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Ajax wouldn t be particularly useful if you had no way to dynamically update the page s contents based on the results of a request. Today s modern browsers expose the contents of a Web page as an object model in accordance with the W3C DOM standards. This object model allows scripting languages such as JavaScript to add, update, and remove content on the page without the need for a round-trip to the server. While some quirks still exist, most Web pages written according to W3C standards and modified using standard JavaScript will behave identically in any standards-compliant browser. Most of today s modern browsers also support the nonstandard innerHTML property, which can be used to update the elements on a Web page. You are now familiar with the XMLHttpRequest object and how you can use it to seamlessly communicate with the server. You also know how to update the Web page s contents dynamically. What s next 4 offers a glimpse into the endless possibilities now afforded by Ajax. It s one thing to know how to use Ajax, but it s a completely different thing to apply it in a useful setting. The next chapter introduces situations common to Web applications that are prime candidates for Ajax techniques.

The business assembly is the sole location for implemented business logic and the final destination for incoming service requests. The previous listing looks very spare because it does not show the implementation code for any of the methods. You can refer to the sample project to view the full code listing. Very little implementation code is shown in this chapter because it is of secondary importance. It is more important that you feel comfortable with the interfaces and the architecture of the components.

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The only reason you do not want to select Published as the default option is if the site administrator (or someone else) needs to approve content before it is published. The Promoted to front page check box works only when the site is configured with the default homepage (or when a view is configured to use the check box, covered in 7). Selecting the Sticky at top of lists check box sends the node to the top of a list (once again, if configured with the default homepage; see 7 for exceptions). If Create new revision is selected, every time a node is edited, a revision is created. This can become very cumbersome to manage on sites where content is frequently updated, especially if there are more than ten revisions of a node. However, note that many developers frequently turn this on and forget about it, relying on the end user to manage and delete revisions.

ou ve been introduced to Ajax technology, you know how to use the XMLHttpRequest object, and you want to put it all together. But how To what sorts of scenarios should you apply Ajax technology Of course, its potential uses are nearly limitless. This chapter will demonstrate some situations where you can use Ajax techniques to really turbocharge your application. Some are obvious, and some aren t, but either way, as you gain more experience with Ajax you ll discover your own ways in which it can improve your application. While most of these examples use Java servlets for the server-side component, every example could just as easily have been written using .NET, Ruby, Perl, PHP or any server-side technology. ,

Figure 4-4. The settings on the Publishing options tab determine the default publishing options on the content creation form.

Create the Web Service (Steps 3 5)

When a node is created, the user name of the author and the time it was created is saved. Selecting Display author and date information shows this information underneath the node s title whenever the full-page node is viewed (see Figure 4-5).

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