call object per string

[nimo frey]

I have a common js-object:

var TEST = { a: "1", b: "2" }

I know, I can call property a via TEST.a or via TEST['a'].

I want to do something like this:

['TEST'].a

But it does not work. How can I do that? Should I use eval or call() or something?

[Eric Pascarello]

Never use eval.

It would be better if you namespaced it and not make it a global variable.

var myObj = {};
myObj.TEST = {
    a: "1",
    b: "2"
};

console.log( myObj["TEST"].a );

but if you have a thing against using the namespace, you can always use window

var TEST = {  
    a: "1",  
    b: "2"  
} 

console.log( window["TEST"].a );

Eric

[nimo frey]

Thanks it works, but I how do I solve that, when using module-pattern:

var myModule= (function() { var Submodule= { do: function(){ console.log("do called"); } })();

I want to call Submodule by string:

Something like myModule['Submodule'].do();

does not work.

[Eric Pascarello]

Becuase you are storing a result of a function to a variable and the function is not returning anything to store in that variable.

Eric

[nimo frey]

Oh, so should I do something like that:


var myModule= (function() { Submodule: { do = function(){ console.log("do called"); } })();

Is this better ?

[Eric Pascarello]

That code appears to be the same as it was before.

Your code is the same as:

var foo = (function(){ })(); console.log( foo );

All of the stuff inside is local variables, there are no way you can access them.

If you want something to be accessed outside of it, you would have to return it.

var foo = (function(){ var msg = "hi"; var bar = function() { alert( msg ); }; return bar; })(); console.log( foo() );