How to render partial on the same page after clicking on link_to with AJAX

You basically want to use AJAX to display a customer's details. For this you can use the remote: true option provided by rails for the link_to helper. What we are going to do next :

1. Create a div that will contain the loaded data. In this case div#current_customer

2. Add remote: true to your link :

   <td><%= link_to 'Show', customer, remote: true %></td>

3. Name your partial customers/_show.html.erb (don't forget the _so it can be called as a partial) :

   <p>   <strong>Name:</strong>   <%= @customer.name %>   <%= @customer.id %></p><%= link_to 'Edit Customer', edit_customer_path(@customer) %> |<%= link_to 'Back', customers_path %> # You should remove this link

4. Respond to Javascript in the show method in CustomersController :

   respond_to do |format|  format.js {render layout: false} # Add this line to you respond_to blockend

5. Create your show.js.erb view, which is going to handle the front-end changes when respond_to :jsis gonna be called (In this case triggered by remote: true)

6. Tell show.js.erb what it must do (Replace #current_customer content with your partial, using the right @customer) :

customers/show.js.erb

$("#current_customer").html("<%= escape_javascript(render partial: 'customers/show', locals: { customer: @customer } ) %>");

customers/index.html.erb

<div id="current_customer"> # This will will contain the partial </div>