So first things first, I have no idea how to use javascript. All I really know about it is that it allows me to change things without refreshing the page. I have no idea how to get my models/variables into javascript or where it falls in the timeline of asset service.

What I want is for the div containing the value @video.plusminus to update with the new value of @video.plusminus after the vote has been recorded.

show.html.erb:

<div>
<%= link_to "/videos/#{@video.id}/upvote", method: 'post', remote: true do %>
<i class="glyphicon glyphicon-chevron-up"></i>
<% end %>  
<div id="score"><%=@score%></div>

videos_controller.rb

def upvote
@video = Video.find(params[:id])
if current_user.voted_against?(@video)
  current_user.vote_exclusively_for(@video)
elsif current_user.voted_on?(@video)
  current_user.unvote_for(@video)
else
  current_user.vote_for(@video)
end
respond_to do |format|
  format.js
end
end

upvote.js.erb:

$("score").update.("<%= escape_javascript(render(@video.plusminus)) %>");

When I click the link, nothing happens, and I don't know why. If someone could explain the right way to do this to me, I'd be much obliged. I've never had to use javascript before and it's frustrating as hell.