Flex/Actionscript: Dynamically accessing static var

Question

Let's say that I have a class Foo:

public class Foo
{

   public static var bar:String = "test";

}

How can I reference bar at runtime using the string "Foo" or/and and instance of Foo and the string "bar"?

I.e.

var x:Object = new Foo();
...
x["bar"]

...doesn't work, debug mode in IntelliJ got my hopesup as bar gets listed as a property.

Update:

Note that at the "point of action" I don't know anything about foo in compile time. I need to resolve Foo.bar through the strings "Foo" and "bar".

Of put differently, as flex don't have eval how can I accomplishe the same as eval("Foo.bar")?

Ah, I see what you mean now. I've updated my answer below.

Christian Nunciato
– Christian Nunciato

2009-01-19 21:30:53 +00:00
Commented Jan 19, 2009 at 21:30 — Christian Nunciato
– Christian Nunciato, Commented Jan 19, 2009 at 21:30

Christian Nunciato · Accepted Answer · 2009-01-19 21:30:18Z

6

It's a static variable, so you won't be able to access it using an instance of foo; it's accessed statically, using ClassName.variableName notation, like so:

trace(Foo.bar);

// yields: "test"

As well, because you've declared both Foo and bar public, you should be able to access Foo.bar that way from anywhere in your application.

Update: Ah, I see what you're asking. You can use flash.utils.Summary.getDefinitionByName():

// Either this way
trace(getDefinitionByName("Foo").bar);

// Or this
trace(getDefinitionByName("Foo")["bar"]);

... the latter thanks to Jeremy's answer, which was new to me. :)

edited Jan 19, 2009 at 21:30

answered Jan 19, 2009 at 19:06

Christian Nunciato

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Comments

user53939 · Accepted Answer · 2009-01-19 19:30:50Z

4

"bar" is a static variable, so you need to access it through the class instead of an instance of the class.

trace(Foo.bar); // "test"

If by dynamically accessing the variable, you mean accessing it with a string name, then you want to do that through the class as well.

trace(Foo["bar"]); // "test"

answered Jan 19, 2009 at 19:30

user53939

1 Comment

Christian Nunciato Over a year ago

Nice -- I didn't know it could be referenced as Foo["bar"] as well.

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