一、HTTPService

程序代码：

<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" initialize="initializeHandler(event)"> <mx:Script> <!--[CDATA[ private function initializeHandler(event:Event):void { countriesService.send(); } private function changeHandler(event:Event):void { statesService.send(); } ]]> </mx:Script> <!-- 载入纯静态的xml数据 --> <mx:HTTPService id="countriesService" url="http://www.rightactionscript.com/states/xml/countries.xml" /> <!-- 载入由php生成的xml数据 --> <mx:HTTPService id="statesService" url="http://www.rightactionscript.com/states/xml/states.php"> <!-- 以下标签就是要发送到服务端的数据了,可以这样理解:有一个名为country的变量,它的值为花括号{}里的内容 --> <mx:request> <country>{country.value}</country> </mx:request> </mx:HTTPService> <mx:VBox> <!-- 此控件的数据由第一个<mx:HTTPService/>控件接收的内容提供,并且由这个ComboBox控制着第二个ComboBox所要 显示的内容 --> <mx:ComboBox id="country" dataProvider="{countriesService.lastResult.countries.country}" change="changeHandler(event)" /> <!-- 下面的ComboBox已经绑定了{statesService.lastResult.states.state},随它的数据改变而改变 --> <mx:ComboBox dataProvider="{statesService.lastResult.states.state}" /> </mx:VBox> </mx:Application>

二、URLLoader

程序代码：

<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" initialize="initializeHandler(event)"> <mx:Script> <!--[CDATA[ private var _countriesService:URLLoader; private var _statesService:URLLoader; private function initializeHandler(event:Event):void { _countriesService = new URLLoader(); _countriesService.addEventListener(Event.COMPLETE, countriesCompleteHandler); _countriesService.load(new URLRequest("http://www.rightactionscript.com/states/xml/countries.xml")); _statesService = new URLLoader(); _statesService.addEventListener(Event.COMPLETE, statesCompleteHandler); XML.ignoreWhitespace = true; } private function countriesCompleteHandler(event:Event):void { var xml:XML = new XML(_countriesService.data); country.dataProvider = xml.children(); } private function statesCompleteHandler(event:Event):void { var xml:XML = new XML(_statesService.data); state.dataProvider = xml.children(); } private function changeHandler(event:Event):void { var request:URLRequest = new URLRequest("http://www.rightactionscript.com/states/xml/states.php"); var parameters:URLVariables = new URLVariables(); parameters.country = country.value; request.data = parameters; _statesService.load(request); } ]]--> </mx:Script> <mx:VBox> <mx:ComboBox id="country" change="changeHandler(event)" /> <mx:ComboBox id="state" /> </mx:VBox> </mx:Application>

三、WebService 方法一

程序代码：

<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" initialize="initializeHandler(event)"> <mx:Script> <!--[CDATA[ private function initializeHandler(event:Event):void { statesService.getCountries(); } private function changeHandler(event:Event):void { statesService.getStates(country.value); } ]]--> </mx:Script> <mx:WebService id="statesService" wsdl="http://www.rightactionscript.com/states/webservice/StatesService.php?wsdl"> <mx:operation name="getCountries" /> <mx:operation name="getStates" /> </mx:WebService> <mx:VBox> <mx:ComboBox id="country" dataProvider="{statesService.getCountries.lastResult}" change="changeHandler(event)" /> <mx:ComboBox dataProvider="{statesService.getStates.lastResult}" /> </mx:VBox> </mx:Application>

四、WebService 方法二

程序代码：