Adding and removing leaf nodes at run time
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<!-- dpcontrols/TreeAddRemoveNode.mxml -->
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx">
<s:layout>
<s:VerticalLayout />
</s:layout>
<fx:Script>
import mx.collections.XMLListCollection;
[Bindable]
private var company:XML =
<list>
<department title="Finance" code="200">
<employee name="John H"/>
<employee name="Sam K"/>
</department>
<department title="Operations" code="400">
<employee name="Bill C"/>
<employee name="Jill W"/>
</department>
<department title="Engineering" code="300">
<employee name="Erin M"/>
<employee name="Ann B"/>
</department>
</list>;
[Bindable]
private var companyData:XMLListCollection = new XMLListCollection(company.department);
private function treeLabel(item:Object):String {
var node:XML = XML(item);
if( node.localName() == "department" )
return node.@title;
else
return node.@name;
}
private function addEmployee():void {
var newNode:XML = <employee/>;
newNode.@name = empName.text;
var dept:XMLList =company.department.(@title == "Operations");
if( dept.length() > 0 ) {
dept[0].appendChild(newNode);
empName.text = "";
}
}
private function removeEmployee():void {
var node:XML = XML(tree.selectedItem);
if( node == null )
return;
if( node.localName() != "employee" )
return;
var children:XMLList = XMLList(node.parent()).children();
for(var i:Number=0; i < children.length(); i++) {
if( children[i].@name == node.@name ) {
delete children[i];
}
}
}
</fx:Script>
<mx:Tree id="tree" top="72" left="50" dataProvider="{companyData}"
labelFunction="treeLabel" height="225" width="300" />
<mx:VBox>
<mx:HBox>
<mx:Button label="Add Operations Employee" click="addEmployee();" />
<mx:TextInput id="empName" />
</mx:HBox>
<mx:Button label="Remove Selected Employee" click="removeEmployee();" />
</mx:VBox>
</s:Application>
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