Scroll Event issue with HScrollBar

[Ravi]

Hello Friends,
I am using HscrollBar in my application.
In which on Scroll event i am calling (webService) some function.
But this function get call multiple times because Scroll event.
because of that i didnt get response in quick time and gets error
Channel Disconnected.
I want to call this function once at mouse down.but MouseDown events
get fire only if mouse pointer is on HScrollBar.and also i didnt get
scroll position on MouseDown event. It only gets in OnScroll Event.
can somebody please help me in this...

thanks in advance
ravi

[Ravi]

[Shobita]

Remove the event listener in the handler. You can add it again later

private function onScroll(event:Event):void
{
event.currentTarget.removeEventListener(ScrollEvent.SCROLL,
onScroll);

// webService call
}

Make sure you add the event lister in AS and not mxml.

[Ravi]

thanks for reply shobita,
can you please explain me in detail....Because if we remove the
listener then also it will hit webService call again n again on
scroll.Please correct me if i am wrong..waiting 4 ur reply

thanks in advance
ravi

[Shobita]

Since you will be calling the webService inside the event handler, it
will be called only the 1st time. There after the handler will not be
invoked.