On ruby on rails and forms

(Andres Montano) #1

Does anybody know if the options for a select in a form are accesible via
@params?

I have an application that succesfully builds the select html statements but
then the user modifies the options via javascript. When the form gets
posted, is there a way to know what options are there, which are selected,
etc from the controller?

I have tried all sorts of strategies like adding the [] to the name of the
select tag, but however I name it, param always returns nil.

Thanks,
    Andres

(Julian Leviston) #2

Hi.

I wonder if there's a rails list...

Can you be more specific?

So you've got your helper code down to create HTML select, that's cool... but what do you mean by "use modifies the options via javascript" - how?

Julian.

···

On 08/08/2005, at 12:01 PM, Andres Montano wrote:

Does anybody know if the options for a select in a form are accesible via
@params?

I have an application that succesfully builds the select html statements but
then the user modifies the options via javascript. When the form gets
posted, is there a way to know what options are there, which are selected,
etc from the controller?

I have tried all sorts of strategies like adding the [] to the name of the
select tag, but however I name it, param always returns nil.

Thanks,
    Andres

(Marcelo) #3

Does anyone knows if there is any Nuke-like package for Rails? I mean something like PhPNuke. I personally think that the script generated by
Rails are fine for a starter point, but some of my friends would like it.

Marcelo Paniagua L.

···

--
Este correo esta libre de virus!

(Andres Montano) #4

Thanks for the quick reply Julian. I will provide more detail here.

I have two tables: roles and permissions with a "has_and_belongs_to_many"
relationship between each other.

In the edit action for role, I initialize role and permissions like this:

    @role = Role.find(@params[:id])
    @permissions = Permission.find (:all, :order => "title")

In the model I have two lists: one with all the available permissions and
another with the permissions that a specific role has and buttons that move
stuff from one list to the other using javascript.

The rhtml code for the lists goes like this:

<select id="available_permissions" name="available_permissions" multiple
size="10">
  <% available_permissions = @permissions - @role.permissions %>
  <%= options_for_select (available_permissions.collect { |p| [p.title,
p.id]}) %>
</select>

<select id="role_permissions" name="role[permissions][]" multiple =
"multiple" size="10">
  <%= options_from_collection_for_select(@role.permissions, "id", "title")
%>
</select>

I have two buttons invoke a javascript method to remove an item from one
list and add it to the other list. It goes like this:

function moveSelected(orig, dest)
{
var selectOrig = document.getElementById(orig);
var selectDest = document.getElementById(dest);
var i = 0;
while (i<selectOrig.length)
{
  option = selectOrig.options[i];
  if (option.selected)
  {
   option.selected = false;
   selectOrig.remove(i);
   if (nn6)
   {
    selectDest.length = selectDest.length+1;
    selectDest.options[selectDest.length-1] = option;
   }
   else selectDest.add(option);
  }
  else i++;
}
}

This part works well with records that I added manually to the
permissions_roles intermediate table. Nevertheless the simple
    if @role.update_attributes(@params[:role]) ...

is not intelligent enough to populate role.permissions and update the tables
in the database. That is fine, as long as I can access the select options
from the controller, but whatever name I put in params doesn't seem to work.
The hash returned by @params[:role] or @params["role"] doesn't include
"permissions" (i.e. @params[:role]["permissions"] is nil). Changing the name
to something else like id = "assocperms" name = "assocperms[]" doesn't help
as @params["assocperms"] also is nil (and so is @params["assocperms[]"],
etc.). Also removing the "[]" from the name didn't do the trick. Is my only
alternative to wrap up the select list in a div, send it via a
form_remote_tag, and parse it manually? The must be a more elegant solution.

If anyone can provide insight on how I can tackle this problem it will be
greatly appreciated!

    Andres

"Julian Leviston" <julian@coretech.net.au> wrote in message
news:EE4E8D2C-7BDA-41E2-86E2-AC2C6042A33A@coretech.net.au...

···

Hi.

I wonder if there's a rails list...

Can you be more specific?

So you've got your helper code down to create HTML select, that's cool...
but what do you mean by "use modifies the options via javascript" - how?

Julian.

On 08/08/2005, at 12:01 PM, Andres Montano wrote:

Does anybody know if the options for a select in a form are accesible
via
@params?

