Rails - Dec 2007 - is it possible to have format.html and format.json output the same results?

My index action currently looks like this

def index
    @pictures = Picture.search(params[:page])
    respond_to do |format|
      format.html
      format.json  { render :text => @pictures.to_json }
    end
end

format.json is used to display the location of pictures on a map.  The
javascript code is simple and looks like this:

function listMarkers() {
	var request = GXmlHttp.create();
	request.open(''GET'', ''pictures.json'', true);
	request.onreadystatechange = function() ...

The problem is that the json output always assumes it''s on the first
page since it has no idea what params[:page] is.  So while the view is
on page 2 the map still shows markers for page 1.  Is there a way to
have format.html and format.json output the same @pictures so that the
markers on the map correspond to what''s in the view?
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vince wrote:
>
> function listMarkers() {
> 	var request = GXmlHttp.create();
> 	request.open(''GET'', ''pictures.json'',
true);
> 	request.onreadystatechange = function() ...
>
> The problem is that the json output always assumes it''s on the
first
> page since it has no idea what params[:page] is.  So while the view is
> on page 2 the map still shows markers for page 1.  Is there a way to
> have format.html and format.json output the same @pictures so that the
> markers on the map correspond to what''s in the view?
Your listMarkers function should be passing the current page through.

Fred
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Fred - can you explain what you mean by passing the current page
through?

On Dec 15, 3:47 pm, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> vince wrote:
>
> > function listMarkers() {
> >    var request = GXmlHttp.create();
> >    request.open(''GET'',
''pictures.json'', true);
> >    request.onreadystatechange = function() ...
>
> > The problem is that the json output always assumes it''s on
the first
> > page since it has no idea what params[:page] is.  So while the view is
> > on page 2 the map still shows markers for page 1.  Is there a way to
> > have format.html and format.json output the same @pictures so that the
> > markers on the map correspond to what''s in the view?
>
> Your listMarkers function should be passing the current page through.
>
> Fred
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On Dec 15, 9:26 pm, vince
<stha...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Fred - can you explain what you mean by passing the current page
> through?
>
Well your listMarkers function is requesting pictures.json. You could
rewrite it as
function listMarkers(page){
var request = GXmlHttp.create();
    request.open(''GET'',
''pictures.json?page=''+page, true);
    request.onreadystatechange = function()
}
And then call it with the appropriate parameter
Fred
> On Dec 15, 3:47 pm, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> wrote:
>
> > vince wrote:
>
> > > function listMarkers() {
> > >    var request = GXmlHttp.create();
> > >    request.open(''GET'',
''pictures.json'', true);
> > >    request.onreadystatechange = function() ...
>
> > > The problem is that the json output always assumes it''s
on the first
> > > page since it has no idea what params[:page] is.  So while the
view is
> > > on page 2 the map still shows markers for page 1.  Is there a way
to
> > > have format.html and format.json output the same @pictures so
that the
> > > markers on the map correspond to what''s in the view?
>
> > Your listMarkers function should be passing the current page through.
>
> > Fred
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hmm.. but listMarkers is inside application.js that looks like this:

window.onload = init;
function init() {
  ....
  listMarkers();
}

i don''t know how to access the page param from application.js.

On Dec 15, 4:33 pm, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> On Dec 15, 9:26 pm, vince
<stha...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> Fred - can
you explain what you mean by passing the current page
> > through?
>
> Well your listMarkers function is requesting pictures.json. You could
> rewrite it as
> function listMarkers(page){
> var request = GXmlHttp.create();
>     request.open(''GET'',
''pictures.json?page=''+page, true);
>     request.onreadystatechange = function()}
>
> And then call it with the appropriate parameter
> Fred
>
> > On Dec 15, 3:47 pm, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> > wrote:
>
> > > vince wrote:
>
> > > > function listMarkers() {
> > > >    var request = GXmlHttp.create();
> > > >    request.open(''GET'',
''pictures.json'', true);
> > > >    request.onreadystatechange = function() ...
>
> > > > The problem is that the json output always assumes
it''s on the first
> > > > page since it has no idea what params[:page] is.  So while
the view is
> > > > on page 2 the map still shows markers for page 1.  Is there
a way to
> > > > have format.html and format.json output the same @pictures
so that the
> > > > markers on the map correspond to what''s in the
view?
>
> > > Your listMarkers function should be passing the current page
through.
>
> > > Fred
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On Dec 16, 1:10 am, vince
<stha...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> hmm.. but listMarkers is inside application.js that looks like this:
>
> window.onload = init;
> function init() {
>   ....
>   listMarkers();
>
> }
>
> i don''t know how to access the page param from application.js.
>
I''m no js expert, but off the top of my head you could either fiddle
with window.location, have a bit of js at the top of your rhtml (or
html.erb is we''re being rails 2.0) that sets a variable to the current
page, or set window.onload from somewhere in your rhtml.

Fred
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well, i don''t know how good or scalable my solution is, but i got it
to work by saving the current page in the session (cookie).  That way
when the controller gets a json request it can return the results for
the current page number.  i feel like this must be a pretty standard
problem with a standard solution being that there are so many sites
out there that display a map alongside search results - any other
suggestions are greatly appreciated.

