To select all text in a text control, use the selectAll() method

          

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<!-- sparktextcontrols/SelectAllExample.mxml -->
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
    xmlns:mx="library://ns.adobe.com/flex/mx"
    xmlns:s="library://ns.adobe.com/flex/spark">
    <s:layout>
        <s:VerticalLayout />
    </s:layout>
    <fx:Script>
         
            private function selectText(e:Event):void { 
                 e.currentTarget.selectAll(); 
            } 
          
    </fx:Script>
    <s:TextArea id="sparkTextArea" text="Spark TextArea control."
        focusIn="selectText(event)" />
    <s:TextInput id="sparkTextInput" text="Spark TextInput control."
        focusIn="selectText(event)" />
</s:Application>

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To select all text in a text control, use the selectAll() method : Text « Components « Flex

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