On Feb 13, 11:39 pm, Enzo Rivello <[email protected]>
wrote:
> Hi there!
>
> I need to use observe field to change dynamically one select field based
> on another select field:
>
> here is the view:
>
> <%= observe_field 'class', :url => { :action => 'update_list' },
> :frequency => 0.25,
> :update => 'nickname',
> :with => 'tipid'
> %>
>
> Class:<select name="<%= "#{name}[][#{name}_class]" %>" id="class">
> <%= options_from_collection_for_select(Tiprod.find(:all),
> "id","name", {:include_blank => true}) %>
> </select>
> Name:<select name="<%= "#{name}[][#{name}_data]" %>" id="nickname">
> <option></option>
> </select>
>
> here is the controller
>
> def update_list
> @tipid = params[:tipid]
> @products = Specprod.find(:all, :conditions => ['tiprif LIKE ?',
> "%...@tipid}%"])
> end
>
> and here is the update_list.rhtml
>
> <% for product in @products%>
> <option value="<%= product.id %>"><%= product.name%></option>
> <% end %>
>
> inspired
> by:http://nealenssle.com/blog/2007/04/12/how-to-dynamically-update-form-...
>
The observe_field helper just produces some javascript that does stuff
to the element with id class
You've got the call to observe_field before your select element, ie
it's trying to observe something that doesn't exist yet.
Fred
> Now, when i try to fire this application, the script doesn't work, and
> the JS console tell me "Element is null" .
> Why?Where i was wrong?
>
> thanks in advance for the help
> --
> Posted viahttp://www.ruby-forum.com/.
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