Use Web service to validate input

         
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
  <mx:Script>
    
        import mx.rpc.events.ResultEvent;
        import mx.rpc.events.FaultEvent;
        import mx.rpc.soap.LoadEvent;
        import mx.controls.Alert;

        private function loadHandler(event:LoadEvent):void {
            trace(event.wsdl.xml);
        }

        private function resultHandler(event:ResultEvent):void {
            trace(event.result as String);
        }

        private function faultHandler(event:FaultEvent):void {
            Alert.show(event.fault.faultString);
        }

  
  </mx:Script>

  <mx:WebService id="myWebService" 
                 wsdl="http://server.com/service.php?WSDL" 
                 load="loadHandler(event)"
               result="resultHandler(event)" 
               fault="faultHandler(event)" />

  <mx:Button id="myButton" label="OK" click="myWebService.valid('not a number')" />
</mx:Application>

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Use Web service to validate input : WebService « Data Model « Flex

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