flex tree 节点的添加、删除。
myXml.xml：
<?xml version="1.0" encoding="utf-8"?><novel label="单元"> <part label="第一单元"> <part label="第一单元例题一"> <part label="练习题一" ></part> <part label="练习题二" ></part> </part> <part label="第一单元例题二"> <part label="练习题一" ></part> <part label="练习题二" ></part> </part> </part> <part label="第二单元"> <part label="第二单元例题一"> <part label="练习题一" ></part> <part label="练习题二" ></part> </part> </part> <part label="第三单元"> </part></novel>
[Bindable]public var selectedNode:XML;public var resultXML:XML;//初始化.public function preInit():void{var targetURL : String = "myXml.xml";var request : URLRequest = new URLRequest(targetURL);var variables : URLLoader = new URLLoader();variables.addEventListener(Event.COMPLETE, completeHandler);try{variables.load(request);}catch (error:Error){trace("无法加载" + error);}}private function completeHandler(event:Event):void{trace(event.target.data is String);selectedNode = new XML(event.target.data);myTree.dataProvider = selectedNode;}public function treeChanged(event:Event):void{selectedNode = Tree(event.target).selectedItem as XML;player.load();}//添加节点.protected function add_clickHandler(event:MouseEvent):void{var xml : XML = selectedNode..*.(@label == txtname.text)[0];if (xml){var xml1 : XML = new XML("<part label=\"" + txtname1.text + "\"></part>");xml.appendChild(xml1);}else{var array : Array = txtname.text.split("/");var asd : XML = selectedNode;for (var v:int=0; v < array.length; v++){var rr : XML = selectedNode..*.(@label == array[v])[0];if (rr){asd = rr;continue;}else{rr = new XML("<part label=\"" + array[v] + "\"></part>");asd.appendChild(rr);asd = rr;}}var firstNodeSon1 : XML = new XML("<part label=\"" + txtname1.text + "\"></part>");asd.appendChild(firstNodeSon1);}}//删除节点protected function del_clickHandler(event:MouseEvent):void{var array:Array=txtname.text.split("/");var xml:XML=selectedNode..*.(@label == array[array.length - 1].toString())[0];if (xml){delete xml..*.(@label == txtname1.text)[0];if (xml.part.length() == 0){ for(var v : int = array.length - 1; v >= 0; v --){ var rr : XML = selectedNode..*.(@label == array[v].toString())[0]; if(rr.part.length() == 0){ delete selectedNode..*.(@label == array[v].toString())[0]; } } delete selectedNode..*.(@label == array[array.length - 1].toString())[0];}}}<mx:Tree id="myTree" width="20%" height="100%" labelField="@label" dataProvider="{selectedNode}" showRoot="false" change="treeChanged(event)" alpha="0.5"/><s:TextInput id="txtname" text=""/><s:TextInput id="txtname1" text=""/><s:Button label="添加" click="add_clickHandler(event)"/><s:Button label="删除" click="del_clickHandler(event)"/>添加如下图所示：
删除也可以向上图那样输入， 第二个输入框的值的父级节点或父级的父级等等没子节点时, 会把父级以及以上没有子节点的父级一起删除, 否则不会删除有子节点的父级。