A url property on the HTTPService component

      
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
  verticalGap="20">
  <mx:Script>
    
    import mx.utils.ArrayUtil;
  </mx:Script>
  <mx:HTTPService id="employeeSrv" url="employees.jsp">
    <mx:request>
      <deptId>{dept.selectedItem.data}</deptId>
    </mx:request>
  </mx:HTTPService>
  <mx:ArrayCollection id="employeeAC" source="{ArrayUtil.toArray(employeeSrv.lastResult.employees.employee)}" />
  <mx:HBox>
    <mx:ComboBox id="dept" width="150">
      <mx:dataProvider>
        <mx:ArrayCollection>
          <mx:source>
            <mx:Object label="A" data="A para" />
            <mx:Object label="B" data="B para" />
            <mx:Object label="C" data="C para" />
          </mx:source>
        </mx:ArrayCollection>
      </mx:dataProvider>
    </mx:ComboBox>
    <mx:Button label="Get" click="employeeSrv.send();" />
  </mx:HBox>
  <mx:DataGrid dataProvider="{employeeAC}" width="100%">
    <mx:columns>
      <mx:DataGridColumn dataField="name" headerText="Name" />
      <mx:DataGridColumn dataField="phone" headerText="Phone" />
      <mx:DataGridColumn dataField="email" headerText="Email" />
    </mx:columns>
  </mx:DataGrid>
</mx:Application>

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A url property on the HTTPService component : HTTPService « Data Model « Flex

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