On Dec 16, 6:22 am, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> On Dec 16, 1:10 am, vince
<stha...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> hmm.. but
listMarkers is inside application.js that looks like this:
>
> > window.onload = init;
> > function init() {
> >   ....
> >   listMarkers();
>
> > }
>
> > i don''t know how to access the page param from
application.js.
>
> I''m no js expert, but off the top of my head you could either
fiddle
> with window.location, have a bit of js at the top of your rhtml (or
> html.erb is we''re being rails 2.0) that sets a variable to the
current
> page, or set window.onload from somewhere in your rhtml.
>
> Fred
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On 17 Dec 2007, at 03:40, vince wrote:
>
> well, i don''t know how good or scalable my solution is, but i got
it
> to work by saving the current page in the session (cookie).  That way
> when the controller gets a json request it can return the results for
> the current page number.  i feel like this must be a pretty standard
> problem with a standard solution being that there are so many sites
> out there that display a map alongside search results - any other
> suggestions are greatly appreciated.
Well it won''t work if the same user is trying has 2 browser windows  
open pointed at your website :-)

Fred
>
>
> On Dec 16, 6:22 am, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> wrote:
>> On Dec 16, 1:10 am, vince
<stha...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> hmm.. but
>> listMarkers is inside application.js that looks like this:
>>
>>> window.onload = init;
>>> function init() {
>>>  ....
>>>  listMarkers();
>>
>>> }
>>
>>> i don''t know how to access the page param from
application.js.
>>
>> I''m no js expert, but off the top of my head you could either
fiddle
>> with window.location, have a bit of js at the top of your rhtml (or
>> html.erb is we''re being rails 2.0) that sets a variable to the
>> current
>> page, or set window.onload from somewhere in your rhtml.
>>
>> Fred
> >

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dang, you''re right - sessions is not going to work.  any other ideas?
i don''t think i can use window.location in my javascript because the
search function uses rjs/ajax to update @pictures using
"page.replace_html ''results'', :partial =>
''results'' + format.js so
using window.location would still not be the same as what''s on the
screen.  how does everyone else do this?? :) i would think showing a
map next to search results on a website is a problem that''s been
solved long ago.

def index
    @pictures = Picture.search(params[:page], params[:tags])
    respond_to do |format|
      format.html
      format.js
      format.json  { render :text => @pictures.to_json }
    end
end

On Dec 16, 11:05 pm, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> On 17 Dec 2007, at 03:40, vince wrote:
>
>
>
> > well, i don''t know how good or scalable my solution is, but i
got it
> > to work by saving the current page in the session (cookie).  That way
> > when the controller gets a json request it can return the results for
> > the current page number.  i feel like this must be a pretty standard
> > problem with a standard solution being that there are so many sites
> > out there that display a map alongside search results - any other
> > suggestions are greatly appreciated.
>
> Well it won''t work if the same user is trying has 2 browser
windows
> open pointed at your website :-)
>
> Fred
>
>
>
> > On Dec 16, 6:22 am, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> > wrote:
> >> On Dec 16, 1:10 am, vince
<stha...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> hmm.. but
> >> listMarkers is inside application.js that looks like this:
>
> >>> window.onload = init;
> >>> function init() {
> >>>  ....
> >>>  listMarkers();
>
> >>> }
>
> >>> i don''t know how to access the page param from
application.js.
>
> >> I''m no js expert, but off the top of my head you could
either fiddle
> >> with window.location, have a bit of js at the top of your rhtml
(or
> >> html.erb is we''re being rails 2.0) that sets a variable
to the
> >> current
> >> page, or set window.onload from somewhere in your rhtml.
>
> >> Freda
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On 17 Dec 2007, at 19:25, vince wrote:
>
> dang, you''re right - sessions is not going to work.  any other
ideas?
> i don''t think i can use window.location in my javascript because
the
> search function uses rjs/ajax to update @pictures using
> "page.replace_html ''results'', :partial =>
''results'' + format.js so
> using window.location would still not be the same as what''s on the
You could have a javascript variable on the page. the ajax you use to  
update the page can also update that variable.

Fred
> screen.  how does everyone else do this?? :) i would think showing a
> map next to search results on a website is a problem that''s been
> solved long ago.
>
> def index
>    @pictures = Picture.search(params[:page], params[:tags])
>    respond_to do |format|
>      format.html
>      format.js
>      format.json  { render :text => @pictures.to_json }
>    end
> end
>
> On Dec 16, 11:05 pm, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> wrote:
>> On 17 Dec 2007, at 03:40, vince wrote:
>>
>>
>>
>>> well, i don''t know how good or scalable my solution is,
but i got it
>>> to work by saving the current page in the session (cookie).  That  
>>> way
>>> when the controller gets a json request it can return the results  
>>> for
>>> the current page number.  i feel like this must be a pretty
standard
>>> problem with a standard solution being that there are so many sites
>>> out there that display a map alongside search results - any other
>>> suggestions are greatly appreciated.
>>
>> Well it won''t work if the same user is trying has 2 browser
windows
>> open pointed at your website :-)
>>
>> Fred
>>
>>
>>
>>> On Dec 16, 6:22 am, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
>>> wrote:
>>>> On Dec 16, 1:10 am, vince
<stha...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> hmm.. but
>>>> listMarkers is inside application.js that looks like this:
>>
>>>>> window.onload = init;
>>>>> function init() {
>>>>> ....
>>>>> listMarkers();
>>
>>>>> }
>>
>>>>> i don''t know how to access the page param from
application.js.
>>
>>>> I''m no js expert, but off the top of my head you could
either
>>>> fiddle
>>>> with window.location, have a bit of js at the top of your rhtml
(or
>>>> html.erb is we''re being rails 2.0) that sets a
variable to the
>>>> current
>>>> page, or set window.onload from somewhere in your rhtml.
>>
>>>> Freda
> >

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