Flex中Tree的父节点、叶节点的操作小结.doc

Flex中Tree的父节点、叶节点的操作小结 近来主要涉及到的一个问题是根据用户操作动态地创建树结构，包括父节点、子节点。经过浏览相关书籍和网上的资料，顺利按需求完成了项目，现将此知识点总结一下。 首先肯定的是，tree用到数据绑定。要考虑的就是将怎样形式的数据绑定到Tree控件上来，提到XML、XMLList以及XMLListCollection与Tree的绑定，设计如下： Bindable private var xmlTree:XML= ; Bindable private var dataTree:XMLListCollection=new XMLListCollection(xmlTree.father); 下面涉及到树结构的操作，实际上是对XMLListCollection的操作，再往上就是对XML的操作，主要用到的操作符是.和。/*添加父节点* private function addFather(father:String):void var newFather:XML=; newFather.label=father; newFather.isBranch=true; xmlTree.appendChild(newFather); /*删除指定父节点* private function deleteFather(father:String):void var fath:XMLList=xmlTree.father.(label=father); for(var i:int=0;ifath.length();i+) delete fathi; /*删除所有父节点* private function deleteFathers():void var fath:XMLList=xmlTree.father; for(var i:int=0;ifath.length();) delete fathi; /*给指定父节点添加子节点* private function addNode(father:String,node:String):void var newNode:XML=; newNode.label=node; var fath:XMLList=xmlTree.father.(label=father); if(fath.length()=0) /增加子节点 fath0.appendChild(newNode); /*给指定父节点删除子节点* private function deleteNode(father:String,son:String):void var fath:XMLList=xmlTree.father.(label=father); var childs:XMLList=fath.children(); var iDelete:int; for(var i:int=0;ichilds.length();i+) if(childsi.label=son) iDelete=i; break; delete childsiDelete; /*删除所有子节点* private function deleteNodes(father:String):void var fath:XMLList=xmlTree.father.(label=father); var childs:XMLList=fath.children(); for(var i:int=0;ichilds.length();) delete childsi; /*是否已有父节点* private function exitFather(father:String):Boolean var fath:XMLList=xmlTree.father; f