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Veena Jose

2010-Mar-03 05:18 UTC

how to obtain the index of selected item from select box?

Hai friends,

    I am a newbie in ROR.I hav created a select box which takes value
from the databaseI dont know how to get the id or index of the value
selected.

Controller:

class ReadingsController < ApplicationController
def index
@locations= Station.find(:all,:group => "state",:order
=>"state")
end
end

View:

<% form_for :station ,:url => {:action => ''index'',:id
=> @station } do
|form| %>
<center><b> <%= form.label :Stations  %></b>
<%= form.collection_select("state", @locations, :id, :state)  %>
</center>
<%end%>

I want to display the readings according to the selected state
for eg: If I select "Karnataka" from the select box i should get all
the
rows in that table whose state="Karnataka"

My table schema is as below
create_table "stations", :force => true do |t|
    t.string   "name"
    t.string   "unit_id"
    t.integer  "sim_no"
    t.string   "state"
    t.string   "district"
    t.string   "province"
    t.integer  "zipcode"
    t.string   "latitude"
    t.string   "longitude"
end

Please give me a reply?
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Nitin Rajora

2010-Mar-03 08:12 UTC

head link

Re: how to obtain the index of selected item from select box?

I wish to answer your query, but I need to know what you are performing on
Readings controller''s index page ?
I think you are having a list of all locations irrespective of state
selected pre-displayed on index page.
And on selection of a particular state from Stations collection_select you
want to recalculate and display list of locations related to only SELECTED
STATE.. maybe after a page refresh or AJAX operation.

Correct me if I am wrong, then you''ll have the solution.

NRJ



On Wed, Mar 3, 2010 at 10:48 AM, Veena Jose
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:
> Hai friends,
>
>    I am a newbie in ROR.I hav created a select box which takes value
> from the databaseI dont know how to get the id or index of the value
> selected.
>
> Controller:
>
> class ReadingsController < ApplicationController
> def index
> @locations= Station.find(:all,:group => "state",:order
=>"state")
> end
> end
>
> View:
>
> <% form_for :station ,:url => {:action =>
''index'',:id => @station } do
> |form| %>
> <center><b> <%= form.label :Stations  %></b>
> <%= form.collection_select("state", @locations, :id, :state) 
%>
> </center>
> <%end%>
>
> I want to display the readings according to the selected state
> for eg: If I select "Karnataka" from the select box i should get
all the
> rows in that table whose state="Karnataka"
>
> My table schema is as below
> create_table "stations", :force => true do |t|
>    t.string   "name"
>    t.string   "unit_id"
>    t.integer  "sim_no"
>    t.string   "state"
>    t.string   "district"
>    t.string   "province"
>    t.integer  "zipcode"
>    t.string   "latitude"
>    t.string   "longitude"
> end
>
> Please give me a reply?
> --
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>
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kannav rajeev

2010-Mar-03 09:27 UTC

head link

Re: how to obtain the index of selected item from select box?

use j query or java scripting to do so or you may saw on  event change on
tutorial OK



On Wed, Mar 3, 2010 at 10:48 AM, Veena Jose
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:
> Hai friends,
>
>    I am a newbie in ROR.I hav created a select box which takes value
> from the databaseI dont know how to get the id or index of the value
> selected.
>
> Controller:
>
> class ReadingsController < ApplicationController
> def index
> @locations= Station.find(:all,:group => "state",:order
=>"state")
> end
> end
>
> View:
>
> <% form_for :station ,:url => {:action =>
''index'',:id => @station } do
> |form| %>
> <center><b> <%= form.label :Stations  %></b>
> <%= form.collection_select("state", @locations, :id, :state) 
%>
> </center>
> <%end%>
>
> I want to display the readings according to the selected state
> for eg: If I select "Karnataka" from the select box i should get
all the
> rows in that table whose state="Karnataka"
>
> My table schema is as below
> create_table "stations", :force => true do |t|
>    t.string   "name"
>    t.string   "unit_id"
>    t.integer  "sim_no"
>    t.string   "state"
>    t.string   "district"
>    t.string   "province"
>    t.integer  "zipcode"
>    t.string   "latitude"
>    t.string   "longitude"
> end
>
> Please give me a reply?
> --
> Posted via http://www.ruby-forum.com/.
>
> --
> You received this message because you are subscribed to the Google Groups
> "Ruby on Rails: Talk" group.
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>

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Rajeev sharma

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Veena Jose

2010-Mar-03 10:50 UTC

head link

Re: how to obtain the index of selected item from select box?

