package { import flash.display.Sprite; import flash.text.TextField; import flash.text.TextFieldType; import flash.events.TextEvent; import flash.events.TextEvent; public class Main extends Sprite { private var _field:TextField = new TextField( ); public function Main( ) { _field.border = true; _field.background = true; _field.type = TextFieldType.INPUT; addChild(_field); _field.addEventListener(TextEvent.TEXT_INPUT, onTextInput); } private function onTextInput(event:TextEvent):void { if(event.text == "a" && _field.length == 0) { event.preventDefault( ); } } }}
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