Rails - Oct 2008 - select another value in a combo box with a button click

Hi, I was wondering if anyone can help me with this as I just don''t
seem
to figure out how I can refer to a combo box and change its selected
value to another with a button click.
Suppose a cambo box has values ''1'', ''2'', and
''3'' and I have a button
"Next" and that currently ''1'' is selected in the
combo box. So, when I
click "Next" button I want it to select ''2'' and so
on...

Thanks.
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Hi Jay,

Jay Pangmi wrote:
>
> Hi, I was wondering if anyone can help me with this as I just
don''t seem
> to figure out how I can refer to a combo box and change its selected
> value to another with a button click.
> Suppose a cambo box has values ''1'',
''2'', and ''3'' and I have a button
> "Next" and that currently ''1'' is selected in
the combo box. So, when I
> click "Next" button I want it to select ''2'' and
so on...
If I understand your question,  one way I''ve done it is to put the
combo box
in a partial with the selected value ''fed'' and then use Ajax /
RJS to
re-render the partial as part of the "Next" action.

HTH,
Bill


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Jay Pangmi wrote:
> Hi, I was wondering if anyone can help me with this as I just
don''t seem
> to figure out how I can refer to a combo box and change its selected
> value to another with a button click.
> Suppose a cambo box has values ''1'',
''2'', and ''3'' and I have a button
> "Next" and that currently ''1'' is selected in
the combo box. So, when I
> click "Next" button I want it to select ''2'' and
so on...
>
> Thanks.
> --
> Posted via http://www.ruby-forum.com/.
We can achieve the same effect purely on the client-side.

Assuming your select dropdown is named "dropdown":

<input type="button" value="Next"
onclick="if($(''dropdown'').length -
1
> $(''dropdown'').selectedIndex)
$(''dropdown'').selectedIndex++;" />
This requires Prototype, btw.
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Hi, guys thanks for all the help. Here''s how I have created the combo 
box:

<%=select :camp, :id, @campsites_list%>

So, how would I reference it and its a partial and its under 
_campsites.rhtml (partial file).
Thanks.

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On Oct 10, 12:16 pm, Jay Pangmi
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
> Hi, guys thanks for all the help. Here''s how I have created the
combo
> box:
>
> <%=select :camp, :id, @campsites_list%>
>
> So, how would I reference it and its a partial and its under
> _campsites.rhtml (partial file).
> Thanks.
>
> --
> Posted viahttp://www.ruby-forum.com/.
I still think that a client-side JS is better here, since IMHO an AJAX
call just to select the next item of an already populated select
dropdown is simply too much.

<%= submit_tag "Next",
:onclick => "if($(''camp'').length - 1 >
$(''camp'').selectedIndex) $
(''camp'').selectedIndex++; return false;" %>
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Erol Fornoles wrote:
> <%= submit_tag "Next",
> :onclick => "if($(''camp'').length - 1 >
$(''camp'').selectedIndex) $
> (''camp'').selectedIndex++; return false;" %>
Thanks Erol Fornoles for the answer.. but I just couldn''t make any use
of it coz it doen''t work and I''m using
<%=javascript_include_tag
"prototype.js"%>. To make clear what I''m doing here is my
code:

VIEW:
===============================================================================<p>
    <label for = "walk location">Locations</label><br
/>
    <%= select(:walks, :id, Greatwalk.find_available_locations,
        {:prompt=>''Select Great Walk Location''}, :selected
=> nil, :id
=> :great_walks) %>
</p>
    <%= observe_field("great_walks", :url => {:controller =>
"user",
            :action => "update_campsites"},
                    :update => "campsites_list", :with =>
"id")%>
<%form_for :cart, :url => {:action => :add_to_cart} do |form|%>
  <div id ="campsites_list" >
      <p>
           <label for = "camp
location">Campgrounds</label><br />
           <%= form.select "campsite", %w{ ---- }, :class =>
"select_campsites" %>
      </p>
  </div>
  <p>
    <label for = "arrival date">Arrival
Date:</label><br />
    <%= form.text_field :arrival_date %>
  </p>
  <p>
    <label for = "nights">Nights:</label><br />
    <%= form.text_field :nights %>
  </p>
  <p>
    <label for = "parents">Parents:</label><br />
    <%= form.text_field :parents %>
  </p>
  <p>
    <label for = "children">Children:</label><br />
    <%= form.text_field :children %>
  </p>
  <p>
    <label for = "family claim">Family Rate:</label><br
/>
    <%= form.check_box "family_claim",{}, "1",
"0"%>
  </p>

