Check_box with problem

Rails
1

hello list!!!

I have this in my proyect

in my controller
def elegir
@mercado=Mercado.find(:all)
@empresas=Empresa.find(:first)
respond_to do |format|
format.html {render :layout => false}
end
end

elegir view is

Mercados:

<%i=1%> <% @mercado.each do |mercado| %>

<%= check_box_tag "empresa[mercado_ids][]", mercado.id, @empresas.mercados.include?(mercado), {:onclick => remote_function(:url =>{:action => "mostrar2", :id_valor =>i}, :with => "'id=#{mercado.id}'")} %> <%= mercado.nombre %>
<%i=i+1%> <% end %>

I pass diferent muestra_i for check_box
and mostrar2 is…

def mostrar2
@empresa = []
@mercado= Mercado.find(params[:id])
@empresa << @mercado.empresas
render :update do |page|
page.replace_html ‘muestra_’ + params[:id_valor], :partial =>
‘muestra2’, :object => @empresa
end
end

but when I click on the check_box, this is the messages

TypeError: element is null

Element.update(“muestra_2”, “\n\n\u003Cbr /\u003E\n\u003Cp\u003ELas
empresas de este mercado son \n\n \u003Cp\u003E\u003Cb\u003ENombre:
\u003C/b\u003E acciona \u003C/p\u003E\n\u003C/p\u003E\n\n
\u003Cp\u003E\u003Cb\u003ENombre: \u003C/b\u003E gtf
\u003C/p\u003E\n\u003C/p\u003E\n\n\n”);

and my file development.log write this

Completed in 0.29700 (3 reqs/sec) | Rendering: 0.04700 (15%) | DB:
0.09500 (31%) | 200 OK [http://localhost/mercados/mostrar2?id_valor=2]

any idea???

thanks

2

On Aug 22, 2:42 pm, Maite P. [email protected]
wrote:

Mercados:

<%i=1%> <% @mercado.each do |mercado| %>

<%= check_box_tag "empresa[mercado_ids][]", mercado.id, @empresas.mercados.include?(mercado), {:onclick => remote_function(:url =>{:action => "mostrar2", :id_valor =>i}, :with => "'id=#{mercado.id}'")} %> <%= mercado.nombre %>

The error message is telling you that you don’t have an element with
id muestra_2. Have you checked the html you generate?
I bet you’ll find that all your divs are

(and not

,
, ..._

Fred

3

deberia ser

On Aug 22, 2:45 pm, Frederick C. [email protected]

4

Another thing. instead of

i = 0
@collection.each do |obj|
obj += i

end

you can do:

@collecation.each_with_index |obj, i|
…
end

same thing, more readable.

On Aug 22, 2:45 pm, Frederick C. [email protected]

5

On 22 Aug 2008, at 15:08, Wolas! wrote:

@collecation.each_with_index |obj, i|
…
end

Or use a partial.

Fred

6

Defenitely use a partial if you can. they save readability,
manageability and are just very cool ingeneral.

from docs:

Renders the same partial with a local variable.

render :partial => “person”, :locals => { :name => “david” }

Renders the partial, making @new_person available through

the local variable ‘person’

render :partial => “person”, :object => @new_person

Renders a collection of the same partial by making each element

of @winners available through the local variable “person” as it

builds the complete response.

render :partial => “person”, :collection => @winners

Renders the same collection of partials, but also renders the

person_divider partial between each person partial.

render :partial => “person”, :collection =>
@winners, :spacer_template => “person_divider”

Renders a collection of partials located in a view subfolder

outside of our current controller. In this example we will be

rendering app/views/shared/_note.r(html|xml) Inside the partial

each element of @new_notes is available as the local var “note”.

render :partial => “shared/note”, :collection => @new_notes

Renders the partial with a status code of 500 (internal error).

render :partial => “broken”, :status => 500

On Aug 22, 3:11 pm, Frederick C. [email protected]

7

thanks for all, now it is ok
but I don´t undestand the last

Defenitely use a partial if you can. they save readability,
manageability and are just very cool ingeneral.

use partial where I have my check_box, in elegir.html.erb???

I use partial in mostrar2

render :update do |page|
    page.replace_html 'muestra_' + params[:id_valor], :partial =>

‘muestra2’, :object => @empresa

thanks again

8

On 22 Aug 2008, at 19:01, Maite P. wrote:

thanks for all, now it is ok
but I don´t undestand the last

Defenitely use a partial if you can. they save readability,
manageability and are just very cool ingeneral.

use partial where I have my check_box, in elegir.html.erb???

No. the suggestion was replace

<%i=1%>
<% @mercado.each do |mercado| %>

<%= check_box_tag "empresa[mercado_ids][]", mercado.id, @empresas.mercados.include?(mercado), {:onclick => remote_function(:url =>{:action => "mostrar2", :id_valor =>i}, :with => "'id=#{mercado.id}'")} %> <%= mercado.nombre %>
<%i=i+1%> <% end %>

with

render :partial => ‘mercado’, :collection => @mercado

Inside the mercado partial there will be a mercado_counter variable so
you don’t need to mess around with that i variable

Fred

9

Adding to Fred’s suggestion, you would want to do this:

controller:
@mercados = Mercado.find :all

view:
render :partial => @mercados

partial:
<% div_for mercado %>
<%= check_box_tag “empresa[mercado_ids][]”, mercado.id,
@empresas.mercados.include?(mercado), {:onclick =>
remote_function(:url =>{:action => “mostrar2”, :id_valor=>i}, :with =>
“‘id=#{mercado.id}’”)} %>
<%= mercado.nombre %>
<% end %>

There are ways to clean this up more (for example, pass @empresas
through :local in the render partial declaration) and I believe some
of the functions I’ve used will only work this way under Rails 2+.
div_for will automatically create div id’s like ‘mercado_3’, etc.

Hope this helps!

On Aug 22, 1:02 pm, Frederick C. [email protected]