flex Tree xmlNode jsonData,更换treeData

?<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical" initialize="initTree()" > ??? <mx:Script> ??????? <![CDATA[ ??????? import mx.controls.Alert; ??????????? [Bindable] ??????????? public var open:Object = new Object(); ??????????? [Bindable] ??????????? public var refreshData:Boolean = false; ??????????? [Bindable] ??????????? public var switchObj:Object = new Object(); ??????????? [Bindable] ??????????? public var firstObj:Object = new Object(); ??????????? [Bindable] ??????????? public var firstObj1:Object = new Object(); ??????????? [Bindable] ??????????? public var firstObj2:Object = new Object(); ??????????? [Bindable] ??????????? public var provider:String = "firstObj"; ??????????? private function initTree():void ??????????? { ??????????????? firstObj = new Object(); ??????????????? firstObj.label = "Foods"; ??????????????? firstObj.children = new Array(); ??????????????? firstObj1.label = "Fruits"; ??????????????? firstObj1.children = new Array(); ??????????????? firstObj2.label = "Oranges"; ??????????????? firstObj1.children[0] = firstObj2; ??????????????? firstObj.children[0] = firstObj1; ??????????????? switchObj = [ ??????????????? {label:'root1',children:[{label:"firstChilden"},{label:"secondChild"}]} ???????????????,??????????????? {label:'root2',{label:"secondChild"}]} ??????????????? ]; ??????????? } ??????????? public function changeProvider():void ??????????? { ??????????????? open = SampleTree.openItems; ??????????????? refreshData = true; ??????????????? if (provider == "firstObj") ??????????????? { ??????????????????? SampleTree.labelField="label"; ??????????????????? provider = "switchObj"; ??????????????????? SampleTree.dataProvider = switchObj; ??????????????? } ??????????????? else if (provider == "switchObj") ??????????????? { ??????????????????? provider = "xmlObj"; ??????????????????? SampleTree.labelField="@label"; ??????????????????? SampleTree.dataProvider = treeData; ??????????????? } ???????????????? else if (provider == "xmlObj") ??????????????? { ??????????????????? provider = "firstObj"; ??????????????????? SampleTree.labelField="label"; ??????????????????? SampleTree.dataProvider = firstObj; ??????????????? } ??????????? } ??????????? public function renderTree():void{ ??????????????? if(refreshData){ ??????????????????? // Refresh all rows on next update. ??????????????????? SampleTree.invalidateList(); ??????????????????? refreshData = false; ?????????????????? SampleTree.openItems = open; ??????????????????? // Validate and update the properties and layout ??????????????????? // of this object and redraw it,if necessary. ??????????????????? SampleTree.validateNow(); ??????????????? } ??????????? } ??????? ]]> ??? </mx:Script> ??????? <mx:XMLList id="treeData"> ??? <node label="Mail Box"> ??????? <node label="Inbox"> ??????????? <node label="Marketing"/> ??????????? <node label="Product Management"/> ??????????? <node label="Personal"/> ??????? </node> ??????? <node label="Outbox"> ??????????? <node label="Professional"/> ??????????? <node label="Personal"/> ??????? </node> ??????? <node label="Spam"/> ??????? <node label="Sent"/> </node> ??? </mx:XMLList> ??? <mx:Tree id="SampleTree" render="renderTree()"? showRoot="true"? width="250" dataProvider="{firstObj}" labelField="label" /> ??? <mx:Button label="Change Data Provider" click="changeProvider()"/> </mx:Application>