Replace text in RichTextEditor with TextRange

     

<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" width="600"
    height="500">
    <mx:Script>
        import mx.controls.textClasses.TextRange;
        [Bindable]
        
        public var htmlData:String="<textformat leading='2'><p align='center'><b><font size='20'>HTML Formatted Text</font></b></p></textformat>";
        public function changeSelectionText():void {
            var sel:TextRange = rte1.selection;
            var selLength:int = sel.endIndex - sel.beginIndex;
            if (selLength) {
                sel.text="This is replacement text. "
                sel.color="fuchsia";
                sel.fontSize=20;
                sel.fontFamily="courier"

                t1.text+="\n\nNew text length: " + String(sel.endIndex - sel.beginIndex);
                t1.text+="\nNew Font Family: " + sel.fontFamily;
                t1.text+="\nNew Font Size: " + sel.fontSize;
                t1.text+="\nNew Font Color: " + sel.color;                
            }
        }
      </mx:Script>
    <mx:RichTextEditor id="rte1" htmlText="{htmlData}" width="100%"
        height="100%" mouseUp="changeSelectionText()" />
    <mx:TextArea editable="false" id="t1" fontSize="12"
        fontWeight="bold" width="300" height="180" />
</mx:Application>

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Replace text in RichTextEditor with TextRange : RichTextEditor « Components « Flex

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