Constructor argument error - actionscript-3

Question

my english is poor because this is not my main language but i'll do my best.
I need help with the argument to the constructor because i dont know where to take all these information.
here my defaultitem class:
public class DefaultItem extends MovieClip
{
private var _id:String;
private var _lastX:int;
private var _lastY:int;
private var _isStackable:Boolean = false;
private var _type:String;
private var _isDragging:Boolean = false;
private var _currentContainer:DefaultContainer;
private var _lastContainer:DefaultContainer;
public function DefaultItem($id:String, $type:String, $x:int, $y:int)
{
stop();
id = $id;
type = $type;
x = $x;
y = $y;
addEventListener(Event.ADDED_TO_STAGE, onAddedToStage);
}
private function onAddedToStage(e:Event):void
{
removeEventListener(Event.ADDED_TO_STAGE, onAddedToStage);
init();
}
public function init():void
{
buttonMode = true;
mouseChildren = false;
_lastX = x;
_lastY = y;
addEventListener(MouseEvent.MOUSE_UP, onMouseUpHandler);
addEventListener(MouseEvent.MOUSE_DOWN, onMouseDownHandler);
this.stage.addEventListener(MouseEvent.MOUSE_UP, onMouseUpHandler);
//resolve drag bugs
}
/**
* Mouse Event Handlers
*/
private function onMouseDownHandler(e:MouseEvent):void
{
isDragging = true;
this.mouseEnabled = false;
dispatchEvent(new ItemEvent(ItemEvent.ITEM_PICKED_UP, this));
}
private function onMouseUpHandler(e:MouseEvent):void
{
// check if item is being dragged
if (isDragging)
{
isDragging = false;
this.mouseEnabled = true;
dispatchEvent(new ItemEvent(ItemEvent.ITEM_DROPPED, this));
}
}
/**
* Getters & Setters
*/
public function get id():String { return _id; }
public function set id(value:String):void
{
_id = value;
}
public function get lastX():int { return _lastX; }
public function set lastX(value:int):void
{
_lastX = value;
}
public function get lastY():int { return _lastY; }
public function set lastY(value:int):void
{
_lastY = value;
}
public function get currentContainer():DefaultContainer { return _currentContainer; }
public function set currentContainer(value:DefaultContainer):void
{
_currentContainer = value;
}
public function get lastContainer():DefaultContainer { return _lastContainer; }
public function set lastContainer(value:DefaultContainer):void
{
_lastContainer = value;
}
public function get type():String
{
return _type;
}
public function set type(value:String):void
{
_type = value;
}
public function get isDragging():Boolean
{
return _isDragging;
}
public function set isDragging(value:Boolean):void
{
_isDragging = value;
}
/**
* Destroys item
*/
public function destroy():void
{
buttonMode = false;
removeEventListener(MouseEvent.MOUSE_UP, onMouseUpHandler);
removeEventListener(MouseEvent.MOUSE_DOWN, onMouseDownHandler);
this.stage.removeEventListener(MouseEvent.MOUSE_UP, onMouseUpHandler);
}
}
}
here my item class:
public class Slot extends DefaultContainer
{
// vars
private var _id:String;
private var _item:DefaultItem;
private var _type:DefaultItem;
//private var isdragging:DefaultItem;
public var defaultitem:DefaultItem = new DefaultItem(id, _type, x, y);
// trace(DefaultItem.getisDragging());
//trace(DefaultItem.getisDragging());
/**
* Constructor
*
* #param $id Slot id
*/
public function Slot($id:String)
{
addEventListener(MouseEvent.ROLL_OUT, onMouseOutHandler);
addEventListener(MouseEvent.ROLL_OVER, onMouseOverHandler);
id = $id;
setLabel($id);
stop();
}
/**
* Slot Methods
*/
public function getItem():DefaultItem { return _item; }
public override function addItem($item:DefaultItem):void
{
_item = $item;
addChild(_item);
//
this.gotoAndStop(2); //active slot
}
public override function removeItem($item:DefaultItem):void
{
removeChild(_item);
_item = null;
this.gotoAndStop(1); //default slot
}
public function hasItem():Boolean
{
if (_item == null)
{
return false;
}
else
{
return true;
}
}
private function onMouseOutHandler(e:MouseEvent):void {
trace("mouseOutHandler");
this.gotoAndPlay("out");
}
private function onMouseOverHandler(e:MouseEvent):void {
trace("mouseoverHandler");
// if (!isDragging)
//{
//trace("drag = "+ isDragging);
this.gotoAndPlay("over");
// }
//else {
//trace("drag = " + isDragging );
//this.gotoAndPlay("dragUp");
// }
}
/**
* Getters & Setters
*/
public function get id():String { return _id; }
public function set id(value:String):void
{
_id = value;
}
public function setLabel($label:String):void
{
this.label.text = $label;
}
/**
* Destroy
*/
public function destroy():void
{
removeItem(_item)
}
}
}
the problem is here public var defaultitem:DefaultItem = new DefaultItem(id, _type, x, y);
i'm not sure id and _type is working good. I wanna know where to get all these information because i need to call the function isdragging and if i use the var id he target the item and not the defaultcountainer id thanks guys

Answer 1

You are creating and instance of DefaultItem but passing wrong arguments.
public var defaultitem:DefaultItem = new DefaultItem(id, _type, x, y);
Since this is created prior to constructor running, id is null, _type is not a String and is null and x, y are out of scope.
It should be:
public var defaultitem:DefaultItem;
Then in Slot constructor:
id = $id;
defaultitem = new DefaultItem(id, _type, x, y);
//but _type is still not a String and is still null

Answer 2

It seems to me like you're dragging an item onto something, sorry if I've misunderstood.
But, in that case, you can use something like:
var itemID:String = e.target.id;
var itemType:String = e.target._type;
That's in case you have the item's id and type stored somewhere.
Also, as for the x and y, those depend on where you want to put them.
For example, if you had a character and you wanted to give him a sword, it would look something like:
//somewhere in your code:
weapon.id = "Iron Sword";
weapon._type = "Sword";
//And then when you get to the default item part...
var itemId:String = e.target.id;
var itemType:String = e.target._type;
var defaultitem:DefaultItem = new DefaultItem(itemID,itemType, character.x, character.y);
Again, sorry if I misunderstood. Best of luck with your program!