I have an application that succesfully builds the select html statements
but
then the user modifies the options via javascript. When the form gets
posted, is there a way to know what options are there, which are
selected,
etc from the controller?

I have tried all sorts of strategies like adding the [] to the name of
the
select tag, but however I name it, param always returns nil.

Thanks,
    Andres

(Brad Wilson) #5

There is.

rails@lists.rubyonrails.org

···

On 8/7/05, Julian Leviston <julian@coretech.net.au> wrote:

I wonder if there's a rails list...

(Gerardo Santana Gómez Garrido) #6

Does anyone knows if there is any Nuke-like package for Rails? I mean
something like PhPNuke. I personally think that the script generated by
Rails are fine for a starter point, but some of my friends would like it.

Marcelo Paniagua L.

Take a look at this one:
http://typo.leetsoft.com/trac/

--
Este correo esta libre de virus!

:stuck_out_tongue:

···

On 8/10/05, Marcelo Paniagua <paniagua@pcmxl.com.mx> wrote:

--
Gerardo Santana Gómez Garrido
http://www.openbsd.org.mx/santana/
"Entre los individuos, como entre las naciones, el respeto al derecho
ajeno es la paz" -Don Benito Juárez

(Julian Leviston) #7

Isn't what you're trying to do AJAX?

J

···

On 08/08/2005, at 2:01 PM, Andres Montano wrote:

Thanks for the quick reply Julian. I will provide more detail here.

I have two tables: roles and permissions with a "has_and_belongs_to_many"
relationship between each other.

In the edit action for role, I initialize role and permissions like this:

    @role = Role.find(@params[:id])
    @permissions = Permission.find (:all, :order => "title")

In the model I have two lists: one with all the available permissions and
another with the permissions that a specific role has and buttons that move
stuff from one list to the other using javascript.

The rhtml code for the lists goes like this:

<select id="available_permissions" name="available_permissions" multiple
size="10">
  <% available_permissions = @permissions - @role.permissions %>
  <%= options_for_select (available_permissions.collect { |p| [p.title,
p.id]}) %>
</select>

<select id="role_permissions" name="role[permissions][]" multiple =
"multiple" size="10">
  <%= options_from_collection_for_select(@role.permissions, "id", "title")
%>
</select>

I have two buttons invoke a javascript method to remove an item from one
list and add it to the other list. It goes like this:

function moveSelected(orig, dest)
{
var selectOrig = document.getElementById(orig);
var selectDest = document.getElementById(dest);
var i = 0;
while (i<selectOrig.length)
{
  option = selectOrig.options[i];
  if (option.selected)
  {
   option.selected = false;
   selectOrig.remove(i);
   if (nn6)
   {
    selectDest.length = selectDest.length+1;
    selectDest.options[selectDest.length-1] = option;
   }
   else selectDest.add(option);
  }
  else i++;
}
}

This part works well with records that I added manually to the
permissions_roles intermediate table. Nevertheless the simple
    if @role.update_attributes(@params[:role]) ...

is not intelligent enough to populate role.permissions and update the tables
in the database. That is fine, as long as I can access the select options
from the controller, but whatever name I put in params doesn't seem to work.
The hash returned by @params[:role] or @params["role"] doesn't include
"permissions" (i.e. @params[:role]["permissions"] is nil). Changing the name
to something else like id = "assocperms" name = "assocperms[]" doesn't help
as @params["assocperms"] also is nil (and so is @params["assocperms[]"],
etc.). Also removing the "[]" from the name didn't do the trick. Is my only
alternative to wrap up the select list in a div, send it via a
form_remote_tag, and parse it manually? The must be a more elegant solution.

If anyone can provide insight on how I can tackle this problem it will be
greatly appreciated!

    Andres

"Julian Leviston" <julian@coretech.net.au> wrote in message
news:EE4E8D2C-7BDA-41E2-86E2-AC2C6042A33A@coretech.net.au...

Hi.

I wonder if there's a rails list...

Can you be more specific?

So you've got your helper code down to create HTML select, that's cool...
but what do you mean by "use modifies the options via javascript" - how?

Julian.

On 08/08/2005, at 12:01 PM, Andres Montano wrote:

Does anybody know if the options for a select in a form are accesible
via
@params?

I have an application that succesfully builds the select html statements
but
then the user modifies the options via javascript. When the form gets
posted, is there a way to know what options are there, which are
selected,
etc from the controller?