Hai nitin,

What you think is correct.Now i am getting alllocations irrespective of 
state selected pre-displayed on index page.

I want to display only those "districts" which are part of SELECTED 
state in collection_select after AJAX operation
Please help me...

Thanks in advance

Veena

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Nitin Rajora

2010-Mar-03 12:54 UTC

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Re: Re: how to obtain the index of selected item from select box?

Good to know,

Because AJAX is involved and you''re new in rails, I am assuming you
want to
have it work using Prototype library and RJS.

Some pages to let you understand Prototype and JQuery AJAX frameworks in
rails...
http://www.slideshare.net/remy.sharp/prototype-jquery-going-from-one-to-the-other
http://www.prototypejs.org/
http://wiki.github.com/madrobby/scriptaculous/

1. Now, things you will need to make AJAX work.
If you happen to have a layout file for your application, it should load the
javascripts necessary to support AJAX operations.
<%=   javascript_include_tag :defaults  %> will do it for you. It will
include prototype and effects, etc. javascript files.

2. But if you do not have any layout file like application.rhtml or
application.html.erb then you may also choose to put
"javascript_include_tag
:defaults" line directly on index.html.erb or index.rhtml file under your
app/views/readings/index.html.erb or ...index.rhtml.

3. Now we are talking about ReadingsController index action with a list of
all locations displayed on it in a div with id say - <  div
id="reading_list_div"     >
You need one more action which will be take one argument as selected state
and will populate a new list of locations which are related to THAT
PARTICULAR state and render the new list of locations via AJAX on the same
index page.

4.   <%= f.collection_select :state,Station.find(:all,:group =>
"state",:order =>"state"), :id, :name,  {:include_blank
=>"None", :onclick
=> remote_function(:url =>"/reading/show_readings_for_state",
:with =>
"''state_id=''+this.value+''") } %>

This collection select will trigger an AJAX call to your ReadingsController
class for a action named - "show_readings_for_state" which you should
define
in the controller as,

def show_readings_for_state
   @readings = Reading.find_all_by_state_id(params[:state_id])
   respond_to do |format|
      format.js  # this will not redirect the page but will look for
javascript template named ("show_readings_for_state.rjs" inside the
folder
"/app/views/readings/") to execute once     #@readings variable is
initialized.
end #End of respond_to do block
end #End of action show_readings_for_state

5. Now you will need a partial file to replace old list of readings

say _readings_list.html.erb inside
"app/views/readings/_readings_list.html.erb"

6. And finally the rjs template which will be automatically called after
variables in show_readings_for_state action are initialized..
File could be - "show_readings_for_state.rjs" inside the folder
"/app/views/readings/"

page.replace_html :reading_list_div,
:partial=>''readings_list'' ,
:object=>@readings
page.visual_effect :highlight, ''reading_list_div''

Maybe this will help you.

Nitin.
On Wed, Mar 3, 2010 at 4:20 PM, Veena Jose
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:
>
> Hai nitin,
>
> What you think is correct.Now i am getting alllocations irrespective of
> state selected pre-displayed on index page.
>
> I want to display only those "districts" which are part of
SELECTED
> state in collection_select after AJAX operation
> Please help me...
>
> Thanks in advance
>
> Veena
>
> --
> Posted via http://www.ruby-forum.com/.
>
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>
>
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Veena Jose

2010-Mar-04 05:59 UTC

head link

Re: Re: how to obtain the index of selected item from select box?

Thank u Nithin for your detailed explanation...
But i am still not able to do the ajax functionality...

I hav added <%= javascript_include_tag :defaults %> in my
"admin" layout

Controller :

class ReadingsController < ApplicationController
  layout "admin"

  def index
    @time=Time.now
    @locations= Station.find(:all,:group => "state",:order
=>"state")
    @district=Station.find(:all)
    @readings= CurrentReading.find(:all)
    @range=ConfigureParameter.find(:all)
  end

  def show_readings_for_state
    @district = Station.find_all_by_state_id(params[:state_id])
    respond_to do |format|
      format.js
   end
  end
end

readings/index.html.erb

<% form_for :station ,:url => {:action => ''index'',:id
=> @station } do
|f| %>
   <center><b> <%= f.label :Stations  %></b>

