Help with meta programming

Ruby
1

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”. 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
what exactly is going on here.

Thanks

2

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
[email protected]