c# .net barcode generator free SHOPPING CART IMPLEMENTATION in Font

Draw UPC A in Font SHOPPING CART IMPLEMENTATION

CHAPTER 5 SHOPPING CART IMPLEMENTATION
UPC Code Creation In None
Using Barcode generation for Font Control to generate, create UPC-A Supplement 5 image in Font applications.
www.OnBarcode.com
UPCA Printer In None
Using Barcode maker for Font Control to generate, create UPC-A Supplement 5 image in Font applications.
www.OnBarcode.com
Now that we have a partial to show on the catalog pages, we need to add it to the layout file app/views/layouts/application.rhtml, as shown in Listing 5-1. We also add a few JavaScript include tags to get the power of the Prototype and script.aculo.us JavaScript libraries that come bundled with Rails (and which we ll need when we start using Ajax in our application, as described in the upcoming Implementing the Add Items to the Cart User Story section). Listing 5-1. Additions to the Application Layout File <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title><%= @page_title || 'Emporium' %></title> <%= stylesheet_link_tag "style" %> <%= javascript_include_tag :defaults %> </head> <body> <div id="header"> <h1 id="logo">Emporium™</h1> <h2 id="slogan">Books on Rails</h2> </div> <div id="menu"> <ul> <li><a href="/admin/author">Authors</a> | </li> <li><a href="/admin/publisher">Publishers</a> | </li> <li><a href="/admin/book">Books</a> | </li> <li><a href="/">Catalog</a> | </li> <li><a href="/about">About</a> </li> </ul> </div> <div id="content"> <%= "<h1>#{@page_title}</h1>" if @page_title %> <% if flash[:notice] %> <div id="notice"> <%= flash[:notice] %> </div> <% end %> <%= yield %> </div>
Printing Code 128 In None
Using Barcode encoder for Font Control to generate, create Code 128 Code Set B image in Font applications.
www.OnBarcode.com
Making EAN / UCC - 13 In None
Using Barcode generator for Font Control to generate, create UCC-128 image in Font applications.
www.OnBarcode.com
CHAPTER 5 SHOPPING CART IMPLEMENTATION
Barcode Generator In None
Using Barcode creator for Font Control to generate, create Barcode image in Font applications.
www.OnBarcode.com
EAN 13 Encoder In None
Using Barcode creation for Font Control to generate, create EAN-13 Supplement 5 image in Font applications.
www.OnBarcode.com
<% if @cart %> <div id="shopping_cart"> <%= render :partial => "cart/cart" %> </div> <% end %> <div id="footer"> © 1995-2006 Emporium </div> </body> </html> We also need to add a link for adding a book to the cart. We do that in the catalog/ _books.rhtml partial that is used to show every individual book item on the catalog pages: <dl id="books"> <% for book in @books %> <dt><%= link_to book.title, :action => "show", :id => book %></dt> <% for author in book.authors %> <dd><%= author.last_name %>, <%= author.first_name %></dd> <% end %> <dd> <strong> <%= link_to "+", :controller => "cart", :action => "add", :id => book %> </strong> </dd> <dd><small>Publisher: <%= book.publisher.name %></small></dd> <% end %> </dl> To make our shopping cart float on the catalog pages and look a bit nicer, we need to add some CSS rules to the style.css style sheet, as shown in Listing 5-2.
Code 3/9 Generator In None
Using Barcode maker for Font Control to generate, create Code 3/9 image in Font applications.
www.OnBarcode.com
Postnet 3 Of 5 Printer In None
Using Barcode maker for Font Control to generate, create Delivery Point Barcode (DPBC) image in Font applications.
www.OnBarcode.com
CHAPTER 5 SHOPPING CART IMPLEMENTATION
Generating UPC-A In Java
Using Barcode drawer for Java Control to generate, create UPCA image in Java applications.
www.OnBarcode.com
UPCA Generator In Objective-C
Using Barcode generation for iPhone Control to generate, create GTIN - 12 image in iPhone applications.
