We Keep Coding

How to add Javascript to simple_form?

I'm using simple_form with Rails 3.2.5. I have a form that looks like this:
<%= simple_form_for(resource, :as => resource_name, :url => registration_path(resource_name), :html => {:class => 'form-vertical' }, :html => {:name => "new_user"}) do |f| %>
<%= f.error_notification %>
<%= f.input :field_one,
:placeholder => '30000',
:autofocus => true,
:required => true,
:html => {:onFocus => 'startCalc();'},
:html => {:onBlur => 'stopCalc();'} %>
# More form fields
<% end %>
I'm trying to call a Javascript driven calculation when a user enters a number in the form field, but the Javascript isn't showing up in the outputted HMTL:
<input autofocus="autofocus" class="numeric decimal required" id="field_one" name="user[field_one]" placeholder="30000" step="any" type="number" />
Does anyone know how to get simple_form to add these bits of Javascript?
Thanks!
Greg

I see my error now. As per the simple_form documentation, I need to use:
:input_html => {:onFocus => 'startCalc();'},
:input_html => {:onBlur => 'stopCalc();'}
This works!

fields_for with mongoid embeds_many nested documents

attempting to use this railscast as a guide:
http://railscasts.com/episodes/197-nested-model-form-part-2?view=asciicast
and running into this error:
`#search[queries_attributes][new_queries][queries' is not allowed as an instance variable name
models:
#search.rb
class Search
include Mongoid::Document
include Mongoid::Timestamps
belongs_to :user
field :name, :type => String
embeds_many :queries
accepts_nested_attributes_for :queries, :reject_if => lambda { |a| a[:content].blank? }, :allow_destroy => true
#query.rb
class Query
include Mongoid::Document
field :columns, :type => String
field :types, :type => String
field :keywords, :type => String
embedded_in :search, :inverse_of => :queries
end
searches controller :
def new
#search = Search.new
#search.queries.build
#3.times { #search.queries.build }
end
_form.html.haml partial:
= form_for(#search) do |f|
= f.label 'Name this search'
= f.text_field :name, :class => 'text_field'
= render :partial => 'query', :collection => #search.queries, :locals => { :f => f }
= link_to_add_fields "Add Query", f, :queries
.actions
= f.submit
_query.html.haml partial:
.fields
= f.fields_for "queries[]", query do |q|
= q.label 'Search Datatype'
= q.select :types, Query::TYPES
= q.label 'In Column'
= q.select :columns, #search.record_columns
= q.label 'For Keywords:'
= q.text_field :keywords, :class => 'text_field'
= q.hidden_field :_destroy
= link_to_function "remove", "remove_fields(this)"
searches helper:
module SearchesHelper
def link_to_add_fields(name, f, association)
new_object = f.object.class.reflect_on_association(association).klass.new
fields = f.fields_for(association, new_object, :child_index => "new_#{association}") do |builder|
render(association.to_s.singularize , :f => builder)
end
link_to_function(name, h("add_fields(this, \"#{association}\", \"#{escape_javascript(fields)}\")"))
end
end
javascript:
function remove_fields(link) {
$(link).prev("input[type=hidden]").val("1");
$(link).closest(".fields").hide();
}
function add_fields(link, association, content) {
var new_id = new Date().getTime();
var regexp = new RegExp("new_" + association, "g");
$(link).parent().before(content.replace(regexp, new_id));
}
when the line:
= link_to_add_fields "Add Query", f, :queries
is commented out, it works as expected, but I need to be able to add additional queries
via this helper.
for testing multi queries I am triggering the creation in the controller 3.times
also in the error message the last "]" is stripped off.. not sure what I am missing
sorry for all the tags, but not sure where the issue lies

looks like this was the fix:
= f.fields_for :queries, query do |q|

Two thoughts:
I would name the Query class something else, it probably conflicts with some stuff inside mongoid as per the error message you specified:
#search[queries_attributes][new_queries][queries' is not allowed as an instance variable name]
Also googling your problem I came across this:
http://www.jtanium.com/2009/11/03/rails-fields_for-is-not-allowed-as-an-instance-variable-name/
Something must be nil where it shouldn't be.

