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You can roll your own library for handling CGI requests. This process has some advantages, especially if you are trying to integrate your code into an existing code base. The disadvantages of this track are more apparent for complicated apps than for simple ones. I have found it convenient to embed miniweb servers in applications to provide easy access for clients and users. Although having your application as its own web server is probably not appropriate for every application, it is something to keep in mind because it can be a boon for control panels and for configuration of an application. Having the application as its own web server also reduces the external requirements for the application because they don t need to already be running a web server to use the functionality.

Notice that the hover is not a submenu but rather a detailed description of what lies beyond. The user will be more informed and therefore the overall satisfaction level will climb. If at all possible, you should seek to avoid minor page transfers when the functionality that you want is somewhat trivial. For example, let s say you have a Create User Account page with a textbox asking for the alias that a user wishes to register. On many sites, the user will enter an insane amount of registration data and click Submit, only to be met rudely by the obnoxious Username already taken. Click Back to try again. This particular process of try/ submit/fail/retry can be easily remedied. Digg (http://www.digg.com) has a registration page that uses Ajax to query the database for a preexisting username, saving users the headache of annoying page bounces (see Figure 5-7). After entering the requested username, the member-to-be clicks the check for availability button, and the page calls back to the server to check for the existence of the name. Following verification, the current page is updated with the acceptance/denial message without the need for a postback. More sites are beginning to adopt this methodology, and I wholeheartedly encourage it. Ultimately it cuts down on server bandwidth, as users will not be submitting entire page loads to the server only to find out, for the thirteenth time, that their desired username has been taken.

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The code in Listing 9-2 has a single class, FXTickerApp, which has a number of methods. The first is the initialize method, which creates the user interface elements you need. However, before you start creating user interface elements, you need to initialize the settings and load the stock symbols from the server:

Ocamlnet is a third-party library that provides a number of features (CGI functions are only one part). Ocamlnet provides a class-based interface to CGI, FastCGI, the Jserv protocol, an embedded web server, and the Post Office Protocol (POP).

class FXTickerApp include Fox def initialize(hostname, port_number, font_size = 100, quote_frequency=1, reload_csv_frequency=60) # Quote_frequency and reload_csv_frequency are in minutes

Capitalizing on the Apache web server, mod_caml provides a robust and functional environment in which to create web services. It also supports a templating mechanism, which enables you to separate your logic from presentation.

In the Ajax world of search and display, it is quite easy to bring content up to the browser dynamically. If you were to visit a community site where you ve sought out and found a particular blog post that was displayed with Ajax technology, the URL for the parent page would not reflect the dynamic content included within. The lack of proper method of URL referral becomes a bit frustrating if you find something online that you would like to refer to a friend or perhaps even bookmark for later. However, if you were to copy and paste the browser s URL, only the parent search page URL would be identifiable. This would leave you with the daunting task of describing to your friend the procedure they will have to endure if they want to see the same content. Not entirely a user-friendly process. Kayak (http://www.kayak.com), for example, has an awesome Ajax-driven flight-scheduling application that allows you to search for and find competitive airfares with very little page transfer (see Figure 5-8). After selecting your desired flight plan, you may choose to book the flights with the appropriate airlines themselves. While this concept is certainly not new, Kayak s method of user interaction outclasses that of many of their competitors. After spending some time with the application, you ll immediately notice that a lot of dynamic content has been built into the web interface. Kayak makes heavy use of Ajax, and it shows.

@hostname = hostname @port_number = port_number @quote_frequency = quote_frequency @reload_csv_frequency = reload_csv_frequency load_symbols_from_server

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