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Ajax techniques allow developers to create Web applications that can seamlessly communicate with the server without a complete page refresh. Users of such applications will expect to see the page flicker whenever data is sent to or from the server. This flicker does not occur during Ajax requests, so the user may not know when data has been updated on the page. You ll likely change the style of some elements to indicate that some data on the page has changed; for example, you may highlight the name of a stock whose price was seamlessly updated via an Ajax request. You should set the style of an element through JavaScript using the setAttribute method of the element. For example, to change the text within a span element to be displayed in bold and in red, use the setAttribute method as follows: var spanElement = document.getElementById("mySpan"); spanElement.setAttribute("style", "font-weight:bold; color:red;"); This works well in all modern browsers except Internet Explorer. The workaround for Internet Explorer is to use the nonstandard but widely supported cssText property of the element s style object to set the desired style, as follows: var spanElement = document.getElementById("mySpan"); spanElement.style.cssText = "font-weight:bold; color:red;"; This method works well in Internet Explorer and most other browsers except Opera. To make the code portable across all modern browsers, use the setAttribute method in addition to the cssText property of the element s style object, like so: var spanElement = document.getElementById("mySpan"); spanElement.setAttribute("style", "font-weight:bold; color:red;"); spanElement.style.cssText = "font-weight:bold; color:red;";

sidebar region can be aware of content displayed in blocks in the footer region, something not possible in existing Drupal core. You can also create mini-panels, which makes it very easy to display content and blocks without needing to create custom regions or write a lot of CSS. Panels is a powerful module with a vast number of options and configuration settings. Navigate to http://drupal.org/node/496278 for documentation and to learn more.

CHAPTER 9 BEYOND WSE 3.0: LOOKING AHEAD TO WINDOWS COMMUNICATION FOUNDATION (WCF)

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After reading the previous section about setting an element s inline style via JavaScript, you ve probably decided that simply setting the element s class attribute must be the easiest way to go. Unfortunately, that is not correct. As with setting an element s inline style, quirks also exist when setting an element s class dynamically via JavaScript. As you ve probably guessed by now, Internet Explorer is the oddball amongst other modern browsers, although the workaround is rather simple. Browsers such as Firefox and Safari allow you to set an element s class attribute using the element s setAttribute method, like so: var element = document.getElementById("myElement"); element.setAttribute("class", "styleClass"); Oddly enough, Internet Explorer does not set the element s class attribute when using the setAttribute method and class as the attribute name. Instead, Internet Explorer recognizes the className attribute when used in conjunction with the setAttribute method. The complete workaround for this situation is to use both class and className as the attribute names when using the element s setAttribute method, like so: var element = document.getElementById("myElement"); element.setAttribute("class", "styleClass"); element.setAttribute("className", "styleClass"); Most modern browsers will use the class attribute name and ignore className, and Internet Explorer will do the opposite.

The Rules modules (http://drupal.org/project/rules) allows you to create actions that occur based on defined events. For example, you may want to create customized e-mails that are sent to users when a user account is created or create a custom redirection or system message after a user creates an account. Rules is a powerful and flexible module; navigate to http://drupal.org/node/298476 to learn more.

Not to be confused with XML sitemap, the Site map module (http://drupal.org/project/site_map) provides a one-page overview of your site, including nodes, taxonomy terms, RSS feeds, and more. This is an ideal module if you re looking for an easy, low-maintenance way to give users an overview of your site.

The transport and formatter layer is what enables messages to be moved across the wire. WCF supports a wide range of transport protocols, as shown in Table 9-2, which indicates the associated WCF object that abstracts the transport protocol information. Table 9-2. WCF-Supported Transport Protocols

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