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How to replace button in another view with javascript? Remote: true for link_to of an action in has_many trrough assosiation

Sorry for the long title. I don't know how I got stuck this much.
I wanted to have a button (actually a link_to styled as a button) for FOLLOW / UNFOLLOW on remote. That's a Follow model where records are stored for Corporation and User (a User can follow a Corporation). The follow/unfollow links are on the Corporation show page.
<% if user_signed_in? %>
<% if Follow.where(corporation_id: #corporation.id, user_id: current_user.id).first.nil? %>
<%= link_to 'FOLLOW', {:controller => "follows", :action => "create", :user_id => current_user.id, :corporation_id => #corporation.id}, remote: true, :method => "post", class: "btns follow", id: "follow1" %>
<% elsif %>
<%= link_to 'UNFOLLOW', {:controller => "follows", :action => "destroy", :corporation_id => #corporation.id, :user_id => current_user.id }, remote: true, :method => "delete", class: "btns unfollow", id: "unfollow" %>
<% end %>
<% end %>
These are the controller actions:
def create
#corporation_id = params[:corporation_id]
#follow = Follow.new(follow_params)
#follow.save
respond_to do |format|
format.js {render :file => "/corporations/create.js.erb" }
end
end
def destroy
#corporation_id = params[:corporation_id]
attending.destroy
#attending is a method where the follow is defined. This is ok.
respond_to do |format|
format.js {render :file => "/corporations/destroy.js.erb" }
end
end
I'm rendering create.js.erb in corporations, since the change has to happen there. If I leave it as format.js, it'll search in the follows folder which is empty.
The create.js.erb look like this:
$("#unfollow").click(function(){
$("unfollow").replaceWith("<%= escape_javascript(render :partial => "corporations/profile/follow", :locals => {corporation_id: #corporation_id}) %>");
});
Btw, I tried .html instead of replaceWith, but it's not that.
The destroy.js.erb is similar. And the _unfollow.html.erb partial is like this:
<% if !#corporation.nil? %>
<%= link_to 'UNFOLLOW', {:controller => "follows", :action => "destroy", :corporation_id => #corporation.id, :user_id => current_user.id }, :method => "delete", class: "btns unfollow", remote: true, id: "unfollow" %>
<% else %>
<%= Rails.logger.info("First here") %>
<%= Rails.logger.info(corporation_id) %>
<%= link_to 'UNFOLLOW', {:controller => "follows", :action => "destroy", :corporation_id => corporation_id.to_i, :user_id => current_user.id }, :method => "delete", class: "btns unfollow", remote: true, id: "unfollow" %>
<%= Rails.logger.info("Now here...") %>
<% end %>
Without the first condition it just fires up an error the corporation_id (it's same with locales[:corporation_id]) is not defined and similar.
I have no idea what to try now... All the tutorials on the net are quite simple but the remote action is just one action in the controller where it needs to change, this has to go to another controller then back, then again to Follow... I'd really appreciate the help.

redirect_to causes template is missing error

I am making a transition from Rails 2 to Rails 3.
_role_item.html.erb view:
<% if #employee.has_role?(role.id) %>
<%= link_to image_tag('pman/checkbox_unchecked.jpg'), action: 'add_role', :employee_id => #employee.id, :role_id => role.id %>
<% end %>
Clicking the checkbox should assign a role to that Employee and redirect back to the partial page which contains a role_list and a privilege_list.
In my controller I have:
def add_role
#employee = Employee::OldEmployee.find(params[:employee_id])
#employee.add_role(params[:role_id])
redirect_to :action => 'employee_privileges', :employee_id => #employee.id
end
The view which has both partials, _employee_privileges.html.erb:
<h3> <%= #employee.full_name %> (<%= #employee.initials %>) <%= #assign_roles %> - PRIVILEGES & ACCESS</h3>
<br>
<table><tr><td valign=top>
<%= render :partial => 'role_list' %>
</td><td width=50>
</td><td valign=top>
<%= render :partial => 'privilege_list' %>
</td></tr></table>
<br>
employee_privileges.js.erb:
$("#roles").html("<%= j(render partial: 'employee_privileges') %>");
Function within controller:
def
employee_privileges
#employee = Employee::OldEmployee.find(params[:employee_id])
#roles = Acl::Role.find :all
#modules = Acl::Module.find :all
#module_privileges = Array.new
#general_privileges = Acl::Privilege.find :all, :conditions => 'module_id IS NULL'
if !#general_privileges.empty?
#module_privileges << [nil, nil, nil, #general_privileges]
end
#modules.each do |m|
if !m.privileges.empty?
#module_privileges << [m.id, m.name, m.description, m.privileges]
end
end
#assign_roles = flash[:assign_roles]
#render :partial => 'employee_privileges'
end
Currently, when clicking on the checkbox, I receive the error:
Missing template acl/acl/employee_privileges, application/employee_privileges with {:locale=>[:en], :formats=>[:html], :handlers=>[:erb, :builder, :coffee]}. Searched in: * "/home/alex/Intranet_update/app/views"
Any help would be appreciated.

