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Visit the Modules page to rebuild the theme registry so your changes will be recognized. When you visit a page in your web browser, you should see the Show Blocks button, and clicking it should reveal the blocks via a gradual fade-in effect instead of the slide effect we were using earlier. Congratulations! You ve learned how to use jQuery in your module, how to write it in a way that is friendly to themers and other developers, and coincidentally, how to cleanly override or enhance JavaScript files provided by other module developers who have been equally courteous. Before we leave this example, let me demonstrate how to override a template file. First, remove the bartik_blockaway_javascript() function that you added to the template.php file. Next, in your current theme, create an empty file called blockawayjavascript. tpl.php. For example, if you are using the Bartik theme, create themes/bartik/blockaway-javascript.tpl.php. Don t put anything inside this file. Now visit the Modules page. The act of visiting this page will rebuild the theme registry. Drupal will find the template file and use it instead of the theme function in your module. The result is that blockaway.js will never be loaded; you ve essentially commented out the theme function by creating an empty template file (recall from 9 that, when building the theme registry, Drupal will look for a template file and then for theme functions).

Gets a value indicating whether the page is being loaded in response to a client postback or whether it is being loaded and accessed for the first time Establishes the master page for the current page Provides access to the current HTTP request Allows you to interact with the outgoing HTTP response Provides access to the HttpServerUtility object, which contains various serverside helper functions Allows you to interact with the session data for the current caller Gets or sets the name of the theme used for the current page Provides access to a TraceContext object, which allows you to log custom messages during debugging sessions

As you saw earlier in this chapter, the basic flow of a web application begins with a client requesting a web page, possibly filling in user information, and clicking a Submit button to post back the HTML form data to a given web page for processing. In most cases, the opening tag of the form statement specifies an action attribute and a method attribute that indicates the file on the web server that will be sent the data in the various HTML widgets, as well as the method of sending this data (GET or POST): <form name="defaultPage" id="defaultPage" action="http://localhost/Cars/ClassicAspPage.asp" method = "GET"> ... </form> All ASP.NET pages support the System.Web.UI.Page.Request property, which provides access to an instance of the HttpRequest class type (see Table 32-5 for some common members of this class).

Now, add the following to your blockaway-javascript.tpl.php file: < php drupal_add_js(path_to_theme() . '/blockaway.js'); > When you reload your page, you should see that the JavaScript file is now loading. Do you see how these techniques can be useful for substituting your own enhanced JavaScript file in a third-party module or for preventing some JavaScript from loading

ApplicationPath Browser Cookies FilePath Form Headers HttpMethod IsSecureConnection QueryString RawUrl RequestType ServerVariables UserHostAddress UserHostName

Gets the ASP.NET application s virtual application root path on the server Provides information about the capabilities of the client browser Gets a collection of cookies sent by the client browser Indicates the virtual path of the current request Gets a collection of HTTP form variables Gets a collection of HTTP headers Indicates the HTTP data transfer method used by the client (GET, POST) Indicates whether the HTTP connection is secure (i.e., HTTPS) Gets the collection of HTTP query string variables Gets the current request s raw URL Indicates the HTTP data transfer method used by the client (GET, POST) Gets a collection of web server variables Gets the IP host address of the remote client Gets the DNS name of the remote client

Note You cannot call drupal_add_js() from inside page.tpl.php or any theme functions that are called in its preprocessing (such as blocks), because they are executed too late in the page building process. See modules/block/block-admin-display-form.tpl.php for an example of a core template file that adds JavaScript.