I have tried all sorts of strategies like adding the [] to the name of
the
select tag, but however I name it, param always returns nil.

Thanks,
    Andres

(Devin Mullins) #8

Andres,

To understand what's happening, you're going to have to look at HTML forms, and the queries it builds. (Use GET method instead of POST so you can look at it.) Your error has nothing to do with Rails, except in that it can't read the user's mind. I'm way too tired to explain right now, so start Googling. :slight_smile: The short answer, if you want to stick with the same interface, is you're going to have to use some javascript to build up some hidden fields.

Whether you use AJAX to send the updated results back before the user even hits submit is up to you. But if you want to, the prototype library that comes with Rails should help.

Devin

Andres Montano wrote:

···

Thanks for the quick reply Julian. I will provide more detail here.

I have two tables: roles and permissions with a "has_and_belongs_to_many" relationship between each other.

In the edit action for role, I initialize role and permissions like this:

   @role = Role.find(@params[:id])
   @permissions = Permission.find (:all, :order => "title")

In the model I have two lists: one with all the available permissions and another with the permissions that a specific role has and buttons that move stuff from one list to the other using javascript.

The rhtml code for the lists goes like this:

<select id="available_permissions" name="available_permissions" multiple size="10">
<% available_permissions = @permissions - @role.permissions %>
<%= options_for_select (available_permissions.collect { |p| [p.title, p.id]}) %>
</select>

<select id="role_permissions" name="role[permissions][]" multiple = "multiple" size="10">
<%= options_from_collection_for_select(@role.permissions, "id", "title") %>
</select>

I have two buttons invoke a javascript method to remove an item from one list and add it to the other list. It goes like this:

function moveSelected(orig, dest)
{
var selectOrig = document.getElementById(orig);
var selectDest = document.getElementById(dest);
var i = 0;
while (i<selectOrig.length)
{
option = selectOrig.options[i];
if (option.selected)
{
  option.selected = false;
  selectOrig.remove(i);
  if (nn6)
  {
   selectDest.length = selectDest.length+1;
   selectDest.options[selectDest.length-1] = option;
  }
  else selectDest.add(option);
}
else i++;
}

This part works well with records that I added manually to the permissions_roles intermediate table. Nevertheless the simple
   if @role.update_attributes(@params[:role]) ...

is not intelligent enough to populate role.permissions and update the tables in the database. That is fine, as long as I can access the select options from the controller, but whatever name I put in params doesn't seem to work. The hash returned by @params[:role] or @params["role"] doesn't include "permissions" (i.e. @params[:role]["permissions"] is nil). Changing the name to something else like id = "assocperms" name = "assocperms[]" doesn't help as @params["assocperms"] also is nil (and so is @params["assocperms[]"], etc.). Also removing the "[]" from the name didn't do the trick. Is my only alternative to wrap up the select list in a div, send it via a form_remote_tag, and parse it manually? The must be a more elegant solution.

If anyone can provide insight on how I can tackle this problem it will be greatly appreciated!

   Andres

"Julian Leviston" <julian@coretech.net.au> wrote in message news:EE4E8D2C-7BDA-41E2-86E2-AC2C6042A33A@coretech.net.au...

Hi.

I wonder if there's a rails list...

Can you be more specific?

So you've got your helper code down to create HTML select, that's cool... but what do you mean by "use modifies the options via javascript" - how?

Julian.

On 08/08/2005, at 12:01 PM, Andres Montano wrote:

Does anybody know if the options for a select in a form are accesible via
@params?

I have an application that succesfully builds the select html statements but
then the user modifies the options via javascript. When the form gets
posted, is there a way to know what options are there, which are selected,
etc from the controller?

I have tried all sorts of strategies like adding the [] to the name of the
select tag, but however I name it, param always returns nil.

Thanks,
   Andres

(Andres Montano) #9

Hi Julian et all,

Isn't what you're trying to do AJAX?

That is what I meant with "Is my only alternative to wrap up the select list
in a div, send it via a
form_remote_tag, and parse it manually?"

