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I Note DOM is short for document object model, and it s a hierarchy tree of controls within any given web page. Navigating the DOM permits some rather sophisticated client-side modifications to be performed in your applications, and jQuery certainly makes elements conveniently accessible.

The first choice to make when looking at the three methods described previously is between createXXX() and addXXX()/addConfiguredXXX(). If the nested element s object has a constructor that takes more than one argument or an argument that isn t a Project object, then you must use createXXX(). If, however, it has no arguments or takes a single Project object as an argument, you should use one of addXXX() or addConfiguredXXX(). If you simply want to set defaults for a nested element s attributes, use addXXX(). Ant will override those that the user has set, and you don t have to worry about spoiling a user s settings. If you want to check and verify attribute values, use addConfiguredXXX(). You can then override or correct input. For example, you could strip out any whitespace if it was going to interfere with the task s workings.

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The library supports a variety of selectors; you can find elements by position in the page, ID, class, and so on. We ll look at creative ways to use jQuery to enhance our public-facing user experience later.

Note I am favoring properties-style configuration because it is easy to follow. When you start using advanced log4j components, you will use XML-style configuration files as some of the advanced log4j components can be configured only via XML-style configuration files.

You have seen the details of a task s life cycle, so now you can write some more useful custom tasks than the instructional code in the rest of the chapter. You ll start by creating a task that displays usage information for the project. In other words, this task will mimic the -projecthelp Ant command-line option in a build file. You ll then use it as the default target of the build file so that the user knows which tasks do what when they run Ant with no target set. The other example task is an extension of the <javadoc> task. If you recall 6, the main drawback of the <javadoc> task was the lack of a check to see whether the source files were newer than a destination file. This meant you had to use <uptodate> tasks to determine whether it was worth running a <javadoc> task. You ll now re-create the check-docs target from 6 as a custom task.

I Tip Always consider the concept of graceful degradation when designing web applications where JavaScript is involved. Graceful degradation means that users with the most advanced or capable browsers can and should be presented with a pleasant and enhanced user experience, but users without such capabilities should be in any way restricted from using the site to its fullest. Basically, the bells and whistles can fall by the wayside so long as your app is functional. A user with JavaScript disabled is not going to find your accordion-style jQuery-animated navigation bar all that useful if it doesn t function with JavaScript disabled.

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