<%= f.collection_select(:state, @locations, :id, :state,{},{:onclick 
=>remote_function(:url
=>"/readings/show_readings_for_state",:with
=>"''state_id=''+this.value+''")} )  %>

</center>
<br/><br/>
  <table cellpadding="5">
    <tr>
        <th>Stations</th>
        <th>Time Stamp</th>
        <% for sensor_type in @range %>
            <th><%= sensor_type.Parameters %></th>
        <% end %>
    </tr>
<div id="reading_list_div">
     <% for loc in @district %>
       <tr>
          <td>
              <%=f.radio_button :contact_preference, "0", :tabindex
=>loc.id %> <%=h loc.district %>
          </td>
       </tr>
     <%end%>
</div>
 </table> <br/>
<%end%>

show_readings_for_state.rjs

page.replace_html :reading_list_div,
:partial=>''readings_list'' ,
:object=>@district
page.visual_effect :highlight, ''reading_list_div''

_readings_list.html.erb

 <% for loc in @district %>
    <%= radio_button :contact_preference, "0", :tabindex
=>loc.id %>
<%=h loc.district %>

     <%end%>


This is the code.please look at it and help me.

Thank you,
Veena
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Amar Daxini

2010-Mar-04 06:44 UTC

head link

Re: Re: how to obtain the index of selected item from select box?

Veena Jose wrote:> Thank u Nithin for your detailed explanation...
> But i am still not able to do the ajax functionality...
> 
> I hav added <%= javascript_include_tag :defaults %> in my
"admin" layout
> 
> Controller :
> 
> class ReadingsController < ApplicationController
>   layout "admin"
> 
>   def index
>     @time=Time.now
>     @locations= Station.find(:all,:group => "state",:order
=>"state")
>     @district=Station.find(:all)
>     @readings= CurrentReading.find(:all)
>     @range=ConfigureParameter.find(:all)
>   end
> 
> end
> Hi,
If you are using jquery,you can see e.g
which is  similar
http://github.com/amardaxini/Ajax-Demo

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Veena Jose

2010-Mar-08 07:13 UTC

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Re: Re: how to obtain the index of selected item from select box?

> 3. Now we are talking about ReadingsController index action with a list 
> of
> all locations displayed on it in a div with id say - <  div
> id="reading_list_div"     >
> You need one more action which will be take one argument as selected 
> state
> and will populate a new list of locations which are related to THAT
> PARTICULAR state and render the new list of locations via AJAX on the 
> same
> index page.


How can we do this in the controller?I followed all your steps..but in 
vain...
Plz reply me

Thanks ,
Veena
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Nitin Rajora

2010-Mar-08 07:57 UTC

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Re: Re: Re: how to obtain the index of selected item from select box?

Do one thing, give me migrations or the sql dump of your database structure,
and your app''s directory zip, I will try to replicate the issues
you''re
having and then can assist you further. Because "not able to do the ajax
functionality" is a very big scope of a problem, there can be many reasons.



On Mon, Mar 8, 2010 at 12:43 PM, Veena Jose
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:
>
> > 3. Now we are talking about ReadingsController index action with a
list
> > of
> > all locations displayed on it in a div with id say - <  div
> > id="reading_list_div"     >
> > You need one more action which will be take one argument as selected
> > state
> > and will populate a new list of locations which are related to THAT
> > PARTICULAR state and render the new list of locations via AJAX on the
> > same
> > index page.
>
>
>
> How can we do this in the controller?I followed all your steps..but in
> vain...
> Plz reply me
>
> Thanks ,
> Veena
> --
> Posted via http://www.ruby-forum.com/.
>
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Veena Jose

2010-Mar-08 08:33 UTC

head link

Re: Re: Re: how to obtain the index of selected item from select box?

Hai Nitin,

    I am sending you the app and migrations folder.Please have a look.I 
know that i am asking too many questions..Sorry 4 troubling you...

Thank you very much....

Veena

Attachments:
http://www.ruby-forum.com/attachment/4544/app_n_migrations.rar

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Nitin Rajora

2010-Mar-08 09:22 UTC

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Re: Re: Re: how to obtain the index of selected item from select box?

Your routes file is missing. And on which page do you need the functionality
working.. ?
(without css it is looking all black and white)
Nitin..

