Flex :: How To Cast One Object As Derived Type
Nov 3, 2009
Here's the example:
var cartesian:CartesianChart = new CartesianChart();
cartesian.width = 100;
var column:ColumnChart = new ColumnChart();
column = cartesian as ColumnChart;
Why does this not work? "column" ends up null. ColumnChart is a derived class of CartesianChart, so I would have thought I'd end up with a ColumnChart with a width of 100.
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Similar Posts:
Feb 8, 2010
So I just started using JASON to make my application data driven. I'm not doing any encoding, only decoding (I encoded once to create an example data layout). My question is, how come I can't cast the data that I read in into the object that it is? I know that question is useless without an example so here goes:This is my data class that I encoded once to create an example JSON file.
ActionScript Code:
public class ButtonData
{
[code].....
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Jun 24, 2011
why the Event type isn't recognized in a subclass of a class derived from EventDispatcher?Here's the class hierarchy:
public class C extends EventDispatcher implements IC
public class H extends C implements IC
Then in H, I'm trying to create a method:
private function loadXML(evt:Event):void
and I get the error:
- Type was not found or was not a compile-time constant: Event
When I try to use dispatchEvent(new Event("myEvent")) in a couple of other private methods in H I get the following errors:
-Type was not found or was not a compile-time constant: Event
-Call to a possibly undefined method dispatchEvent
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Nov 1, 2010
Is it possible to cast a variable as a type dynamically, where the type would be a variable of type Class? Consider the following (invalid):
var myClass:Class = MyClass;
var myInstance:myClass = new myClass();
For context: I'm working in Flex (4) to create a modal manager that will control various aspects of creating modals (via PopUpManager) and I'd like to keep it as minimal as possible. Components would be passed through the same functions, and rather than allowing any type of variable to be cast, eg:
[Code]...
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Feb 21, 2009
[code]How to set focus to class1_txt?I've tried this, but doesnt work. How to type cast it so that the focus goes to the class1_txt.[code]
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Aug 24, 2004
Ach. I have a class that extends MovieClip called AxonClip, and a class that extends AxonClip called Target. I create several new Target objects like so:
Code:
Targets[i] = new Target("Targ"+i);
Targets[i].attachMovie("TargetArt", "TarGuy"+i, iDepth);
[code].....
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Apr 11, 2012
It is quite simple to do it, you write the object down to file, then you read it:
[Code]...
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Jun 27, 2011
How can i cast a object to another type? in AS3 i tried putting (objectType) infront of the variable but it doesnt work, below i have added objects of fishes into the child, and i am getting the fishes back out when mouse down is triggered, and then calling the fishes what to do. however i cant call the method of the custom class fish because it is a displayobject.[code]...
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Aug 6, 2011
We create Objects in flex by declaring type Object. for example
var objSampleObject:Object = new Object();
and we create properties directly with dot operator without creating any class
[Code].....
My question is in above process is there any class is created internally by flex?
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May 26, 2009
In my app i am pushing data into an array collection. When I debug or trace the AC i get [object Object].
public var newsDB:ArrayCollection = new ArrayCollection;
then I add to the AC here.
if(archive.selected == true){
newsDB.addItem( {
title: titleText.label,
clickURL: clickURL.text,
[Code]....
When I debug, i can see that the items are in the AC, but as generic objects.
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Feb 11, 2011
I have a tree with nodes , and a delete button , first user select the node and click this delete button , I want this node to be removed from the tree , Its not XML , every node in tree is of type Object
{label:'folder',children:[{label:'file1'}]}
I tried delete myTree.selectedItem (but compiler wont let me do it) also tried myTree.selectedItem = null (just unselects the item)and also how can I access reference to parent object of myTree.selectedItem ?
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Jun 28, 2011
I'm working (for my sins) on a Flex 3.3 project, which unfortunately cannot be upgraded to a newer SDK version at this stage, and have hit an issue with the custom hierarchical tree class (subclassing mx.controls.Tree) we're using. Excuse the spelling; the previous developer had a fear of dictionaries...
public class HierachyTree extends Tree
public function HierachyTree()
{[code].....
I'm using a solution somewhere between these two methods (basically, implementing ITreeDataDescriptor) in order to add live text filtering to the component, and it's working so far:
public class HierachyTreeFilteredDataDescriptor implements ITreeDataDescriptor
{
private var filter:Function[code]..........