www.OnBarcode.com
Listing 5-2. Additions to the Style Sheet #shopping_cart { border-left: 3px solid #666; background: #aaa; position: fixed; bottom: 0; right: 0; width: 200px; height: 100%; padding: 5px 10px; } #shopping_cart ul, #shopping_cart li { list-style: none; margin: 0; padding: 0; } #shopping_cart h3 { padding-top: 4em; } #cart_notice { border: 2px solid #58A986; background: #B2FFD3; padding: 3px; position: absolute; top: 0; left: 10px; } body { background-color: #fff; color: #333; margin-right: 230px; }
Creating ECC200 In Java
Using Barcode generation for Java Control to generate, create Data Matrix ECC200 image in Java applications.
www.OnBarcode.com
Painting UPC A In Java
Using Barcode encoder for Android Control to generate, create UPC Symbol image in Android applications.
www.OnBarcode.com
CHAPTER 5 SHOPPING CART IMPLEMENTATION
QR Code 2d Barcode Recognizer In VS .NET
Using Barcode reader for VS .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
EAN / UCC - 13 Generator In Java
Using Barcode maker for BIRT Control to generate, create GS1 - 13 image in Eclipse BIRT applications.
www.OnBarcode.com
Notice the use of fixed positioning to make the shopping cart always appear above the fold. Now you can open the catalog index page in the browser, and it should look like Figure 5-1.
ANSI/AIM Code 128 Generator In .NET
Using Barcode generator for .NET Control to generate, create Code 128 Code Set A image in .NET applications.
www.OnBarcode.com
Code 128B Scanner In Visual Basic .NET
Using Barcode reader for .NET Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
Figure 5-1. Book catalog page with shopping cart
Make QR Code 2d Barcode In None
Using Barcode generator for Software Control to generate, create QR-Code image in Software applications.
www.OnBarcode.com
Encoding ANSI/AIM Code 128 In .NET
Using Barcode maker for Reporting Service Control to generate, create Code 128 Code Set A image in Reporting Service applications.
www.OnBarcode.com
Implementing the User Stories
Make Barcode In None
Using Barcode drawer for Office Excel Control to generate, create Barcode image in Excel applications.
www.OnBarcode.com
Quick Response Code Creator In None
Using Barcode encoder for Office Excel Control to generate, create QR image in Office Excel applications.
www.OnBarcode.com
With our shopping cart set up for action, we re ready to start implementing our user stories. Of course, we start with adding items.
Implementing the Add Items to the Cart User Story
We re going to use two approaches to implementing the Add Items to the Cart user story. One is the traditional way, which takes care of users whose browser doesn t support JavaScript. The other way will use Ajax techniques to provide a streamlined user interface.
CHAPTER 5 SHOPPING CART IMPLEMENTATION
The Traditional Way
We need to implement the action for adding an item to a cart in our CartController (in app/ controllers/cart_controller.rb), as follows: def add @book = Book.find(params[:id]) if request.post @item = @cart.add(params[:id]) flash[:cart_notice] = "Added <em>#{@item.book.title}</em>" redirect_to :controller => "catalog" else render end end The code checks whether the request was an HTTP POST or GET request and acts on that information. In the case of a form POST, we add the item, insert a notice to the flash hash, and redirect to the catalog controller. If the user got to the action by clicking a link, we show her a confirmation page with a form that points to the same action. Create app/views/cart/add.rhtml and add the following to it to implement the confirmation page: <strong>Please confirm adding <em><%= @book.title %></em> to your shopping cart.</strong> <%= button_to "Confirm", :action => "add", :id => params[:id] %> button_to is a Rails helper that behaves just like link_to, but instead of an anchor element, it creates an inline form with a single button. When a user clicks this button, she gets to the same add action, this time with a POST request, and will get the new item added to the cart. This might sound awkward, but there are two good reasons to make the application behave like this: You should never use GET requests (normal links) to change the state of a web application. So-called web accelerators (or link fetchers) often crawl through all the links of a loaded web page and fetch the linked pages while the user is reading the page. If fetching those links would result in adding random items to the shopping cart, we would probably end up with a bunch of less-than-happy customers. This traditional way to add items to a shopping cart will be visible to only the few customers who are using a browser that doesn t support JavaScript. In the next section, we will implement an interface that will be used by the vast majority of customers, and that is about gazillion times slicker than the approach described in this section.
Copyright © OnBarcode.com . All rights reserved.