Nevertheless I have issues with that approach. As I see it the real benefit
of AJAX is to update parts of the page through information sent to and
received from the server without reloading the whole page. But the thing is,
for this particular application, since I am only moving items from one list
to the other I have all the information I need on the client side to update
such parts of the page only with javascript. Put in other words, this
application should only need the JA part of AJAX! :wink:

Sending the information as hidden fields such as Devin Mullins and Jim
Herring are proposing sounds like a smoother solution! This comes with a
very stupid javascript related question. Is there some page that people use
to know (Netscape and IE's) javascript's API? While writing these small
javascript functions I search some for a good site with the precise syntax
but everything seems really incomplete and vague. This page is nice:

http://www.w3schools.com/js/default.asp

but stuff is still missing from there. For instance, where can I find which
constructors does Hidden take?

    Andres

···

On 08/08/2005, at 2:01 PM, Andres Montano wrote:

Thanks for the quick reply Julian. I will provide more detail here.

I have two tables: roles and permissions with a
"has_and_belongs_to_many"
relationship between each other.

In the edit action for role, I initialize role and permissions like
this:

    @role = Role.find(@params[:id])
    @permissions = Permission.find (:all, :order => "title")

In the model I have two lists: one with all the available permissions
and
another with the permissions that a specific role has and buttons that
move
stuff from one list to the other using javascript.

The rhtml code for the lists goes like this:

<select id="available_permissions" name="available_permissions" multiple
size="10">
  <% available_permissions = @permissions - @role.permissions %>
  <%= options_for_select (available_permissions.collect { |p| [p.title,
p.id]}) %>
</select>

<select id="role_permissions" name="role[permissions][]" multiple =
"multiple" size="10">
  <%= options_from_collection_for_select(@role.permissions, "id",
"title")
%>
</select>

I have two buttons invoke a javascript method to remove an item from one
list and add it to the other list. It goes like this:

function moveSelected(orig, dest)
{
var selectOrig = document.getElementById(orig);
var selectDest = document.getElementById(dest);
var i = 0;
while (i<selectOrig.length)
{
  option = selectOrig.options[i];
  if (option.selected)
  {
   option.selected = false;
   selectOrig.remove(i);
   if (nn6)
   {
    selectDest.length = selectDest.length+1;
    selectDest.options[selectDest.length-1] = option;
   }
   else selectDest.add(option);
  }
  else i++;
}
}

This part works well with records that I added manually to the
permissions_roles intermediate table. Nevertheless the simple
    if @role.update_attributes(@params[:role]) ...

is not intelligent enough to populate role.permissions and update the
tables
in the database. That is fine, as long as I can access the select
options
from the controller, but whatever name I put in params doesn't seem to
work.
The hash returned by @params[:role] or @params["role"] doesn't include
"permissions" (i.e. @params[:role]["permissions"] is nil). Changing the
name
to something else like id = "assocperms" name = "assocperms[]" doesn't
help
as @params["assocperms"] also is nil (and so is @params["assocperms []"],
etc.). Also removing the "[]" from the name didn't do the trick. Is my
only
alternative to wrap up the select list in a div, send it via a
form_remote_tag, and parse it manually? The must be a more elegant
solution.

If anyone can provide insight on how I can tackle this problem it will
be
greatly appreciated!

    Andres

"Julian Leviston" <julian@coretech.net.au> wrote in message
news:EE4E8D2C-7BDA-41E2-86E2-AC2C6042A33A@coretech.net.au...

Hi.

I wonder if there's a rails list...

Can you be more specific?

So you've got your helper code down to create HTML select, that's
cool...
but what do you mean by "use modifies the options via javascript" -
how?

Julian.

On 08/08/2005, at 12:01 PM, Andres Montano wrote:

Does anybody know if the options for a select in a form are accesible
via
@params?

I have an application that succesfully builds the select html
statements
but
then the user modifies the options via javascript. When the form gets
posted, is there a way to know what options are there, which are
selected,
etc from the controller?

I have tried all sorts of strategies like adding the [] to the name
of
the
select tag, but however I name it, param always returns nil.

Thanks,
    Andres

(Devin Mullins) #10

Andres Montano wrote:

Is there some page that people use to know (Netscape and IE's) javascript's API? While writing these small javascript functions I search some for a good site with the precise syntax but everything seems really incomplete and vague.

An (extremely) oldie but goodie:
http://wp.netscape.com/eng/mozilla/3.0/handbook/javascript/

For anything since then, I can't help, but http://www.amazon.com/exec/obidos/ASIN/0596000480/ seems to be recommended.

Does Hidden even have a public constructor?

Devin