Use a change event to show slider value in a TextArea control

      
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
    <mx:Script>
        
        import mx.events.SliderEvent;
        import mx.controls.sliderClasses.Slider;
        
        private function sliderChange(event:SliderEvent):void {
            var currentSlider:Slider=Slider(event.currentTarget);
            thumb.text=String(currentSlider.value);
        }
      
    </mx:Script>
    <mx:HSlider change="sliderChange(event);" />
    <mx:TextArea id="thumb" />
</mx:Application>

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Use a change event to show slider value in a TextArea control : Slider « Components « Flex

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