Hi All,
I have a Simple Tree whose Data Provider is an ArrayCollection of
Custom ActionScript Node Object (the code is listed below..)
When i add a new Child Node to any of the Nodes in the Tree i can
get the parent of this Node without any problems..
How ever when i try to add a new Child Node for the Previously added
Node i cannot get the Parent of the newly added Child Node..!!!
Initial Tree:
Root
Node-1
1) Add a Child Element to Node-1
Root
Node-1
ChildNode-1
Now i can get the parent of the ChildNode-1
2) Now add a new Child to childNode-1
Root
Node-1
ChildNode-1
ChildOfChildNode-1
Now i cannot get the parent of ChildOfChildNode-1 !!!
I am calling the getParent() method by passing the ChildNode and it
returns null..(the same method above returns the correct parent )
Here is the code i am using..
TreeNode.as:
[CODE]
package test
{
import mx.collections.ArrayCollection;
public class TreeNode
{
public function TreeNode()
{
}
public var nodeId:String;
public var nodeLabel:String;
public var parentId:String;
public var children:ArrayCollection;
public var parent:Node;
public function toString():String{
return "TreeNode[
nodeId="+nodeId+",nodeLabel="+nodeLabel+",
parentId ="+parentId+"]";
}
}
}
[/CODE]
TreeTest.mxml:
[CODE]
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml";
layout="absolute" creationComplete="init()">
<mx:Script>
<![CDATA[
import test.ChangedNode;
import mx.controls.Alert;
import test.TreeNode;
import mx.collections.ArrayCollection;
private var sourceArrayCollection:ArrayCollection =
null;
private var contextNode:TreeNode = null;
public function init():void{
trace("Here in init() of TreeDragDrop ");
sourceArrayCollection = new ArrayCollection();
populateChildNodes("SourceTree",sourceArrayCollection);
sourceCollectionTree.dataProvider =
sourceArrayCollection;
}
private function
populateChildNodes(nodeNamePrefix:String,collection:ArrayCollection):void{
trace("Here in populateChildNodes() ");
for(var i:int =0;i<5;i++){
var node:TreeNode = new TreeNode();
node.nodeId
=nodeNamePrefix+"-Id["+i+"]";
node.nodeLabel
=nodeNamePrefix+"-Label["+i+"]";
node.children = new ArrayCollection();
var childNode:TreeNode = new
TreeNode();
childNode.nodeId
=nodeNamePrefix+"child-Id["+i+"]";
childNode.nodeLabel
=nodeNamePrefix+"Child Label["+i+"]";
node.children.addItem(childNode);
collection.addItem(node);
}
}
public function treeLabel( item:Object ) : String{
var node:TreeNode =null;
node = TreeNode(item);
return node.nodeLabel;
}
private function getNodeInfo(event:Event):void{
trace("Here in getNodeInfo
-------------------------------");
var selectedNode:TreeNode =
Tree(event.target).selectedItem as
TreeNode;
trace("Selected Node ="+selectedNode);
contextNode = selectedNode;
}
private function createAggregation():void{
aggregationNameDisplayBox.visible = true;
aggregationNameTxt.setFocus();
}
private function saveAggregationName():void{
trace("Here in saveAggregationName() and
contextNode ="+contextNode);
var newChildNode:TreeNode = null;
var changedNode:ChangedNode = null;
if(contextNode!=null){
newChildNode = new TreeNode();
newChildNode.nodeLabel=aggregationNameTxt.text;
newChildNode.nodeId=Math.random().toString();
newChildNode.children = new
ArrayCollection();
if(contextNode.children==null){
contextNode.children = new
ArrayCollection();
}
newChildNode.parentId =
contextNode.nodeId;
contextNode.children.addItem(newChildNode);
trace("After Adding the Child Node..and
childNode ="+newChildNode);
var parentTarget :TreeNode =
sourceCollectionTree.getParentItem(newChildNode);
trace("Parent of the Child Node
="+parentTarget);
aggregationNameDisplayBox.visible =
false;
aggregationNameTxt.text ="";
trace("Expnad the Context
Node..."+contextNode);
expandContextNode();
}
else{
Alert.show("Please select a Context
Node First");
}
}
private function expandContextNode():void{
trace("Here in expandContextNode and contextTree
="+sourceCollectionTree+" && contextNode ="+contextNode);
var argsArray:Array = new Array(2);
argsArray[0]=this.contextNode;
argsArray[1]= true;
if(sourceCollectionTree!=null){
sourceCollectionTree.callLater(sourceCollectionTree.expandChildrenOf,argsArray);
}
else{
trace("Context Tree is NULL in
expandContextNode() !!!!");
}
}
]]>
</mx:Script>
<mx:VBox>
<mx:HBox>
<mx:Button id="createAggregationBtn"
click="createAggregation()"
label="Aggregation" toolTip="Create Aggregation"/>
<mx:HBox id="aggregationNameDisplayBox"
visible="false">
<mx:Label text="Name Display"/>
<mx:TextInput id="aggregationNameTxt">
</mx:TextInput>
<mx:Button id="submitAggregation"
label="Go"
click="saveAggregationName()"/>
</mx:HBox>
</mx:HBox>
<mx:HBox width="100%" height="90%">
<mx:Tree id="sourceCollectionTree"
labelFunction="treeLabel"
showRoot="true"
width="100%" height="100%"
change="getNodeInfo(event)"
/>
</mx:HBox>
</mx:VBox>
</mx:Application>
[/CODE]
Once i add a child to a node the tree's dataProvider is getting
updated internally (i am not making an explicit call.. Do i need to
call a method to refresh the tree dataProvider ?? I checked the
valiedateNow() but i guess they are for checking whether the UI needs
a repaint ..
Thanks
Mars..
