POS-Server/app/views/customers/create.js.erb

$("#error_explanation_remote_customer").html("")
<% if @customer.errors.any? %>
	$('#error_explanation_remote_customer').removeClass('hidden');
    <% @customer.errors.values.each do |message| %>
        $("#error_explanation_remote_customer").append($("<li />").html("<%= message.first.to_s %>"));
    <% end %>
<% else %>
	$('#sale_customer_id').append($('<option>', {
	    value: <%= @customer.id %>,
	    text : '<%= @customer.nick_name %>'
	}));
	$('#sale_customer_id').select2();
	$("#sale_customer_id").val(<%= @customer.id %>).trigger("change");
	$('#dialog').modal('toggle');
<% end %>