How to capture when the HTTPService call gets finished

Question

When I add a item into datagrid, I want the item
is added into database successfully and capture the return message , and then I refresh the datagrid.
But, the message is empty since the HTTPService call has not finished. How do make it waits until the call is finished?
Thank you in advance!

Answer 1

Thank you for your response.
I have handlers for both result and fault, but I do not know which
parameter to tell the call is end.
For example,
    I call sendData on a.mxml and the HTTPService call and result/fault handler are in b.as.
            I do :
  in a.mxml,
            private  function addInactive():void{
           var selectedPerson:Object = new Object;
           addTopersonEvent.addToInactive(selectedPerson);           
           if (Application.application.getSelectedEvent.indexOf("Error") < 0)
               this.peopleInActivity.addItem(inActivePerson);
              this.peopleInActivity.refresh();
  in b.as       
            public function sendhttpResult(event:ResultEvent):void {
            Application.application.getSelectedEvent = event.result.sendresultmsgs.sendresultmsg.message;
            trace(" in tr " + Application.application.getSelectedEvent);
           Alert.show(event.result.sendresultmsgs.sendresultmsg.message,'SENT RESULT:');
          I can see the Application.application.getSelectedEvent value is "Error   xxxxxxx" in b.as, but
          in a.mxml , the Application.application.getSelectedEvent  is null.
         How to I make it wait until the result back then
        do the test Application.application.getSelectedEvent.indexOf("Error") < 0