Note: How To Retrieve Variables From Function To Another

demolaynyc

Nov 26 2006, 05:39 AM

I have been having troubles with this but I found out a solution to this. The problem is to declare variables inside a function and retrieve its value from another function--but that doesn't work.

Here is an example of the wrong thing to do:

CODE

function firstFunc () {
var aVariable = oneValue;
}

function getVariable () {
trace (aVariable);
}

The trace would return (undefined) because it is undefined in that exact function.

Solution:
do not declare variables inside a function. If you have to, use _root.variableName instead of var variable Name

Here's a sample code:

CODE

function firstFunc () {
_root.aVariable = oneValue;
}

function getVariable() {
trace(_root.aVariable);
}

So, tell me what you think. And if there's a better alternative please do post it.

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seec77

Nov 26 2006, 11:45 AM

I'm not sure, but I think you can also do something like this:

CODE

var aVariable;

function firstFunc() {
aVariable = oneValue;
}

function getVariable() {
trace(aVariable);
}

I don't have Flash right now to test this, but I'm guessing it should work (it works in plain ol' Javascript, so I don't forsee a problem - it's nothing special to Flash, merely programming semantics). Setting the variable as a member of "_root" is OK, but not necessarily that "correct" programatically, and I think that this method is better.

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demolaynyc

Mar 22 2007, 05:12 PM

LOL. Wow, looking back to this it just shows how much of a novice I was at AS and this was pretty recent. Yep, your code should work. The best method is yours (declaring the variable outside the functions.

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Quatrux

Mar 23 2007, 05:39 AM

Another solution would be to use a Class for those kind of things, usually if you want other variables work in other function, you create a Class, so the basic example is:

CODE

class MyClass {

    var $var1 = '';

    function myFunction1() { $this->var1 = 'Value'; }

    function myFunction2() { return $this->var1; }

}

$MyClass = new MyClass;

echo $MyClass->myFunction2(); // Value

So you can access and manage all the variables using $this->var1; In fact, sometimes using a Class is very comfortable, to play with functions

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demolaynyc

Mar 24 2007, 02:53 AM

Hey Quatrux, is that Actionscript or PHP? It looks to me like PHP. Well, it can be converted to AS easily anyway. wait, I noticed here:

" $MyClass = new Database "

why would you make a new "Database" rather than "MyClass"? JW

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lonelym

Jul 9 2007, 10:40 AM

Use the _root.NAMEOFVARIABLE so that you can grab it later on. Hope it helps.

function myFunction1() { _root.this = 'Value'; }

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