Rails - Sep 2006 - AJAX/RJS issue: observe_form not passing in form params

I''m having a problem with an AJAX form. I currently have a working 
version as follows:


In my _picker.rhtml partial I have:

<%= observe_form "picker_form", :update =>
"frame_picker" ,
                                :loading_text => "Retrieving
price...",
                                :complete => visual_effect(:highlight, 
"picker_live_price", { :startcolor =>
"''#9b3801''", :endcolor =>
"''#f0c18e''", :duration => 0.5 }),
                                :url => { :controller =>
''store'',
:action => "update_picker" } %>


In my store_controller.rb controller I have:

 def update_picker
  @frame = Frame.find(:first, :conditions => ["category =
:category",
params[:frame]])
  @quantity = params[:picker_quantity]
  render :partial => ''/store/picker''
 end

If I inspect the params array in the controller, it looks like: 
{"action" => "update_picker", "frame" =>
{...}, "controller" => "store"}


This is all good and it works. However, for some usability reasons, I 
want to change this to use RJS. So, I''ve done the following:


In the partial, I removed the :update and :complete pieces of the 
observe_form call that will now be handled by the rjs template:

<%= observe_form "picker_form" :loading_text => "Retrieving
price...",
                               :url => { :controller =>
''store'', :action
=> "update_picker" } %>


In the controller, I removed the render call:

 def update_picker
  @frame = Frame.find(:first, :conditions => ["category =
:category",
params[:frame]])
  @quantity = params[:picker_quantity]
 end


I added the update_picker.rjs rjs template:

page[:frame_picker].replace_html :partial => ''picker''
page[:picker_live_price].visual_effect :highlight, :startcolor => 
"''#9b3801''", :endcolor =>
"''#f0c18e''"



This does not work - I get an error on the Frame.find line in the 
controller''s ''update_picker'' action, because
params[:frame] is nil. If I
inspect the params array, it looks like: {"action" =>
"update_picker",
"controller" => "store"}. Notice that the frame key and
values are no
longer there.

So, the problem appears to be that the form values are not getting 
passed through from the observe_form command to the controller in this 
second version. What have I done to account for the observe_form command 
changing what it is passing through to the controller?
>>> NOTE: The first field in my form is a radio button - does that make
any kind of difference?
I would appreciate any help.
thanks.

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Through some further research, I''ve discovered that adding

    :with => "value=value"

to the observe_form call solves the problem:

Anyone know why? Is this a rails bug?

thanks.

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I have a similar problem. My form uses 3 fields: 2 selects and a text
input.

when I look at the params, I get the updated version of the text input
but not for the selects. For these, I keep getting the last option in
the list what every I do.

I tried the :with thig and it didnt change anything.. anyone has an
idea?


Cayce Balara wrote:
> Through some further research, I''ve discovered that adding
>
>     :with => "value=value"
>
> to the observe_form call solves the problem:
>
> Anyone know why? Is this a rails bug?
> 
> thanks.
> 
> -- 
> Posted via http://www.ruby-forum.com/.

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Hi,

I too have been hitting the problem that if you omit the :updated
option in the observe_form or observe_field method, then no parameters
are sent.

An example of the js with an update option included: (note
parameters:value)

new Form.EventObserver(''firstname'', function(element, value)
{new
Ajax.Updater(''updated_names'',
''/customer/live_lookup'',
{asynchronous:true, evalScripts:true, parameters:value})})


If the :update is removed you get (note missing params):

new Form.EventObserver(''firstname'', function(element, value)
{new
Ajax.Request(''/customer/live_lookup'', {asynchronous:true,
evalScripts:true})})


Like you, I had been trying to use : with but was getting curious
results.  Thanks for your solution  :with=>''valjue=value''
works a
treat, although I dont understand why.  The js it produces is:

new Form.EventObserver(''firstname'', function(element, value)
{new
Ajax.Request(''/customer/live_lookup'', {asynchronous:true,
evalScripts:true, parameters:value=value})})


In fact I cannot understand the api explanation of :with.  I get the
gist of what it does, but cannot fathom exactly how to use it.  Can
anyone offer an improved explanation of how to use :with ?


Thanks Tonypm


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