You can make your js more general by doing this:

<h1>Users#new</h1>
<p>Find me in app/views/users/new.html.erb</p>

<%= link_to "Click me",
          {:controller => 'users',
           :action => 'get_info',
           :my_target => 'update_me'},

           :remote => true %>

<div id="update_me">Hello</div>
<div>world</div>


===

class UsersController < ApplicationController
  def new
    @title = "Sign up"
  end

  def get_info
    @target = params[:my_target]
    @data = 'world'
  end

end

==app/views/users/get_info.js.erb

$("<%= @target %>").update("<%= @data %>");

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