  <%=submit_tag "Calculate"%>
<%end%>
<%= submit_tag "Next",
:onclick => "if($(''camp'').length - 1 >
$(''camp'').selectedIndex) $
(''camp'').selectedIndex++; return false;" %>
===============================================================================
PARTIAL:
===============================================================================<p>
  <label for="camp
location">Campgrounds</label><br/>
  <%=select "camp", "id", @resultset %>
</p>
===============================================================================
As you can see, I will be updating combo box in the partial. Also, what
I want to do is make two buttons inside the form and if I click one it
will change the value of combo box to next and if I click another some
action will be call (add_to_cart in my case).
Thanks again..
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On Oct 10, 1:54 pm, Jay Pangmi
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
> <p>
>   <label for="camp
location">Campgrounds</label><br/>
>   <%=select "camp", "id", @resultset %>
> </p>
Where is the partial rendered? And when should it be rendered? I don''t
see it in your main view.
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Erol Fornoles wrote:
> On Oct 10, 1:54�pm, Jay Pangmi
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
> wrote:
>> <p>
>> � <label for="camp
location">Campgrounds</label><br/>
>> � <%=select "camp", "id", @resultset %>
>> </p>
> 
> Where is the partial rendered? And when should it be rendered? I
don''t
> see it in your main view.
The file below is the partial which gets rendered in the <div> whose id 
is "campsites_list" in the view inside the <%form_for%> ...
<%end%>.
observe_field is observing the combo box with id :great_walks which is 
the first combo box in the view and updates the combo box inside the 
<%form_for%>..<%end%> inside <div> and this <div> is
getting updated
with the following partial file:

_campsites.rhtml
--------------------------------------------------------------------------------
<p>
  <label for="camp
location">Campgrounds</label><br/>
  <%=select "camp", "id", @resultset %>
</p>
--------------------------------------------------------------------------------

thanks...

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On Oct 10, 1:54 pm, Jay Pangmi
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
> Thanks Erol Fornoles for the answer.. but I just couldn''t make any
use
> of it coz it doen''t work and I''m using
<%=javascript_include_tag
> "prototype.js"%>. To make clear what I''m doing here
is my code:
Try this instead:

<%= submit_tag "Next", :onclick =>
"if($(''camp_id'').length - 1 > $
(''camp_id'').selectedIndex)
$(''camp_id'').selectedIndex++; return
false;" %>
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Erol Fornoles wrote:
> On Oct 10, 1:54�pm, Jay Pangmi
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
> wrote:
>> Thanks Erol Fornoles for the answer.. but I just couldn''t make
any use
>> of it coz it doen''t work and I''m using
<%=javascript_include_tag
>> "prototype.js"%>. To make clear what I''m doing
here is my code:
> 
> Try this instead:
> 
> <%= submit_tag "Next", :onclick =>
"if($(''camp_id'').length - 1 > $
> (''camp_id'').selectedIndex)
$(''camp_id'').selectedIndex++; return
> false;" %>
Thanks a tonn man... it works sweet. So, :camp, :id in the partial 
becomes ''camp_id'' and represents the combo box???
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On Oct 10, 6:04 pm, Jay Pangmi
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
> Thanks a tonn man... it works sweet. So, :camp, :id in the partial
> becomes ''camp_id'' and represents the combo box???
> --
> Posted viahttp://www.ruby-forum.com/.
Yeah, select :camp, :id generates a select tag with an id of "camp_id"
and a name of "camp[id]".
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