Hi all, I''m having problems with an observe_field, this is the view:
<%= form_tag %>
<div id="content">
<p>Customer:
<select name="cliente_id" id="cliente_id">
<option value="">Select a customer</option>
<%= options_for_select Cliente.find_all.collect {|c| [c.razon_social,
c.id]} %>
</select>
</p>
<%= observe_field :cliente_id,
:frequency => 0,
:url => {:controller => ''visitas'',
:action =>
''contactos_cliente''},
:update => ''contactos'',
:with => ''cliente_id'' %>
<div id="contactos"></div>
</div>
<%= end_form_tag %>
but it''s not working... it throws a javascript error:
Error: this.callback is not a function
Archivo Fuente:
http://localhost:3000/javascripts/prototype.js?1151586486
L?nea: 1625
(this is from Firefox)
I''ve included the :defaults javascript files...
Any idea what could be the problem?
thanks!!!
--
Posted via http://www.ruby-forum.com/.
Rolando Abarca wrote:> Hi all, I''m having problems with an observe_field, this is the view:<snip>> but it''s not working... it throws a javascript error: > > Error: this.callback is not a functionIt would probably help if you''d include the details of the error it''s throwing. Best regards, Bill
Bill Walton wrote:> It would probably help if you''d include the details of the error it''s > throwing. > > Best regards, > BillThat''s all I have, it''s a javascript error. It''s not generating neither a POST nor GET request to the server. regards, rolando.- -- Posted via http://www.ruby-forum.com/.
Hi Rolando, Rolando Abarca wrote:> That''s all I have, it''s a javascript error. It''s not generating neither > a POST nor GET request to the server.I just took another look at your code. Sorry I missed this yesterday but I think the problem''s in your <select>. The format is way wrong. For starters, it''s not enclosed in <%= %> so I''m pretty sure RoR will just treat it as text to render to the page and will not generate a select tag. I think the error you''re getting is telling you something like "I don''t observe things like text." That would also be why no POST is occurring. I''d recommend checking out the documentation on the select method at http://api.rubyonrails.org for the proper syntax for select and options_for_select because I''m pretty sure what you''ve got wrt options isn''t going to work either. hth, Bill
Bill Walton wrote:> I just took another look at your code. Sorry I missed this yesterday > but I > think the problem''s in your <select>. The format is way wrong. For > starters, it''s not enclosed in <%= %> so I''m pretty sure RoR will just > treat it as text to render to the page and will not generate a select > tag.I''m using a plain <select> html tag, not the select method from ActionView helpers... Anyway, I did this and it''s working now: <select name="select-cliente-id" id="select-cliente-id" onchange="new Ajax.Updater(''contactos'', ''/visitas/contactos_cliente'', {asynchronous:true, evalScripts:true, parameters:''cliente_id='' + value});"> I just hardcoded the Prototype Updater in the OnChange event of the select tag... Don''t know why this works and not the observer... regards, rolando.- -- Posted via http://www.ruby-forum.com/.
Rolando Abarca wrote:> I''m using a plain <select> html tag, not the select > method from ActionView helpers... > Anyway, I did this and it''s working now: > > <select name="select-cliente-id" id="select-cliente-id" onchange="new > Ajax.Updater(''contactos'', ''/visitas/contactos_cliente'', > {asynchronous:true, evalScripts:true, parameters:''cliente_id='' + > value});"> > > I just hardcoded the Prototype Updater in the OnChange event of the > select tag...Yes. That will definitely work.> Don''t know why this works and not the observer...Because the observer is a Rails helper method. It''s ''mission'' is to generate the Ajax code for you. But it can only to that with objects it ''knows about.'' By choosing not to use the Rails select method, you chose not to let Rails know about the object you asked it to observe. You might as well have asked it to observe a <p>. Rails can only help you if you let it. hth, Bill
Bill Walton wrote:> Because the observer is a Rails helper method. It''s ''mission'' is to > generate the Ajax code for you. But it can only to that with objects it > ''knows about.'' By choosing not to use the Rails select method, you > chose > not to let Rails know about the object you asked it to observe. You > might > as well have asked it to observe a <p>. Rails can only help you if you > let > it.mmm... but the first parameter to the observer_field method is a DOM id... so I thought I could use any valid DOM id...> hth, > Billregards, rolando.- -- Posted via http://www.ruby-forum.com/.
