[Ruby] evaluating Javascript within <%= %> within a template file

[Frank Schwieterman]

  Hmm alright.  It turns out that when I use '<%= url_for :action =>
"thing", :id => "' + id_to_use + '"%>', the '+' and the quotes are escaped
in the resulting HTML/Javascript.  So it doesn't work...

  I guess my options are to either hardcode the url, or put in a string I
can replace later with a regex.  It seems the later is safer in case the
url_for behavior changes... I doubt that would happen though.

thx everyone for the help


On 8/7/07, Laurel Fan <laurel.fan at gmail.com> wrote:
>
> On 8/7/07, Frank Schwieterman <fschwiet at gmail.com> wrote:
> >   One issue I see is that the <% %> enclosure is evaluated when the
> website
> > is served, but "id_to_use" will not have a value until the Javascript is
> > ran.  I don't see any way for a <% %> enclosure to take a
> parameter.  Maybe
> > this is just not possible...
>
> Right, it's not possible for the ruby code to "take a parameter" from
> Javascript.  I think the general idea that Jack is going for is that
> you want ruby code that outputs Javascript that takes a parameter.
> For example, this might be the Javascript that you want to end up
> with:
>
> var url = 'http://test.host/thing/edit/' + id_to_use + ''
>
> In which case you might want what Jack suggested, something like:
>
> var url = '<%= url_for :action => "thing", :id => "' + id_to_use + '"%>'
>
> Assuming you don't drown in nested single quotes and double quotes,
> what this does is trick url_for into putting the string ' + id_to_use
> + ' in place of where you'd normally have the integer id.  So instead
> of generating a url it generates something you can make into
> Javascript code.
>
> For this particular case it's pretty messy, since you can't really
> duplicate all of the routing magic behind url_for in js (what happens
> if you make pretty urls with the object name in them, etc).
>
> If you want to do a lot of this sort of stuff, Rails has a lot of
> javascript helper stuff like Prototype, RJS templates, scriptaculous
> (and probably a lot more stuff that I don't keep up with because I
> don't do a lot of this sort of stuff).
>
> --
> Laurel Fan
> http://blog.gorgorg.org
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