find and read about it: http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/system/ApplicationDomain.html#getDefinition()
The rest is pretty simple.
public var callBack:Function;
public function setActiveState(url, handler)
{
callBack = handler;
var request = new URLRequest(url);
var loader = new Loader;
loader.load(request);
addChild(loader);
}
Then in the loaded content:
public class ChildSWF extends MovieClip
{
public function ChildSWF()
{
(parent.parent as Object).callBack();
}
}
The loaded content will call whatever method reference you will have in the callBack variable;
I'm building an application using Flash CS6 and AS3, where there will be loads of texts. So I want to create only one text format object for all of them. I am using this code:
public class MyClass extends MovieClip {
public var formatTitle = new TextFormat();
formatTitle.size = 50; <-- ERROR HERE
public function MyClass(){
buildHome();
}
public function buildHome(){
var title:TextField = new TextField();
title.text = "HOME";
title.defaultTextFormat = formatTitle;
addChild(title);
}
}
But I'm getting the error: Access of undefined property formatTitle where it says formatTitle.size = 50. But it's here above it! What am I missing?
Thanks in advance.
You need to move formatTitle.size = 50; at the beginning of the constructor. You can't have code like this outside of a method.
public function MyClass(){
formatTitle.size = 50;
buildHome();
}
i'm trying to load an xml file from my assets folder.
I wrote this function :
public static function loadXML(i_fileURL:String):XML // i want to return the actual loaded xml here
{
var xml:XML;
var ldr:URLLoader = new URLLoader();
var request:URLRequest = new URLRequest(i_fileURL);
ldr.addEventListener(Event.COMPLETE, onXMLLoad);
ldr.load(request);
//how can i return the loaded xml?
}
public static function onXMLLoad(e:Event):void
{
var ldr:URLLoader = URLLoader(e.target);
var myxml:XML = new XML(ldr.data);
trace(myxml.toXMLString());
//how can i return myxml to loadXML function?
}
Is there a different way to do this?
Thank you!
You can do something like a promise or future, where you return empty XML and then populate it with the actual XML when the call returns. Since you are using Flex, you have access to data binding, which should allow this approach to work just fine.
Note that you really shouldn't be using static methods for this, and your onXMLLoad member has no reason to be exposed. Here's what the updated code might look like:
package service {
public class XMLLoader {
//note that the existence of this variable means that you need
//to create a new instance of the Class each time you make a call.
protected var future:XML;
protected var _url:String;
public function loadXML(url:String):XML {
_url = url;
var request:URLRequest = new URLRequest(url);
var loader:URLLoader = new URLLoader();
loader.addEventListener(Event.Complete, onLoad);
loader.addEventListener(IoErrorEvent.IO_Error, onFail);
loader.addEventListener(SecurityErrorEvent.Security_Error, onFail);
future = ;
return future;
}
protected function onLoad(e:Event):void {
var loader:URLLoader = e.currentTarget as URLLoader;
var data:XML = loader.data as XML;
if (data) {
//you lose your original root node, because you want data
//binding to fire on the future object you returned.
future.setChildren(data.children());
}
}
protected function onFail(e:Event):void {
//both Security and IOerrors have a text property, but they
//can't both be cast to the same thing.
trace('failed to load', _url, e[text]);
}
}
}
One thing to be aware of with this method is that you need to keep a reference to the instance around until the data has updated, or else it could be garbage collected before it populates the future. Because of that, you're probably better off following the conventional approach of having your instance dispatch a custom event that carries the data that it was retrieving. If you want an example of that, post back and I can provide you an example.
you can't. because xml load request is asynchronous. when you called loadXML, onXMLLoad not yet arrived. so such work impossible asynchronous return. surely you can waiting the function process while loop using, but this method not good. because to full use a cpu resource, overkill. you must next process in onXMLLoad function. It's the most appropriate. or xml variable declared as global, and using a ENTER_FRAME or TimerEvent as a way to continue to operate if the xml is not null.
Since the URLLoader is asynchronous, it's not safe to create a static loader function as it would be quiet easy to mix up returned data during multiple calls. Even if you attempted to accomplish what you want with the use of Event.OPEN and a vector of URLs to keep track of the which completed data should belong to each URL, asynchronousity works on a first-come, first-served basis so it wouldn't be possible to have persistent alignment of the file URL and the returned data.
I suggest that you create instances of an XMLLoader class that uses a custom XMLLoaderEvent, which will return both the xml data and the associated file URL. The following code is untested, but with possible typos aside, it should work as intended.