Please provide the relative path in the for the partial you want to render.
$("#roles").html("<%= j(render partial: 'employee_privileges') %>");
option like render partial: '/folder_path/employe_privileges'

AJAX Fave Button Not Working Rails

I'm trying to allow users to favorite posts and then it show them sort of of interaction through AJAX, but it's not working.
The error I'm getting in the console is:
ActionView::Template::Error (undefined local variable or method `post_item' for #<#<Class:0x007fecb2a3d5f8>:0x007fecb2a357e0>):
The button is being rendered through a partial:
<%= render "shared/fave_form", post_item: post_item %>
Here's the code for the button (shared/_fave_form.html.erb):
<% if current_user.voted_on?(Post.find(post_item)) %>
<%= link_to "unlike", vote_against_post_path(post_item.id), :remote => true, :method => :post, :class => "btn") %>
<% else %>
<%= link_to "like", vote_up_post_path(post_item.id), :remote => true, :method => :post, :class => "btn") %>
<% end %>
Here's the toggle.js.erb file:
$("#fave").html("<%= escape_javascript render('fave_form') %>");

When you render the partial using toggle.js.erb it is not getting locals value post_item, you have to provide it in also.So, your js code should be something like following
$("#fave").html("<%= escape_javascript(render :partial=>"fave_form", locals: {post_item: post_item}).html_safe %>);
I guess you are using some ajax call and then your toggle.js.erb so in your toggle action you must specify value to post_item, lets make it instance variable #post_item so that we can use it in toggle.js.erb.
$("#fave").html("<%= escape_javascript(render :partial=>"fave_form", locals: {post_item: #post_item}).html_safe %>);

The partial is using a local variable, so pass post_item as a local:
<%= render :partial => "shared/fave_form", :locals => {post_item: post_item} %>

How to pass param['id'] to the index page

I am trying to render the user detail on index page when user is clicked.
I am having the list of users in index page like
<% #users.each do |user| %>
<%= link_to user.name, '', {:id => user.id, :name => 'user', :remote => true}
<% end %>
In my javascript
$('#mydiv').html("<%= escape_javascript(render(:partial => '/users/show', :locals => {:id => #{params['id']}})) %>"
but I couldn't able to render the user details, because param 'id' is not passing to this page.
How to get this param and render the partial in the index page when user is clicked.

In this case you should review your code a little. You should directly call the show method in your link and edit your controller to have it responding to JavaScript:
View code:
<%= link_to user.name, user_path(user), remote: true %>
Controller code:
def show
#user = User.find(params[:id])
respond_to do |format|
format.html
format.js
end
end
And create a new view called users/show.js.erb
$("#mydiv").html("<%= escape_javascript(render(:partial => '/users/user_show', :locals => {:user => #user})) %>");
This view is calling a partial view where you can render all your user data. This view is called users/_user_show.html.erb
<div class="myuser">
<%= user.name %>
</div>
Hope that helps

Auto populate a text field based on another text field

I am trying to auto-populate a text field based on the value of another input field. Currently trying to do this using observe_field helper like this:
<%= observe_field(
:account_name,
:function => "alert('Name changed!')",
:on => 'keyup'
) %>
<% form_for(#account, :html => { :id => 'theform' }) do |f| %>
<label for="accountname"> Account name </label>
<%= form.text_field :name, :tabindex => '1' %>
<label for="subdomain"> Subdomain </label>
<%= form.text_field :subdomain, :tabindex => '2' %>
<% end %>
When the user enters text in the account_name text_field, I want to copy that convert into a subdomain (downcase and join by '-') and populate to subdomain text_field.
But, in the process getting this error:
element is null
var method = element.tagName.toLowerCase(); protot...9227640 (line 3588)
Where exactly am I going wrong here? Or is there a better way to do this?

Put your "observe_field" inside the form tag and try again.
EDITED
your observe_field needs to be after the thing it's observing.
Hope that helps :)
For ex:-
<% form_for(#account, :html => { :id => 'theform' }) do |f| %>
<label for="accountname"> Account name </label>
<%= form.text_field :name, :tabindex => '1' %>
<%= observe_field(
:account_name,
:function => "alert('Name changed!')",
:on => 'keyup'
) %>
<label for="subdomain"> Subdomain </label>
<%= form.text_field :subdomain, :tabindex => '2' %>
<% end %>