Agile Web Development with Rails, Edition 4

11.3 Iteration F3: Highlighting Changes

Assign the current item to be the line item in question

edit app/controllers/line_items_controller.rb

  def create

    product = Product.find(params[:product_id])

    @line_item = @cart.add_product(product.id)

    respond_to do |format|

      if @line_item.save

        format.html { redirect_to store_url }

        format.js   { @current_item = @line_item }

        format.json { render action: 'show',

          status: :created, location: @line_item }

      else

        format.html { render action: 'new' }

        format.json { render json: @line_item.errors,

          status: :unprocessable_entity }

end

end

end

Add the id to the row in question

edit app/views/line_items/_line_item.html.erb

<% if line_item == @current_item %>

<tr id="current_item">

<% else %>

<tr>

<% end %>

  <td><%= line_item.quantity %>&times;</td>

  <td><%= line_item.product.title %></td>

  <td class="item_price"><%= number_to_currency(line_item.total_price) %></td>

</tr>

Animate the background color of that row

edit app/views/line_items/create.js.erb

$('#cart').html("<%= escape_javascript render(@cart) %>");

$('#current_item').css({'background-color':'#88ff88'}).

  animate({'background-color':'#114411'}, 1000);

Make the jquery-ui libraries available to the application

edit Gemfile

# Use jquery as the JavaScript library

gem 'jquery-rails'

gem 'jquery-ui-rails'

Install the gem

bundle install --local

Resolving dependencies...

Using rake (10.0.4)

Using i18n (0.6.4)

Using minitest (4.7.4)

Using multi_json (1.7.7)

Using atomic (1.1.9)

Using thread_safe (0.1.0)

Using tzinfo (0.3.37)

Using activesupport (4.0.0.rc1) from source at /home/rubys/git/rails

Using builder (3.1.4)

Using erubis (2.7.0)

Using rack (1.5.2)

Using rack-test (0.6.2)

Using actionpack (4.0.0.rc1) from source at /home/rubys/git/rails

Using mime-types (1.23)

Using polyglot (0.3.3)

Using treetop (1.4.14)

Using mail (2.5.4)

Using actionmailer (4.0.0.rc1) from source at /home/rubys/git/rails

Using activemodel (4.0.0.rc1) from source at /home/rubys/git/rails

Using activerecord-deprecated_finders (1.0.3)

Using arel (4.0.0.20130418133826) from source at /home/rubys/git/arel

Using activerecord (4.0.0.rc1) from source at /home/rubys/git/rails

Using bundler (1.3.5)

Using coffee-script-source (1.6.2)

Using execjs (1.4.0)

Using coffee-script (2.2.0)

Using thor (0.18.1)

Using railties (4.0.0.rc1) from source at /home/rubys/git/rails

Using coffee-rails (4.0.0) from source at /home/rubys/git/coffee-rails

Using hike (1.2.3)

Using jbuilder (1.4.2)

Using jquery-rails (3.0.1)

Using jquery-ui-rails (4.0.3)

Using json (1.8.0)

Using tilt (1.4.1)

Using sprockets (2.10.0)

Using sprockets-rails (2.0.0) from source at /home/rubys/git/sprockets-rails

Using rails (4.0.0.rc1) from source at /home/rubys/git/rails

Using rdoc (3.12.2)

Using sass (3.2.9)

Using sass-rails (4.0.0.rc2) from source at /home/rubys/git/sass-rails

Using sdoc (0.3.20)

Using sqlite3 (1.3.7)

Using turbolinks (1.2.0)

Using uglifier (2.1.1)

Your bundle is complete!

Use `bundle show [gemname]` to see where a bundled gem is installed.

Pull in the blind effect from the jquery-ui libraries

edit app/assets/javascripts/application.js

// This is a manifest file that'll be compiled into application.js, which will

// include all the files listed below.

//

// Any JavaScript/Coffee file within this directory, lib/assets/javascripts,

// vendor/assets/javascripts, or vendor/assets/javascripts of plugins, if any,

// can be referenced here using a relative path.

//

// It's not advisable to add code directly here, but if you do, it'll appear at

// the bottom of the compiled file.

//

// Read Sprockets README

// (https://github.com/sstephenson/sprockets#sprockets-directives) for details

// about supported directives.

//

//= require jquery

//= require jquery.ui.effect-blind

//= require jquery_ujs

//= require turbolinks

//= require_tree .