I have already set a variable in my document class "Main.as". I am now trying to access that variable and read its value from a different Class and Function, take that value and email it.
For example in my "Main.as" file I have this function:
public var _myVar:String;
function create() {
_myVar = "hello";
}
Now from my other class "EmailtoFriend.as" I have a new function to try and get the value of that pre set variable:
function getVar() {
trace(_myVar);
}
Why will it not output "hello"? Instead I get an error saying: Access of undefined property _myVar. If I could just get this simple example working, I think it will help me understand a lot of things. Thanks!
The error your getting really says it all. Although _myVar is defined in your Main class public var _myVar:String;, it isn't defined in your Emailtofriend class. If you want access to _myVar you need to do one of the following:
Parse a reference of your Main object(using this) to your EmailToFriend class:
Main.as(document class):
package
{
import flash.display.Sprite;
import flash.events.Event;
public class Main extends Sprite
{
public var _myVar:String;
public function Main():void
{
if (stage) init();
else addEventListener(Event.ADDED_TO_STAGE, init);
}// end function
public function create():void
{
_myVar = "hello";
}// end function
private function init(e:Event = null):void
{
removeEventListener(Event.ADDED_TO_STAGE, init);
create();
var emailToFriend:EmailToFriend = new EmailToFriend(this);
emailToFriend.getVar();
}// end function
}// end class
}// end package
internal class EmailToFriend
{
private var _main:Main;
public function EmailToFriend(main:Main)
{
_main = main;
}// end function
public function getVar():void
{
trace(_main._myVar);
}// end function
}// end class
Or to make _myVar a public static property of Main and access it via Main._myVar:
Main.as(document class):
package
{
import flash.display.Sprite;
import flash.events.Event;
public class Main extends Sprite
{
public static var _myVar:String;
public function Main():void
{
if (stage) init();
else addEventListener(Event.ADDED_TO_STAGE, init);
}// end function
public function create():void
{
_myVar = "hello";
}// end function
private function init(e:Event = null):void
{
removeEventListener(Event.ADDED_TO_STAGE, init);
create();
var emailToFriend:EmailToFriend = new EmailToFriend();
emailToFriend.getVar();
}// end function
}// end class
}// end package
internal class EmailToFriend
{
public function EmailToFriend() {}
public function getVar():void
{
trace(Main._myVar);
}// end function
}// end class
Also one small thing, when using underscores for class properties, you should only use them for private properties, not public. Well I say only but I really mean it's more common.
[UPDATE]
This is in response to your comment:
Main.as:
package
{
import EmailToFriend;
import flash.display.Sprite;
import flash.events.Event;
public class Main extends Sprite
{
public static var _myVar:String;
public function Main():void
{
if (stage) init();
else addEventListener(Event.ADDED_TO_STAGE, init);
}// end function
public function create():void
{
_myVar = "hello";
}// end function
private function init(e:Event = null):void
{
removeEventListener(Event.ADDED_TO_STAGE, init);
create();
var emailToFriend:EmailToFriend = new EmailToFriend();
emailToFriend.getVar();
}// end function
}// end class
}// end package
EmailToFriend.as:
package
{
import Main;
public class EmailToFriend
{
public function EmailToFriend() {}
public function getVar():void
{
trace(Main._myVar);
}// end function
}// end class
}// end package