maxChars sets the maximum number of characters that a TextField can contain

 
package{
  import flash.display.Sprite;
  import flash.text.*;
  public class Main extends Sprite{
    public function Main(){
      var field:TextField = new TextField(  );
        field.maxChars = 12;
        field.type = flash.text.TextFieldType.INPUT;
        field.border = true;
        field.background = true;
        addChild(field);

        
    }
  }
}

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maxChars sets the maximum number of characters that a TextField can contain : Filter « TextField « Flash / Flex / ActionScript

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