The issue is that (with tree:HierachyTree) neither tree.maxVerticalScrollPosition nor the protected property tree.verticalScrollBar .maxScrollPosition updates when the search string is changed.I've tried calling invalidateList() and invalidateDisplayList() on tree — and calling invalidateDisplayList() and invalidateSize() on tree.verticalScrollBar — to no avail.
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Sep 13, 2010
I have an action script Object that contains an array collection of other object, both objects are reflects of the Java Objects which are the database tables represented as beans, i am using blazeds spring hibernate... the regular configurations for flex RIA with java backend server language, all other objects work perfectly, but this time i needed to get this data from the client side and i do, but when i get into the Set represented as array collection in client side i get this error! both classes work for other situations, mapping is ok for these classes, i suspect that i need to convert the array collection on the server side.
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Jun 13, 2011
1118: Implicit coercion of a value with static type Object to a possibly unrelated type flash.geom:Rectangle.I got this error coming from the bold words when I tried to use this AS2 code in my AS3 stage. I'm currently trying to convent an AS2 printing of DataGrid to AS3. [code].....
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Jan 20, 2010
I'm in the beginning stages of trying to understand AS3.Flash is outputting these two errors:1118: Implicit coercion of a value with static type Object to a possibly unrelated type Function.1120: Access of undefined property event_obj.
Code:
my_cb.addItem({data:1, label:"First Item"});
my_cb.addItem({data:2, label:"Second Item"});
my_cb.addItem({data:3, label:"Third Item"});
[code]....
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Oct 7, 2011
I have a Flex tree control that holds a tree full of various types of objects. I'd like to change the label of the item based on this type (and other properties). I'd prefer to do this in a custom TreeItemRenderer rather than via label or labelfunction.It seems that whatever I do, I cannot typecheck nor cast the objects and thus I get [Object object] in the nodes of my tree. Here is my renderer:
public class MyCustomTreeItemRenderer extends TreeItemRenderer {
// Overriding to set the text for each tree node.
override protected function updateDisplayList(unscaledWidth:Number,
[code]....
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Nov 21, 2011
I have the code in one of my flex file used as labelFunction in a DataGrid.When I run the FlexPMD to do the code review, it generates an objection about the dynamic type object used in the following method signature and it suggests to use strongly type object.
public function getFormattedCreatedTime(item:Object, column:DataGridColumn):String {
var value:Date=item[column.dataField];
return dateFormatter.format(value);[code]....
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Aug 28, 2009
Everything seems to be a string right now & that kinda ruins the whole xml as an internal data structure thing, I don't need a big tree of string I need typed data :-/ Are there any changes I can make to either my XML files or my AS3 code that will force it to cast ints as ints and Numbers as Numbers? Or maybe some kind of type schema I can impose? Not really worked with XML til recently so chances are I'm just ignorant of the canonical way to deal with this...
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Jan 25, 2012
I have a a structure like this:
e.item.fatturato_ac_s1
e.item.fatturato_ac_s2
e.item.fatturato_ac_s3
e.item.fatturato_ac_s4
[...]
and so on...
In order to compute dynamically the string I wrote:
e.item.(myStr.toString()) where myStr (type string) = "fatturato_ac_s" + Index (so I can have fatturato_ac_s1, fatturato_ac_s2, ...)
I can correctly retrieve the value of e.item.(myStr.toString()) (a numeric value), but if I try to put it in a variable I get the error in the title:
myVariable = e.item.(myStr.toString())
myVariable is a Number.
I also tried:
myVariable = Number(e.item.(myStr.toString()))
But doesn't work... the same if I try String to String....
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Oct 11, 2009
I keep getting the following error msg below I would be very happy if some knows the solution to this: Error Msg: 1118: Implicit coercion of a value with static type Object to a possibly unrelated type flash.events:Event Object A dispatches Event as:
[Code]...
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Apr 28, 2011
My application currently contains a number of Widgets that are managed by a Widget Manager. When the user clicks on a widget (e.g. a Helper widget), the Widget Manager loads the widget into a separate sibling application domain with the following line of code:
wgtInfo.load(null, null, null, moduleFactory); //wgtInfo = IModuleInfo
However, I am unable to use the widget's variables and functions later on. I attempt to find the Helper widget from the Widget Manager's list of widgets, and I do successfully. But when I try to caste the Helper Widget from type IBaseWidget (the interface all widgets share) to type HelperWidget, I receive the following error:
TypeError: Error #1034: Type Coercion failed.....
