flex tree 动态加载 以及自动展开

首先主要是百度的前辈的资源，自己修改了一部分，可是还是有自己的努力成果，希望可以帮助一下大家

首先是flex的代码

/**
* 获取子级
**/
public function getDeptChildrenDept(n_jgdh:String):void{
_request = new WebServiceReuqest(_serviceUrl);
_request.resultHandle = handleTheReslut;
_request.data = n_jgdh;
_request.request("getTree",n_jgdh,_deptType);
}
/**
* 获取机构返回的数据处理函数
* */
private function handleTheReslut(data:Object,jgdh:String = null):void{
var str:String = data as String;
if(str!=null&&str!=""){
var child:XML = new XML(str);
if(selectedNode.children()==null||selectedNode.children().length()==0){ //判断是不是已经有子级了
if(selectedNode.parent()!=null){
mytree.dataDescriptor.addChildAt(selectedNode.parent(),child,selectedNode.childIndex(),null); //把这个机构加到树上去
delete selectedNode.parent().children()[selectedNode.childIndex()];//删除已有的那个结点
mytree.expandItem(child, true);//展开，这个child就是新加的那个结点，因为之前结点已经删除
}else{
selectedNode.appendChild(child);
mytree.showRoot = true;
}
}
}
}

<fx:Script>
<![CDATA[
import com.depth.viewer.facade.IocAppFacade;

import mx.collections.ICollectionView;
//树上显示其有几个子目录
private function tree_labelFunc(item:XML):String {
var children:ICollectionView;
var suffix:String = "";
if (mytree.dataDescriptor.isBranch(item)) {
children = mytree.dataDescriptor.getChildren(item);
suffix = " (" + children.length + ")";
}
return item[mytree.labelField] + suffix;
}
//树的点击事件
private function treeChange(e:Event):void{
hostComponent.selectedNode = Tree(e.target).selectedItem as XML;
var id:String  = hostComponent.selectedNode.attribute("id");
hostComponent.setMapCenterPoint(id);
if(hostComponent.selectedNode.children()==null||
hostComponent.selectedNode.children().length()==0){
hostComponent.getDeptChildrenDept(id);
}
IocAppFacade.sendNotification(ConstFacade.LOAD_BUSINESS_AREA_LIST,id);
}
]]>
</fx:Script>
<mx:Canvas  width="100%" height="100%">
<mx:Tree id="mytree" width="100%" height="100%"
dataProvider="{hostComponent.listtree}"
labelField="@label"
showRoot="true"
labelFunction="tree_labelFunc"
change="treeChange(event)"
folderClosedIcon="@Embed('assets/yz-icons/legend/open.png')"
folderOpenIcon="@Embed('assets/yz-icons/legend/close.png')"
defaultLeafIcon="@Embed('assets/yz-icons/legend/default.png')"/>
</mx:Canvas>

接着是后台的代码就很简单的

HttpServletRequest request = XFireServletController.getRequest();
HttpSession session = request.getSession(true);
List<Map<String,String>> list = common.getDeptChild(n_jgdh, session);
OrganManage organManage = new OrganManage();
Organ organ = organManage.getOrgan(Integer.valueOf(n_jgdh), session);
String startnode = "<node type=\""+organ.getN_jglx()+"\" label=\""+organ.getC_jgmc()+"\" id=\""+organ.getN_jgdh()+"\">";
String endnode = "</node>";
StringBuilder result = new StringBuilder();
result.append(startnode);
for(int i = 0;i<list.size();i++){
if(getIsput(list.get(i).get("type"),type)){continue;}
String temp = "<node type=\""+list.get(i).get("type")+"\" label=\""
+list.get(i).get("name")+"\" id=\""+list.get(i).get("id")+"\"></node>";
result.append(temp);
}
result.append(endnode);
return result.toString();

这个树自己写了好几天，虽然不是很难，但对于我，已经是一个成果了，其实只要努力的找，网上还是有答案的