Rails spinoffs - Sep 2007 - Prototype.js and Coremetrics eluminate.js issues

Hi,

I am trying to use prototype.js on a JSP that also contains some
javascript from Coremetrics (eluminate.js). Coremetrics is used for
tracking marketing clicks.

When I have both of these javascript imports on the page I get
javascript errors in the eluminate.js file. I get javascript errors
that say "Undeterminate string constant."

It looks like the prototype.js file is somehow messing up the
javascript code in eluminate.js.

It is taking code like:

img.onload=new
Function("if(c6)c6(''"+host+"'',"+i
+");");}else{img.onload=new
Function("if(C0)C0("+i+");");}

and turning it into:

if(c6)c6(''function (iterator) {

It seems like the values coming in for param "host" is not correct it
is now somehow a method call...which has line breaks and I believe
this is what is causing the "Undeterminate string constant" error. but
how is prototype.js messing up that host variable.

Anyone have any ideas what could be going on?


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I''m gonna shoot in the dark here, but I guess that host there comes
from
doing something like

for (var i in someArray) {
  ...
  var host = someArray[i];
  ...
  img.onload = new Function(...)
  ...
}

Now, if that''s the case, then it''s a problem on Coremetrics
code. using
for...in iterates over the object visible properties. It just happens that
Array''s visible properties coincide with its elements''
indexes, so a lot of
naive js programmers think that they can do for...in to iterate over an
array (I know I did :)).

But Prototype extends Array to add all the nice Enumerable methods (each,
map, inject, first, etc), which ends up meaning that for...in, instead of
doing

for ({ 0, 1, 2, 3, 4 } in myArray)

does something like

for ({ 0, 1, 2, 3, 4, "_each", "each", "map".... }
in myArray)

which produces the behavior you''re observing.

You should let Coremetrics know they''re at fault with their code and
that
they should improve.

Best,
-Nicolas
On 9/12/07, brian <brianlschultz-uAjRD0nVeow@public.gmane.org>
wrote:
>
>
> Hi,
>
> I am trying to use prototype.js on a JSP that also contains some
> javascript from Coremetrics (eluminate.js). Coremetrics is used for
> tracking marketing clicks.
>
> When I have both of these javascript imports on the page I get
> javascript errors in the eluminate.js file. I get javascript errors
> that say "Undeterminate string constant."
>
> It looks like the prototype.js file is somehow messing up the
> javascript code in eluminate.js.
>
> It is taking code like:
>
> img.onload=new
Function("if(c6)c6(''"+host+"'',"+i
> +");");}else{img.onload=new
Function("if(C0)C0("+i+");");}
>
> and turning it into:
>
> if(c6)c6(''function (iterator) {
>
> It seems like the values coming in for param "host" is not
correct it
> is now somehow a method call...which has line breaks and I believe
> this is what is causing the "Undeterminate string constant"
error. but
> how is prototype.js messing up that host variable.
>
> Anyone have any ideas what could be going on?
>
>
> >
>
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Howdy,

This is an issue that we know about and have a fix available for (I
work at Coremetrics).  It just involves a newer version of the
eluminate.js library.

You can get in touch with the Coremetrics Customer Support group
(support-6rJ9xhWzvN05UWNf+nJyDw@public.gmane.org) to request the most up-to-date
version of
eluminate.  If you are an employee of the company using Coremetrics,
we can give it to you directly.  If you are fro ma third party
company, please have the client contact support.

I hope that helps.

- Eliot -



As as aside, this code was written 4+ years ago, so this wasn''t an
issue until prototype.js started being used.  That''s part of the fun
of web development - ever moving targets!  :-)


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