refreshylist

_div.html.erb

  <table>
    <thead>
    <tr>
      <th>Item</th>
    </tr>
    </thead>

    <tbody>

    <% @list.each do |item| %>
        <tr>
          <td><%= item %></td>
        </tr>
    <% end %>
    </tbody>
  </table>

div.html.erb

<table>
  <thead>
  <tr>
    <th>Item</th>
  </tr>
  </thead>

  <tbody>

  <% @list.each do |item| %>
      <tr>
        <td><%= item %></td>
      </tr>
  <% end %>
  </tbody>
</table>

homepages_controller.rb

class HomepagesController < ApplicationController
  before_action :set_items, only: [:index, :div]

  layout 'application', except: :div

  # GET /homepages
  # GET /homepages.json
  def index
  end

  def div
  end

  private

    def set_items
      @list = (1..5).collect { |_| rand 0..10}
    end
end

index.html.erb

<p id="notice"><%= notice %></p>

<h1>Homepage</h1>

<div id="list_container">
<%= render 'homepages/div' %>
</div>

<br>
<button onclick="$('#list_container').load('/homepages/div');">Refresh</button>

routes.rb

Rails.application.routes.draw do
  # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
  get '/homepages', to: 'homepages#index'
  get '/homepages/div', to: 'homepages#div'
end