Clicking button using keyboard in AS3 - actionscript-3

Question

I am trying to do this by clicking on button using 'A' key in keyboard. I created two frames for this button but the code doesn't work, although there is no error.
Do I need to put anything in my main class? Can anyone help to fix this?
package {
import flash.display.MovieClip;
import flash.events.MouseEvent;
import flash.display.Sprite;
import flash.display.Stage;
import flash.events.Event;
import flash.events.KeyboardEvent;
import flash.ui.Keyboard;
public class controlButton extends MovieClip {
public function controlButton() {
// constructor code
this.addEventListener(KeyboardEvent.KEY_DOWN,clickDown);
this.addEventListener(KeyboardEvent.KEY_UP,clickUp);
}
public function clickDown(event:KeyboardEvent):void{
// if the key is A
if(event.charCode == 65){
this.gotoAndStop(2);
}
}
public function clickUp(event:KeyboardEvent):void{
// if the key is A
if(event.charCode == 65){
this.gotoAndStop(1);
}
}
public function changelabel(newLabel:String):void{
this.label.text = newLabel;
}
}
}

Answer 1

Your button will never receive any KeyboardEvent. You should add your event listeners directly to the stage. Of course, you have to obtain a link to the stage. Anyways:
package {
import flash.display.MovieClip;
import flash.events.MouseEvent;
import flash.display.Sprite;
import flash.display.Stage;
import flash.events.Event;
import flash.events.KeyboardEvent;
import flash.ui.Keyboard;
public class controlButton extends MovieClip {
public function controlButton() {
// constructor code
addEventListener(Event.ADDED_TO_STAGE, onAddedToStage);
}
private function onAddedToStage (e:Event):void
{
removeEventListener(Event.ADDED_TO_STAGE, onAddedToStage);
//stage is no longer null here
stage.addEventListener(KeyboardEvent.KEY_DOWN,clickDown);
stage.addEventListener(KeyboardEvent.KEY_UP,clickUp);
}
public function clickDown(event:KeyboardEvent):void{
// if the key is A
if(event.charCode == 65){
this.gotoAndStop(2);
}
}
public function clickUp(event:KeyboardEvent):void{
// if the key is A
if(event.charCode == 65){
this.gotoAndStop(1);
}
}
public function changelabel(newLabel:String):void{
this.label.text = newLabel;
}
}
}
As you can see, you should add KeyboardEvent listeners to the stage right after the Event.ADDED_TO_STAGE fires.