Rails - Feb 2006 - convert rails object to javascript variables

Am i a total idiot to try and parse out a rails object for javascript
in this way?

	
<%
	for i in interface_items[0].attributes
%>
var <%= i[0] %> = "<%=h( i[1] )%>"
<%	
	end
%>	

Am I missing something really obvious?

Thanks,
Mark

--
--------------------------------------------------------------------
I am Mark Daggett and I approve this message.

A nicer way to do this would be to turn your object into JSON with ruby-json:

gem install ruby-json

JSON is actually valid javascript so you can then do something like this:
<%
require_gem ''ruby-json''
%>

var data = <%= interface_items.to_json %>;

then the javascript varaible data would contain a representation of
the object which looks like it would be an array in this case.

Cheers,

Dan

On 2/10/06, M Daggett <heavysixer@gmail.com>
wrote:
> Am i a total idiot to try and parse out a rails object for javascript
> in this way?
>
>
> <%
>         for i in interface_items[0].attributes
> %>
> var <%= i[0] %> = "<%=h( i[1] )%>"
> <%
>         end
> %>
>
> Am I missing something really obvious?
>
> Thanks,
> Mark
>
> --
> --------------------------------------------------------------------
> I am Mark Daggett and I approve this message.
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>

--
Dan Webb
http://www.danwebb.net

On Thu, Feb 09, 2006 at 10:16:32PM -0800, M Daggett wrote:
} Am i a total idiot to try and parse out a rails object for javascript
} in this way?
} 	
} <%
} 	for i in interface_items[0].attributes
} %>
} var <%= i[0] %> = "<%=h( i[1] )%>"
} <%	
} 	end
} %>	

That should probably work, but you are also probably better off with JSON
<http://www.json.org/>:

module IncludeThisInYourHelper
  def obj_to_simple_JSON(obj)
    q = ''"''
    json = ''{ ''
    for i in obj.attributes
      #escape single quotes; a </script> tag would also be bad
      value = i[1].to_s.gsub(/''/,
"''+#{q}''#{q}+''")
      json << "''#{i[0]} : ''#{value}''"
    end
    return json.sub(/, $/, '' }'')
  end
end

...and in your .rhtml...

var myobject = <%= obj_to_simple_JSON %>;

} Am I missing something really obvious?

Just that it''s better to put such things in helpers, usually.

} Thanks,
} Mark
--Greg

On Fri, Feb 10, 2006 at 01:41:44PM +0000, Dan Webb wrote:
} A nicer way to do this would be to turn your object into JSON with ruby-json:
} 
} gem install ruby-json
} 
} JSON is actually valid javascript so you can then do something like this:
} <%
} require_gem ''ruby-json''
} %>
} 
} var data = <%= interface_items.to_json %>;
} 
} then the javascript varaible data would contain a representation of
} the object which looks like it would be an array in this case.

Oh, COOL! I thought I was being spiffy with my quickie JSON output, but
that''s much better. Thanks for bringing it to my (our) attention.

} Cheers,
} Dan
--Greg

It works straight out of the box on hashes and arrays but if you want
to serialize a whole object you need to make your own to_json method
but its not difficult.

On 2/10/06, Gregory Seidman <gsslist+ror@anthropohedron.net>
wrote:
> On Fri, Feb 10, 2006 at 01:41:44PM +0000, Dan Webb wrote:
> } A nicer way to do this would be to turn your object into JSON with
ruby-json:
> }
> } gem install ruby-json
> }
> } JSON is actually valid javascript so you can then do something like this:
> } <%
> } require_gem ''ruby-json''
> } %>
> }
> } var data = <%= interface_items.to_json %>;
> }
> } then the javascript varaible data would contain a representation of
> } the object which looks like it would be an array in this case.
>
> Oh, COOL! I thought I was being spiffy with my quickie JSON output, but
> that''s much better. Thanks for bringing it to my (our) attention.
>
> } Cheers,
> } Dan
> --Greg
>
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>

--
Dan Webb
http://www.danwebb.net

Hey Dan and Gregory,
That was a great help. I was able to get access to my variables 20
seconds after I installed the GEM. Thanks so much for pointing me in
the right direction.

Mark

On 2/10/06, Dan Webb <dan@danwebb.net> wrote:
> It works straight out of the box on hashes and arrays but if you want
> to serialize a whole object you need to make your own to_json method
> but its not difficult.
>
> On 2/10/06, Gregory Seidman <gsslist+ror@anthropohedron.net> wrote:
> > On Fri, Feb 10, 2006 at 01:41:44PM +0000, Dan Webb wrote:
> > } A nicer way to do this would be to turn your object into JSON with
ruby-json:
> > }
> > } gem install ruby-json
> > }
> > } JSON is actually valid javascript so you can then do something like
this:
> > } <%
> > } require_gem ''ruby-json''
> > } %>
> > }
> > } var data = <%= interface_items.to_json %>;
> > }
> > } then the javascript varaible data would contain a representation of
> > } the object which looks like it would be an array in this case.
> >
> > Oh, COOL! I thought I was being spiffy with my quickie JSON output,
but
> > that''s much better. Thanks for bringing it to my (our)
attention.
> >
> > } Cheers,
> > } Dan
> > --Greg
> >
> > _______________________________________________
> > Rails mailing list
> > Rails@lists.rubyonrails.org
> > http://lists.rubyonrails.org/mailman/listinfo/rails
> >
>
>
> --
> Dan Webb
> http://www.danwebb.net
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>

--
--------------------------------------------------------------------
I am Mark Daggett and I approve this message.

Dan Webb wrote:
> It works straight out of the box on hashes and arrays but if you want
> to serialize a whole object you need to make your own to_json method
> but its not difficult.
There''s this AR->JSON function:
http://www.bigbold.com/snippets/posts/show/474

-- 
We develop, watch us RoR, in numbers too big to ignore.

On 2/10/06, Mark Reginald James <mrj@bigpond.net.au>
wrote:
> Dan Webb wrote:
> > It works straight out of the box on hashes and arrays but if you want
> > to serialize a whole object you need to make your own to_json method
> > but its not difficult.
>
> There''s this AR->JSON function:
http://www.bigbold.com/snippets/posts/show/474
Extremely useful, as is the rest of this thread.  I''ve been looking
all day - enough time to write a few JSON generators - for the easiest
way of turning some AR objects or simple hashes into simple JavaScript
(JSON).

Cheers to everyone who has carried solution into this thread,

  - Rowan Rodrik

--
Morality is usually taught by the immoral.