how to generate barcode in asp.net using c# 7-1. IMPLEMENTING AN AJAX SHOPPING CART in Font

Printing Code 39 Full ASCII in Font 7-1. IMPLEMENTING AN AJAX SHOPPING CART

CHAPTER 7 7-1. IMPLEMENTING AN AJAX SHOPPING CART
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The bold code illustrates how the document.cookie object is manipulated. The manipulation is rather peculiar and completely unorthodox. In the implementation of createCookie, a buffer is created and then assigned to document.cookie. Usually an assignment to a data member resets the value of the data member. Not so with the document.cookie data member. Assigning the data member either creates a new cookie or reassigns the value of an existing cookie. In the implementation of createCookie, the parameter days assign a time to the cookie being created, indicating that the cookie will expire. If the cookie and the function createCookie are not associated with a date time, then the cookie would expire the moment the browser is closed. When reading the data member document.cookie, the cookies applicable to the currently loaded domain and document are retrieved. The following could be an example value of document.cookie: cc=value1;shoppingcart=/pyservices/shopping/cart/toRedirected The value of document.cookie is problematic, because it is a string that contains multiple cookies. To find a single cookie, the string has to be parsed. The implementation of readCookie automatically manages the parsing and retrieves the value for a particular cookie identifier. The function eraseCookie uses the createCookie function to delete a cookie. Again, this is unorthodox, but it uses the functionality where assigning an expired date to a cookie will automatically delete the cookie. Having the Server Process Unique URLs With respect to the server side, the conversion of the action URL to a unique URL requires the ability to define an HTTP header. Based on the requirement, the algorithm to determine what the Location HTTP header should be is dependent on the context of the application. Once the unique URL has been determined and sent to the client, the client will add what are called specializations. For example, let s say that you re managing a shopping cart and have to process the URLs /shopping/cart/1224/additem, /shopping/cart/2344/additem, /shopping/ cart/56743/checkout, and /shopping/cart/8853/checkout. Current Web application infrastructures such as JSP ASP , .NET, or PHP have a difficult time processing these URLs because each URL is unique from the other, despite there being only two types of URLs from a pattern perspective: additem and checkout. There are two ways to solve this problem. The first is to use Apache, and the second is to create a filter. In either solution, you re taking the URL and converting it into a request that you can process using a standard HTTP handler. The first solution is to use Apache, because Apache contains an extremely useful handler called mod_rewrite.3 Using mod_rewrite, you have the ability to accept any URL request and convert the URL into something else. While I do like the fact that Apache has such a powerful tool to rewrite a URL, using it to process unique URLs, in my opinion, is a stopgap measure so that REST-based URLs can be used in the context of existing infrastructure. To rewrite the shopping cart examples, you would add the Apache mod_rewrite rules to the Apache configuration file and use them in combination with a reverse proxy. A reverse proxy enables Apache to call Microsoft Internet Information Services (IIS), Tomcat, or any other HTTP server as if the request were calling IIS, Tomcat, or any other HTTP server directly:
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3. If you plan on creating more complicated mod_rewrite rules, you would be well served to read Rich Bowen s book The Definitive Guide to Apache mod_rewrite (Berkeley, CA: Apress, 2006).
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CHAPTER 7 7-1. IMPLEMENTING AN AJAX SHOPPING CART
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RewriteEngine on RewriteRule ^/shopping/cart/(.*)/additem/(.*)$ /additem.php id=$1&additional=$2 RewriteRule ^/shopping/cart/(.*)/checkout/(.*)$ /checkout.php id=$1&additional=$2 In the rules, the first line is used to start up the mod_rewrite module. The second and third lines are the important rules. The first block of text is an identifier RewriteRule indicating that a URL rewrite example is being created. The second block of text that starts with a ^ character and ends with a $ character is a regular expression. The regular expression is used to test if the incoming URL matches one of the rules. If the regular expression maps successfully, then the rewritten URL is the third block of text. The overall intent of the mod_rewrite rules is to convert a REST-based URL into a traditional URL. The unique pieces of the URL are converted into query parameters. If you don t happen to use the Apache server, then you ll need to implement either a handler or filter with an architecture similar to Figure 7-4.
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Figure 7-4. Using a filter to redirect the request to a specific handler In Figure 7-4, the HTTP server receives the URL. Depending on the technology used, the first step is to call a filter. For example, IIS has Internet Server Application Programming Interface (ISAPI) filters or ASP .NET modules, Java has filters, and Apache has filters. The filter is responsible for being able to process the unique URL and converting the request into a specific handler. You should not have to jump through hoops to be able to process unique URLs.
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