Rolando Abarca <funkaster@...> writes:> Bill Walton wrote: > > Because the observer is a Rails helper method. It''s ''mission'' is to > > generate the Ajax code for you. But it can only to that with objects it > > ''knows about.'' By choosing not to use the Rails select method, you > > chose > > not to let Rails know about the object you asked it to observe. You > > might > > as well have asked it to observe a <p>. Rails can only help you if you > > let > > it. > > mmm... but the first parameter to the observer_field method is a DOM > id... so I thought I could use any valid DOM id... > > > hth, > > Bill > > regards, > rolando.- >I had the same misconception that Rolando did -- I created my own checkbox field using HTML, with a unique name and id, and tried to use observe_field to observe it by referencing its id. I thought the first parameter to observe_field was the DOM id of the thing I wanted it to observe. Instead I''m trying to use rails to generate the checkbox for me, but I''m still getting the "this.callback is not a function" error in my Javascript console: <%= check_box_tag("private_check", :value => "1", :checked => true) %>Private <%= observe_field ''private_check'', :frequency => 0, :update => "private_span", :url => {:action => ''mark_private'', :only_path => false}, :with => "''p='' + escape(value)" %> Any ideas what I''m doing wrong? Does the observe_field only work with real form elements and not ones created using the _tag methods? Thanks, --Tessa --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
Tessa Lau wrote:> Instead I''m trying to use rails to generate the checkbox > for me, but I''m still getting the "this.callback is not a function" > error in my Javascript console: > > <%= check_box_tag("private_check", :value => "1", > :checked => true) %>Private > <%= observe_field ''private_check'', > :frequency => 0,You don''t need the :frequency option. The observer will fire when the check box changes state. I''d get rid of it.> :update => "private_span", > :url => {:action => ''mark_private'', :only_path => false},Is there some reason you''re setting :only_path to give you the fully qualified path? It''s probably not the problem. Just wondered what situation is driving it''s use.> :with => "''p='' + escape(value)" %>The purpose of the :with option in the case of observe_field is simply to provide the name for the key in the params hash the value in the field will be passed with. So if, in your controller action, you want to say something like: this_item = params[:p] then in your observe_field you''d use :with => ''p'' You can, of course, use a more descriptive key.> Any ideas what I''m doing wrong?My first guess would be that something about the syntax, maybe the order of your parameters, could be causing the problem. I''ve never had the error you''re getting but the documentation says: Required options are either of: :url: url_for-style options for the action to call when the field has changed. :function: Instead of making a remote call to a URL, you can specify a function to be called instead. The error you''re getting say''s Rails thinks you''re trying to tell it to call a function. I always put the url: => {} right after the field I''m watching. It''s a required field. The other stuff like :frequency and :with is optional.> Does the observe_field only work with real form elements > and not ones created using the _tag methods?I use it with the _tag methods. hth, Bill --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
Bill Walton <bill.walton@...> writes:> You don''t need the :frequency option. The observer will fire when the check > box changes state. I''d get rid of it. > ... > Is there some reason you''re setting :only_path to give you the fully > qualified path? It''s probably not the problem. Just wondered what > situation is driving it''s use.I was copying an example from the "Agile Web Development with Rails" book. After I got it to work I was planning to remove the things that aren''t necessary, but when just starting out I''ve found it''s always best to try to copy the working example as closely as possible!> The error you''re getting say''s Rails thinks you''re trying to tell it to call > a function. I always put the url: => {} right after the field I''m watching. > It''s a required field. The other stuff like :frequency and :with is > optional.Thanks! After playing around with removing various options, I discovered that removing the :frequency => 0 parameter causes it to work without an error. That''s confusing, because in the documentation for observe_field it says: :frequency: The frequency (in seconds) at which changes to this field will be detected. Not setting this option at all or to a value equal to or less than zero will use event based observation instead of time based observation. From that description I believed that setting :frequency => 0 would be equivalent to not setting :frequency at all, but that''s not the case. Perhaps it''s a bug in rails? I have rails v1.1.6. Anyway, I have it working now. Thanks for the help! --Tessa --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---