On Mon, Mar 8, 2010 at 12:43 PM, Veena Jose
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:
>
> > 3. Now we are talking about ReadingsController index action with a
list
> > of
> > all locations displayed on it in a div with id say - <  div
> > id="reading_list_div"     >
> > You need one more action which will be take one argument as selected
> > state
> > and will populate a new list of locations which are related to THAT
> > PARTICULAR state and render the new list of locations via AJAX on the
> > same
> > index page.
>
>
>
> How can we do this in the controller?I followed all your steps..but in
> vain...
> Plz reply me
>
> Thanks ,
> Veena
> --
> Posted via http://www.ruby-forum.com/.
>
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>
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Veena Jose

2010-Mar-08 09:29 UTC

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Re: Re: Re: how to obtain the index of selected item from select box?

Nitin Rajora wrote:> Your routes file is missing. And on which page do you need the 
> functionality
> working.. ?
> (without css it is looking all black and white)
> Nitin..
Hai Nitin,

   I have attached the css and the config directory

Thanks,
 Veena



Attachments:
http://www.ruby-forum.com/attachment/4545/new.rar

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Veena Jose

2010-Mar-08 09:30 UTC

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Re: Re: Re: how to obtain the index of selected item from select box?

Veena Jose wrote:> Nitin Rajora wrote:
>> Your routes file is missing. And on which page do you need the 
>> functionality
>> working.. ?
>> (without css it is looking all black and white)
>> Nitin..
>  I want the things to be working on the readings/index
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Nitin Rajora

2010-Mar-08 13:21 UTC

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Re: Re: Re: Re: how to obtain the index of selected item from select box?

Hi Veena,

I wasn''t sure what was the Data you wanted to display on your Readings
index
page, but I have assumed following situation.........

1. Readings table initially is showing all current_readings for all stations
on index page
2. There is a stations dropdown filled with all the stations inside
"stations" table.
3. When user selects a particular station from the dropdown, the table
showing Readings.. should be updated for current_readings specific to
selected station...

I have added some entries to current_readings table.

Have a look, And AJAX is supposed to work on Readings/index page.
I have also added a route in your routes file.

Hope you can change this working AJAX structure according to your
requirements

I am attaching two files -
1. Zip of the dummy app I created to make AJAX work.
2. sql for the database I used.
Nitin

On Mon, Mar 8, 2010 at 3:00 PM, Veena Jose
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:
> Veena Jose wrote:
> > Nitin Rajora wrote:
> >> Your routes file is missing. And on which page do you need the
> >> functionality
> >> working.. ?
> >> (without css it is looking all black and white)
> >> Nitin..
> >
>  I want the things to be working on the readings/index
> --
> Posted via http://www.ruby-forum.com/.
>
> --
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> .
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Veena Jose

2010-Mar-09 04:43 UTC

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Re: Re: Re: Re: how to obtain the index of selected item from select box?

Thanku Thanku Thanku soooooooo much........You have really helped me a 
lot.....
The thing you assumed is right for some extend.

1. Readings table initially is showing all current_readings for all
stations
on index page

2. There is a stations dropdown filled with all the states in the 
"stations" table.(eg.,Karnataka,Mumbai etc)

3.When user selects a particular state from the dropdown, the table
showing Readings.. should be updated for current_readings specific to
selected state...(eg. If i select "karnataka" and i hav 2 stations in 
Karnataka it should update the readings of those two stations for 
current_readings)

Your explanations are very easy to understand...Thank you sooooooooo 
much.

Thanks,
Veena

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Nitin Rajora

2010-Mar-09 04:53 UTC

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Re: Re: Re: Re: Re: how to obtain the index of selected item from select box?

Sincerely, glad you made it work.
Nitin.

On Tue, Mar 9, 2010 at 10:13 AM, Veena Jose
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:
>
> Thanku Thanku Thanku soooooooo much........You have really helped me a
> lot.....
> The thing you assumed is right for some extend.
>
> 1. Readings table initially is showing all current_readings for all
> stations
> on index page
>
> 2. There is a stations dropdown filled with all the states in the
> "stations" table.(eg.,Karnataka,Mumbai etc)
>
> 3.When user selects a particular state from the dropdown, the table
> showing Readings.. should be updated for current_readings specific to
> selected state...(eg. If i select "karnataka" and i hav 2
stations in
> Karnataka it should update the readings of those two stations for
> current_readings)
>
> Your explanations are very easy to understand...Thank you sooooooooo
> much.
>
> Thanks,
> Veena
>
> --
> Posted via http://www.ruby-forum.com/.
>
> --
> You received this message because you are subscribed to the Google Groups
> "Ruby on Rails: Talk" group.
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> .
> For more options, visit this group at
> http://groups.google.com/group/rubyonrails-talk?hl=en.
>
>
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Veena Jose

2010-Mar-09 08:52 UTC

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Re: Re: Re: Re: Re: how to obtain the index of selected item from select box?

