Flash AS3 Global Variables?

Question

HI i have a main class

//main.as

package {
    public class main {
     public var testGlobal:string = "testValue";

    }
}


//pop.as

package {
    public class pop {
     function pop():void {
      trace("testGloabl from main.as" + testGlobal);
     }
    }
}

How can i get the testGlobal value on pop.as width out using a main class Object. Is there any method of Global variables??

How to use global variables in AS3 .

Answer 1

testGlobal is not a global variable, it is a public instance variable of the Main class. You cannot access it without using a Main class object, because without an object there is no existence for a property. Instance variables are tied to objects.

If you want to access create a property that is not tied to any particular object instance, declare it as static.

//Main.as
package {
    public class Main {
        public static var testGlobal:string = "testValue";
    }
}


//Pop.as
package {
    public class Pop {
        function pop():void {
                trace("testGloabl from Main.as" + Main.testGlobal);
        }
    }
}

Answer 2

If you absolutely positively have to have a global variable in as3, you could always create a file in the top-level of your source folder like this:

MULTIPLIER.as

package
{
    public var MULTIPLIER:int = 3;
}

Then, whenever you need your multiplier you could reference wherever you need it like this:

DoSomeMultiplying.as

package multiplying
{
    public class DoSomeMultiplying
    {
        public function multiplyMe(n:int):int
        {
            var m:int = n * MULTIPLIER;
            MULTIPLIER = m;
            return m;
        }
    }
}

However, I would strongly recommend that you do not do this! it is horribly bad practice, horribly slow and, well, just horrible!

But there it is, it is possible to create a global variable or constant in the default package to act as a global constant or variable.

Answer 3

You can use the static, like it was said before, or you can use the Singleton pattern. There are no private constructors in AS, so what you can do is: a) be very carefull not to call the constructor b) send an exception everytime someone calls the constructor and the instance has already been set.

I don't think there are actual global variables - but I don't see why you would need any. If you want a variable in class to be modifiable from the outside just declare it static then do className.variableName = .

Answer 4

I agree with what the others just said, avoid global variables, prefer constant (and usually constants are not meant to be changed)

Answer 5

Thanks for this post.