Render partial on button click - ruby-on-rails

Question

I'm having trouble rendering a particle on a button click. I'm getting the error
HelpController#FAQ_help is missing a template for this request format
and variant. request.formats: ["text/html"] request.variant: []
main_page.html.erb
<%= link_to "FAQ", FAQ_help_path %>
<div id="content">
</div>
help_controller.rb
def FAQ_help
respond_to do |format|
format.html {}
format.js
end
end
FAQ_help.js.erb
$('#content').html("<%= render :partial => 'FAQ_help' %>");
_FAQ_help.html.erb
<div>
<h1> This is the FAQ </h1>
</div>
routes.rb
get 'FAQ_help', to: 'help#FAQ_help'

Answer 1

How about this:
# main_page.html.erb
<%= link_to "FAQ", FAQ_help_path, remote: true %>
And
# faq_help.js.erb
$('#content').html("<%= escape_javascript(render :partial => 'FAQ_help')%>")
#fixed syntax
Cheers!

Answer 2

Since you have created a method for this request I would define it a little more for clarity:
def FAQ_help
respond_to do |format|
format.html {}
format.js {render: FAQ_help}
end
end
If you want to keep your controllers clean I would pass a param with the link and check if the pram is present if it is render FAQ partial:
View:
<link_to "Your FAQ" your_path, data: {method: :get, :remote => true, params: { faq: "#{current.user_name}" }.to_param }, :class =>"button" %>
Controller:
if params[:faq].present?
respond_to do |format|
format.html {}
format.js {render: FAQ_help}
end
else
respond_to do |format|
format.html {}
format.js {} #your default view for this method
end
end
This is handy to display IE:different content as per the request
ie: parms =bob # displays bobs FAQ
ie: parms =ted # displays teds FAQ
This technique is similar to what you would implement to create a search.