Hai Nitin,

    I am again disturbing you.....Your code is working fine for me.But i 
want something like this.

1. Readings table initially is showing all current_readings for all
stations
on index page

2. There is a stations dropdown filled with all the states in the
"stations" table.(eg.,Karnataka,Mumbai etc)

3.When user selects a particular state from the dropdown, the table
showing Readings.. should be updated for current_readings specific to
selected state...(eg. If i select "karnataka" and i hav 2 stations in
Karnataka it should update the readings of those two stations for
current_readings)

When i got your code i thought i can make the change very easily.I 
wasted this whole morning in doing this.I don''t know where i am going 
wrong.

Can you please help me out.....

Thanks,
Veena
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Nitin Rajora

2010-Mar-09 09:48 UTC

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Re: Re: Re: Re: Re: Re: how to obtain the index of selected item from select box?

Hi Veena,

It is simple logic.. Instead of finding CurrentReadings by station_id, you
need to find CurrentReadings for stations_id for which
stations.state==SELECTED_STATE_VALUE

Files are attached have a look.

Nitin.

On Tue, Mar 9, 2010 at 2:22 PM, Veena Jose
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:
> Hai Nitin,
>
>    I am again disturbing you.....Your code is working fine for me.But i
> want something like this.
>
> 1. Readings table initially is showing all current_readings for all
> stations
> on index page
>
> 2. There is a stations dropdown filled with all the states in the
> "stations" table.(eg.,Karnataka,Mumbai etc)
>
> 3.When user selects a particular state from the dropdown, the table
> showing Readings.. should be updated for current_readings specific to
> selected state...(eg. If i select "karnataka" and i hav 2
stations in
> Karnataka it should update the readings of those two stations for
> current_readings)
>
> When i got your code i thought i can make the change very easily.I
> wasted this whole morning in doing this.I don''t know where i am
going
> wrong.
>
> Can you please help me out.....
>
> Thanks,
> Veena
> --
> Posted via http://www.ruby-forum.com/.
>
> --
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Veena Jose

2010-Mar-09 10:27 UTC

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Re: Re: Re: Re: Re: Re: how to obtain the index of selected item from select box?

Thank you sooooooooooooooooo much....

I was stuck with some syntax error.

Thanks Once Again....


Sincerely,
Veena
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Veena Jose

2010-Mar-09 10:59 UTC

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Re: Re: Re: Re: Re: Re: how to obtain the index of selected item from select box?

Hai Nitin,

    You have helped me a lot......
Can you please suggest me some good books or links where a newbie like 
me can understand Ruby on rails much better....

Thank you once again.........

Sincerely,
Veena
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Colin Law

2010-Mar-09 13:40 UTC

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Re: Re: Re: Re: Re: Re: Re: how to obtain the index of selected item from select box?

On 9 March 2010 10:59, Veena Jose
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>
wrote:> Hai Nitin,
>
>    You have helped me a lot......
> Can you please suggest me some good books or links where a newbie like
> me can understand Ruby on rails much better....

Try the Rails Guides at http://guides.rubyonrails.org/

Colin

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Nitin Rajora

2010-Mar-09 18:13 UTC

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Re: Re: Re: Re: Re: Re: Re: how to obtain the index of selected item from select box?

Veena,

I would suggest going through http://railscasts.com ......from episode 1st
till the end... and keep watching the newer episodes.
Ryan Bates is one of the best Rails Gurus there are....

Happy Women''s Day,
Nitin.
On Tue, Mar 9, 2010 at 4:29 PM, Veena Jose
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:
> Hai Nitin,
>
>    You have helped me a lot......
> Can you please suggest me some good books or links where a newbie like
> me can understand Ruby on rails much better....
>
> Thank you once again.........
>
> Sincerely,
> Veena
> --
> Posted via http://www.ruby-forum.com/.
>
> --
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Rails - Mar 2010 - how to obtain the index of selected item from select box?

how to obtain the index of selected item from select box?

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