Ajax sorting of page results using jQuery

jQuery-ajax-load.js

  $('img#spinner').hide();
  
  // Sort products by size selected from dropdown
  $('form select#size').change(function() {
    $('img#spinner').show();
     var size = $("select#size").val();
     
     if ($.getUrlVar('keywords')) {
       var keywords =  $.getUrlVar('keywords');
       var url = "/products?size=" + size + "&keywords=" + keywords + " ul.product-listing";
     } else {
       var url = "/products?size=" + size + " ul.product-listing";
     }
     $('#products-list').load(url, function() {$('img#spinner').hide();});

  });

products_controller.rb

class ProductsController < ApplicationController

def index

  if params[:size] == "asc"
    @products = Product.ascend_by_master_width
  elsif params[:size] == "desc"
    @products = Product.descend_by_master_width
  else
    @products = Product.all
  end

  respond_to do |format|
    index.html
    index.js { render :partial => '/shared/products' }
  end
end