This is because the application domain of the class trying to use the Helper widget is different from the application domain of the Helper Widget. I tried to fix this by loading all widgets into the same application domain as the loader:
wgtInfo.load(ApplicationDomain.currentDomain, null, null, moduleFactory);
I now get the following error whenever I attempt to load the Helper widget:
TypeError: Error #1009: Cannot access a property or method of a null object reference.
How can I load my Helper widget into a common application domain that is accessible by the other widgets?
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Jun 27, 2011
i'm trying to modify a image, which is casted from a String:[code]In the inactiveElements Array are a bunch of ImageIds (way_0, way_1,..) and i'm trying to set the alpha-value of each Image.[code]with the trace i got the right String of ImageId but the cast to Image fails.[code]
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Feb 26, 2012
I get this error when compiling an AS3/Flex project: Error 1118: Implicit coercion of a value with static type Object to a possibly unrelated type HRPeople I've clearly declared dataHR_A to be of class HRPeople, and I've initialized all of the arrays inside the HRPeople.as file. Not sure why I'm getting this error.
[Code]...
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Mar 10, 2011
say i have an xml node like this:
Code:
<vars>
<start>45</start>
<duration>10</duration>
</vars>
how would i go about parsing that out into an Object so that it looks like this:
[Code]...
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Sep 20, 2009
I'm using as3corelib to decode/encode JSON strings. In my little experiment I want to encode an object (UserInfo) to JSON string and decode it back to the object, however it seems to fail at the convertion point (the last line), why would that happen? how can I make it work?
The UserInfo class
public class UserInfo
{
public var levelProgress : int;
}
[Code]....
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Jan 25, 2011
just learning as3 for flex. i am trying to do this:
var someNumber:String = "10150125903517628"; //this is the actual number i noticed the issue with
var result:String = String(Number(someNumber) + 1);
I've tried different ways of putting the expression together and no matter what i seem to do the result is always equal to 10150125903517628 rather than 10150125903517629.
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Mar 1, 2011
I have a flex application with two objects: a parent widget (called an IBaseWidget) and a child widget (called a HelperWidget2).When the user clicks on a help link, a helper widget is loaded into the list of base widgets and then displayed for the user.However, when I try to access this child widget by casting the base widget in the collection to the child widget type,the child widget returns null and I am unable to work with the widget.The following snippet correctly returns the widget ID of the newly added widget and dispatches an event to load the widget:
var id:Number = WidgetManager.getInstance().getWidgetId("Helper");
ViewerContainer.dispatchEvent(new AppEvent(AppEvent.WIDGET_RUN, id, openQuickQueryCanvas));[code].........
The problem is that helperWidget above always returns null, meaning the cast isn't successful.
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Nov 21, 2010
Im trying to connect a Flash client to BlazeDS. There has been some success with this from others using the vanilla BlazeDS setup. However I'm using the new Spring BlazeDS Integration from springsource and running aground. The flash client actually seems to be working in that I can see the correct data in the body of the returned object, but for some reason unknown it fails casting as an IMessage. It fails in PollingChannel.as on this line with the subject line error
var messageList:Array = msg.body as Array;
for each (var message:IMessage in messageList) <--
On application load I register a whole bunch of classes like so
registerClassAlias( "flex.messaging.messages.RemotingMessage", RemotingMessage );
registerClassAlias("mx.messaging.messages.IMessage", IMessage);
etc..
my code is basically
var channelSet:mx.messaging.ChannelSet = new mx.messaging.ChannelSet();
var channel:mx.messaging.channels.AMFChannel = new AMFChannel("my-amf", "http://localhost:8400/SpringA/messagebroker/amf");
channelSet.addChannel(channel);
[code]....
I have a flex client which works 100% with same destination/channel.
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Jun 5, 2009
I have this code, and in the end, where I am trying to removeChild(ball) I get an error:
[Code]...
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Jun 15, 2010
Just started playing with the new AIR functions NetworkInfo and NetworkInterface, but can't build ...
This is the example I started from: tourdeflex But these lines cause errors:
var networkInfo:NetworkInfo = NetworkInfo.networkInfo;
var networkInterfaces:Vector.<NetworkInterface> = networkInfo.findInterfaces();
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