The definition of dataProvider programmatically causes null reference
I am trying to bind a drop-down list box to a list of countries via a HTTPService which returns xml code. If I set the dataProvider and declaratively labelField properties in the mxml, then it works fine. However, if I try to set it programmatically in the method that is called after the called HTTPService returns, then I get "TypeError: Error #1009: cannot access a property or method of a null object reference."Here is the dataServiceResult method:
[Bindable]
private var _lookupData:XML;
public void dataServiceResult(event:ResultEvent):void
{
_lookupData = event.result as XML;
cboCountry.dataProvider = _lookupData.countries.country;
cboCountry.labelField = "@name";
}
This causes the above error. However, if I have the last two lines of the method in comment and change the combo box return to resemble what follows, then it works fine:
< mx:ComboBox id = "cboCountry" styleName = "RequiredFieldLabel".
dataProvider = "{_lookupData.countries.country}" labelField="@name" "
change = "countrySelected ()" >
< / mx:ComboBox >
Any ideas? Declarative binding will work in this particular situation, but I have several other cases where I need binding programmatically to xml, so I need to get this script working. Thanks in advance for any help!
Aaron
The simplest way around this is to link the labelField and dataProvider to a variable or a get/set accessor, and then set the variables (or the Set accessor) in the result handler.
What is happening is that the combo box has not been instantiated in the place in which you try to set the values, so the null pointer.
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It's my source WindowedApplication:
<? XML version = "1.0" encoding = "utf-8"? >
"" < mx:WindowedApplication xmlns:mx = ' http://www.adobe.com/2006/mxml '
"" xmlns = "*".
paddingBottom = paddingTop = "0" "0".
paddingLeft paddingRight '0' = '0 = '.
Layout = "vertical".
pageTitle = "Photo Viewer"
creationComplete = "init ()" viewSourceURL = "srcview/index.html" > "
< mx:Script >
<! [CDATA]
Import mx.collections.ArrayCollection;
Mx.rpc.events import. *;
PhotoViewer Import. Gallery;
PhotoViewer Import. PhotoService;
[Bindable]
private var: Gallery;
[Bindable]
private var service: PhotoService.
private function init (): void
{
service = new PhotoService("data/galleries.xml");
}
[]] >
< / mx:Script >
This is my Gallery class source:
the photoviewer package
{
Import mx.collections.ICollectionView;
Import mx.collections.ArrayCollection;
Import mx.collections.IViewCursor;
[Bindable]
public class Gallery
{
public var name: String;
public var description: String;
public var photos: ArrayCollection collection;
public var selected: int;
private var photo: Photo;
public void Gallery (gallery:Object = null)
{
photos = new ArrayCollection();
If (Gallery! = null)
{
Fill (Gallery);
}
}
public void fill(gallery:Object):void
{
myIdName = gallery.id;
This.Description = gallery.description;
This.Selected = 0;
for (var i: int = 0; i < gallery.photo.length; i ++)
{
Photo = new Photo (gallery.photo );
photos.addItem (photo);
}
}
}
}
Someone knows how to fix this error?
"A file in a source path must have the same package structure", as the definition, 'photoviewer' package. '?
Kind regards
EvsPeart
Yes. If you want to file package photoviewer Gallery you create directory photoviewer in src and move the file there.
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