Cannot resolve attribute 'treeDataDescriptor' for component type mx.controls.Tree.

Hello

I'm trying to compile an example of documentation:
I have two files:

treeEx1.mxml

<? XML version = "1.0" encoding = "iso-8859-1? >
"" < mx:Application xmlns:mx = ' http://www.adobe.com/2006/mxml ' creationComplete = "initCollections ()" >

< mx:Script >
<! [CDATA]
Import mx.collections. *;
Mx.controls.treeClasses import. *;
Import customComp.MyCustomTreeDataDescriptor;
Variables used to build the collection data provider ArrayCollection
First top-level node and its children.
public var nestArray1:Object =]
{label: "item1", children: []}
{label: "child item1", children: []}
{label: "point 1 child child", data: "child data"}
]}
]}
];
Second top-level node and its children.
public var nestArray2:Object =]
{label: "item2", children: []}
{label: "child item2", children: []}
{label: "point 2 children", data: "child data"}
]}
]}
];
Second top-level node and its children.
public var nestArray3:Object =]
{label: "item3", children: []}
{label: "child item3", children: []}
{label: "item 3 children", data: "child data"}
]}
]}
];
Variable for the table in the tree.
public var treeArray:Object
Variables for the three collections of table that correspond to the
top-level nodes.
public var col1:ArrayCollection;
public var col2:ArrayCollection;
public var col3:ArrayCollection;
Variable for the ArrayCollection collection that is used as the provider of data tree.
[Bindable]
public var ac:ArrayCollection;

build HQ collection ArrayCollection of its parts.
public function initCollections (): void {}
Wrap each top-level node in a collection of ArrayCollection.
col1 = new ArrayCollection (nestArray1);
col2 = new ArrayCollection (nestArray2);
COL3 = new ArrayCollection (nestArray3);
Put the top-level node in the treeArray three ArrayCollections.
treeArray =]
{label: "first thing", children: col1},.
{label: "second thing", children: col2},.
{label: "third thing", children: col3},.
];
Wrap the treeArray in an ArrayCollection collection.
AC = new ArrayCollection (treeArray);
}

Adds a child node as the first child of the selected node,
If necessary. SelectedNode default is null, which causes the
data descriptor addChild method to add it as the first child
AC collection ArrayCollection.
public function clickAddChildren (): void {}
var newChild:Object = new Object();
newChild.label = "new child";
newChild.children = new ArrayCollection();
tree.treeDataDescriptor.addChildAt (tree.selectedNode, newChild, 0, ac);
}

[]] >
< / mx:Script >

< mx:Tree width = "200" id = "tree" dataProvider = "{ca}.
treeDataDescriptor = "{new MyCustomTreeDataDescriptor()}" / >
< mx:Button label = "add children" click = "clickAddChildren ()" / >
< / mx:Application >

and
and MyCustomTreeDataDescriptor.as:


package customComp.MyCustomTreeDataDescriptor
{
Import mx.collections.ICollectionView;
Import mx.collections.IViewCursor;
Import mx.events.TreeModelChangedEvent;
Import mx.events.TreeModelChangedEventDetail;
Mx.controls.treeClasses import. *;

/ public class MyCustomTreeDataDescriptor implements ITreeDataDescriptor
{

The getChildren method requires the node for an object
with a field of children.
If the field contains a collection of ArrayCollection, it returns the field
In the contrary case, it wraps the field in an ArrayCollection collection.
public void getChildren (object: node,)
model: Object = null): ICollectionView
{
Try
{
If (the node object)
{

If (node.children is collection ArrayCollection) {}
Return node.children;
} else {}
return new ArrayCollection (node.children);
}
}
}
catch (error)
{
trace ("exception [descriptor] seeking getChildren");

}
Returns a null value.
}

IsBranch method simply returns true if the node is a
Object with a field of children.
It does not support empty branches, but supports children null
fields.
public void isBranch(node:Object,_model:Object=null):Boolean
{
Try
{
If (the node object)
{
If (node.children! = null)
{
Returns true;
}
}
}
catch (error)
{
trace ("exception [descriptor] audit of the isBranch");
}
Returns false;
}

The getData method simply returns the node as an object.
public void getData(node:Object,_model:Object=null):Object
{
VR;
{
Return Object (node);
}
catch (error)
{
}
Returns a null value.
}

The addChildAt method does the following:
If the node parameter is null or undefined, inserts
the parameter child as first child of the template parameter.
If the node parameter is an object and has a field of children,
Adds the child parameter this parameter to the index.
It does not add a child to a leaf node if it does not
a field of children.
public void addChildAt(node:Object,_child:Object,_index:int,_model:Object=null):Boolean
{
var event: TreeModelChangedEvent = new TreeModelChangedEvent ("modelChanged", false, false, TreeModelChangedEventDetail.ADD_NODE, child, node, index);

If (! node)
{
var iterator: IViewCursor = model.createCursor ();
Iterator.Seek (CursorBookmark.FIRST, index);
Iterator.Insert (Child);
}
else if (node is object)
{
If (node.children! = null)
{
If (node.children is collection ArrayCollection) {}
node.children.addItemAt (child, index);
If {(model)
model.dispatchEvent (event);
model.itemUpdated (node);
}
Returns true;
}
else {}
node. Children.splice (index, 0, children);
If (model)
model.dispatchEvent (event);
Returns true;
}
}
}
Returns false;
}

}
}

I have read the docs and looked through a few examples on this form but I still can't understand.

Thank you

The above code is:
http://127.0.0.1:56812/help/topic/com.Adobe.FlexBuilder.help/HTML/Part2_DevApps.html
Using hierarchical data providers

I think that the name of the property went from treeDataDescriptor to dataDescriptor before the release of the beta 3. I don't think that the documentaton in the developer's guide has been updated after Beta 3.

Tags: Flex

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    Thank you and best regards,

    Srinivas R

    Microsoft technical support.

    Visit our Microsoft answers feedback Forum and let us know what you think.

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