Problems adding fields in nested form through jQuery form railscasts episode

i have followed the railscasts episode on nested forms(part 1 and 2) and having difficulty with adding fields using jquery, however when i click the remove fields link, the field gets removed.
Here is the code.
In my question model i have
class Question < ActiveRecord::Base
has_many :tags, :class_name => "Tag", :dependent => :destroy, :foreign_key => "question_id"
accepts_nested_attributes_for :tags, :reject_if => lambda { |a| a[:keyword].blank? }, :allow_destroy => true
In my tag model i have
class Tag < ActiveRecord::Base
attr_accessible :keyword, :question_id
belongs_to :question, :class_name => "Question", :foreign_key => 'question_id'
end
In my question form i have
<%= form_for #question, :url => { :controller => "questions", :action => "create" } do |f| %>
<%= f.label(:name, "Request Question:") %>
<%= f.text_field(:name, :size => 72, :maxlength => 120) %><br />
<%= f.fields_for :tags, :url => { :controller => "tags", :action => "create" } do |builder| %>
<%= render "tag_fields", :f => builder %>
<% end %>
<p><%= link_to_add_fields "Add new tag", f, :tags %></p>
<% end %>
In my tag_fields partial
<p class="fields">
<%= f.label(:keyword, "Keywords:") %>
<%= f.text_field(:keyword, :size => 20, :maxlength => 25) %>
<%= link_to_remove_fields "remove", f %>
</p>
In application_helper.rb
module ApplicationHelper
def link_to_remove_fields(name, f)
f.hidden_field(:_destroy) + link_to_function(name, "remove_fields(this)")
end
def link_to_add_fields(name, f, association)
new_object = f.object.class.reflect_on_association(association).klass.new
fields = f.fields_for(association, new_object, :child_index => "new_#{association}") do |builder|
render(association.to_s.singularize + "_fields", :f => builder)
end
link_to_function(name, h("add_fields(this, \"#{association}\", \"#{escape_javascript(fields)}\")"))
end
end
Then finally in my application.js
function remove_fields(link) {
$(link).prev("input[type=hidden]").val("1");
$(link).closest(".fields").hide();
}
function add_fields(link, association, content) {
var new_id = new Date().getTime();
var regexp = new RegExp("new_" + association, "g")
$(link).parent().before(content.replace(regexp, new_id));
}
I have checked to see if files are included in page source. The jquery works because
other parts of my app are working. I do not get any error when i click add new tag.
I have looked at other solutions, but none work for me. I cannot seem to add a field.
Thanks for the help

I managed to figure this on out, but i am not sure if it is the best way.
In application_helper.rb i changed the following line from this
link_to_function(name, h("add_fields(this, \"#{association}\", \"#{escape_javascript(fields)}\")"))
to this
link_to_function(name, "add_fields(this, '#{association}', '#{escape_javascript(fields)}')", :remote => true)
i am not 100% sure why it works, but i believe its got to do with rails 3 no longer having the link_to_function. Hope this help

How to pass a variable to render?

This is the line in my new.js.erb that calls the render function
$('.node_container').append("<%= escape_javascript(render(#care_point, :locals => {:care_map => #care_map}))%>");
Gives error message:
ActionView::Template::Error (undefined local variable or method `care_map'
for my partial _care_point.html.erb:
<%= link_to 'Delete', [care_map, care_point], :confirm => "Are you sure?", :method => :delete, :remote => true, :class => 'delete' %>

To pass locals variables, you must use
render :partial => partial_name, :locals => { # all your vars here }
and not the mere:
render #var
See doc here, para 3.4.4.

text field with dropdown in rails

I'm trying to build a form field that can either accept a text entry, or select an option from a dropdown. In rails, the autocomplete plugin is close to what I need, except I want the dropdown to be available before the user types anything in the text field. Is there an example of this out there somewhere?
thx for the help,
-C

I have used this code on a view to select a date or enter a name (I hope you read HAML):
%center
- form_remote_tag :update => 'filter_counts', :url => { :action => 'name_filter', :controller => 'dictated_exams', :method => :post } do
Please enter part of a name ('%' is the wildcard character):
= text_field_tag 'search', nil, :maxlength => 15, :size => 15
= submit_tag 'Search'
%b OR
pick the exam date:
= calendar_date_select_tag "date", Date.today, :time => false, :valid_date_check => "date < (new Date()).stripTime()"
= image_tag "spinner.gif", :align => "absmiddle", :border => 0, :id => "spinner", :style => "display: none;"
= observe_field :date, :with => :date, :frequency => 1, :url => {:action => 'filter_widget', :controller => 'dictated_exams', :method => :post }, :update => :filter_counts, :before => "Element.show('spinner')", :success => "Element.hide('spinner')"
On the other hand, maybe you're just looking for this:
Rails' observe_form method
Basically, the question is : do you need to have those two methods of entry in a single form, or can they be separate? If so, you can also watch them separately.