From: Marnen Laibow-Koser <marnen@...>
Date: 2009-11-26T00:42:56+09:00
Subject: Re: Help with meta programming

Sean Shillo wrote:
> I came across the following code in a class called Marker
> 
> def when_dropped
>   self.listen_to :event => :dragend do |script|
>     script << "drop_location = #{self.var}.getLatLng();"
> 
>     yield script, :drop_location
>   end
> end
> 
> if i use the function as follows
> 
> marker.when_dropped do |script, drop_location|
> logger.info(drop_location)
> end
> 
> all i get is "drop_location".

Right -- because the parameter is the literal value :drop_location, not 
a variable.

> I want drop_location to be evaluated to
> get the value from #{self.var}.getLatLng() and I can't seem to find a
> way to do this, anyone have any ideas and/or know

The getLatLng looks like it's JavaScript, not Ruby.  I'm assuming this 
is in the context of RJS or something that builds JS source code as a 
Ruby string.  If that's the case, then you'll need to do the logging of 
that value on the JS side -- Ruby can't evaluate JS for you.


> what exactly is going on here.

You're getting confused about what part of your code is in which 
language.

> 
> Thanks

Best,
--
Marnen Laibow-Koser
http://www.marnen.org
marnen@marnen.org
-- 
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