Load Rails partial with passed values using AJAX? - ruby-on-rails

Question

In my Rails app users have folders, and inside these folders are posts that they can add. Right now I have the folders displaying in my view like this:
<% current_user.folders.each do |folder| %>
<a href='#' id="addSubmissions">
<div id="post-container">
<%= folder.title %> <p id="created-time">Created <%= folder.created_at.strftime("%e/%-m") %></p>
</div>
</a>
<% end %>
What I'd like to do is load the submissions associated with a folder into a div when the #addSubmissions link is clicked. I've tried testing it out with this:
$('#addSubmissions').click(function(){
$('#post-container').append('<%= render :partial => 'contents', :locals => {:folder => folder } %>');
});
But it seems like that render code actually needs to be local beforehand.
The _contents.html.erb partial works, and is pretty simple:
<%= folder.title %>
<% folder.submissions.each do |i| %>
<%= i.title %>
<% end %>
How could I go about doing this? Again, I want to be able to click the link of a folder and load the submissions inside the folder into a div in the view. I'm thinking AJAX might be the solution, but I'm pretty new to Ruby so I don't know how to implement this.

Answer 1

This way it won't work. You need contoller method, which responds to JS, because you are fetching pure ruby variables.
Instead of:
<a href='#' id="addSubmissions">
you might try:
<%= link_to folder_content_path(folder), :remote=>true, :class=> "addSubmissions", :id=>folder.title %>
<div class="post-container" id="<%= folder.title %>">
<%= folder.title %> <p id="created-time">Created <%= folder.created_at.strftime("%e/%-m") %></p>
</div>
or other method name you want. Also note, that ID should be unique for page, otherwise you won't get expected result. Here I use folder name as ID, it probably unique, and it is easy way to find div we want modify with JS.
def folder_content
#folder=Folder.find(params[:id])
respond_to do |f|
f.js
end
end
folder_content.js.erb:
$("#"+"<%=#folder.title %>").append('<%= j render :partial => 'contents', :locals => {:folder => #folder } %>');