Use Case
var xmlLoader:XMLLoader = new XMLLoader();
xmlLoader.addEventListener(XMLLoaderEvent.COMPLETE, xmlLoadCompleteEventHandler);
xmlLoader.load("myXMLFile.xml");
function xmlLoadCompleteEventHandler(event:XMLLoaderEvent):void
{
xmlLoader.removeEventListener(XMLLoaderEvent.COMPLETE, xmlLoadCompleteEventHandler);
trace(event.type, event.fileURL, event.xml);
}
XMLLoader.as
package
{
//Imports
import flash.events.EventDispatcher;
import flash.events.Event;
import flash.net.URLLoader;
import flash.net.URLRequest;
//Class
public class XMLLoader extends EventDispatcher
{
//Properties
private var loader:URLLoader;
private var fileURL:String;
//Constructor
public function XMLLoader():void
{
loader = new URLLoader();
loader.addEventListener(Event.COMPLETE, loadCompleteEventHandler);
}
//Load
public function load(fileURL:String):void
{
this.fileURL = fileURL;
loader.load(new URLRequest(fileURL));
}
//Load Complete Event Hanlder
private function loadCompleteEventHandler(event:Event):void
{
loader.removeEventListener(Event.COMPLETE, loadCompleteEventHandler);
dispatchEvent(new XMLLoaderEvent(XMLLoaderEvent.COMPLETE, fileURL, XML(loader.data)));
}
}
}
XMLLoaderEvent.as
package
{
//Imports
import flash.events.Event;
//Class
public class XMLLoaderEvent extends Event
{
//Constants
public static const COMPLETE:String = "complete";
//Properties
public var xml:XML;
public var fileURL:String;
//Constructor
public function XMLLoaderEvent(type:String, fileURL:String = null, xml:XML = null)
{
super(type);
this.xml = xml;
this.fileURL = fileURL;
}
//Clone
public override function clone():Event
{
return new XMLLoaderEvent(type, fileURL, xml);
}
//To String
public override function toString():String
{
return formatToString("XMLLoaderEvent", "type", "fileURL", "xml");
}
}
}
Is it possible to create dynamic embed function in ActionScript3
for example like this
public function embedImage(path:String):Bitmap{
[Embed(source = path, mimeType = "image/png")]
var NewBitmapClass:Class;
var image:Bitmap=new NewBitmapClass();
return image;
}// tried it, it doesnt work
or maybe in some other way, or even if it is at all possible?
The closest you can get with the "dynamic" part, is to create a wrapper class, where you define your images, and you can get them as Bitmap later on by an id.
Unfortunately the properties are public, otherwise the hasOwnProperty function doesn't return true. (If someone finds a better way, please let me know)
See below:
package {
import flash.display.Bitmap;
public class DynamicEmbed {
[Embed(source = "../images/cat.jpg")]
public var cat : Class;
[Embed(source = "../images/parrot.jpg")]
public var parrot : Class;
[Embed(source = "../images/pig.jpg")]
public var pig : Class;
[Embed(source = "../images/quail.jpg")]
public var quail : Class;
public function DynamicEmbed() {
}
public function getBitmap(id : String) : Bitmap {
if(hasOwnProperty(id)) {
var bitmap : Bitmap = new this[id]();
return bitmap;
}
return null;
}
}
}
Embedded elements are embedded at compile time. You can't dynamically embed something at compile time... If you want to load resources dynamically, use the Loader.
No, embed source is embedded at compile time. You can not embed anything at run time. That's what embed means, embedding during building the swf.
I've created simple swf with interface:
public class Test extends MovieClip implements ITest
{
public function Test()
{
Security.allowDomain("*");
Security.allowInsecureDomain("*");
}
public function speak(str):String
{
trace(str);
return "yeah";
}
}
ITest:
public interface ITest {
// Interface methods:
function speak(str):String
}
And then I'm trying to load it:
public function SWFLoader()
{
var url='http://xxxxxxxx/test.swf';
var loadURL:URLRequest=new URLRequest(url);
var loader:Loader = new Loader();
loader.contentLoaderInfo.addEventListener(Event.COMPLETE, completeHandler);
var context:LoaderContext = new LoaderContext(false, ApplicationDomain.currentDomain);
loader.load(loadURL, context);
}
private function completeHandler(event:Event):void
{
var test:ITest;
test = event.target.content as ITest;
test.speak("ggg");
}
So if I have test.swf in the same directory(local way) it work's fine. But if I'm placing it on the dedicated server: (event.target.content as ITest) returns null. However, I can access speak() without interface like this event.target.content.speak("a!");
How to solve this problem?
try this:
var test:ITest = ITest(event.target.content );
http://help.adobe.com/en_US/ActionScript/3.0_ProgrammingAS3/WS5b3ccc516d4fbf351e63e3d118a9b90204-7f87.html
How do you share the ITest interface between your two swf ?
I imagine you have two projects one for the test.swf (the loaded one) and one for the loader (I'll call him loader.swf). I think you can't just declare the ITest interface twice (one for test.swf, one for loader.swf). If you do so, there will be two interfaces, with the same interface name, the same declared methods, but they still will be 2 different interfaces. And casting one into another will fail.
I bet that if you do (as suggested by PatrickS)
var test:ITest = ITest(event.target.content );
You will see a type error -> that's the advantage of this form of casting. This will confirm what I think : the two interfaces are different.
To really share the interface between your 2 projects, you should store it into a library (.swc file) and use that library in your 2 projects. This should solve the issue.