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Because all the HTML elements have been associated with an identifier, clicking on a cell of a table generates the identifier in the last row of the table, as illustrated in Figure 6-10 Figure 6-10 shows two balloons highlighted The first balloon with the number 1 shows where a user clicked This user clicked on the first row of the table This generates an onclick event, which is given first to the td element, then to the tr element, then to the table element, and then finally to the div element which implements the onclick and generates the output The generated output is highlighted in the second balloon..

Note I recommend selecting the default installation paths because it makes the setup process much

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Events that are bubbled can be canceled, but there is a caveat in that not all events can be canceled. However, let s put off that caveat for the moment. When an event let s say a click is bubbled, it can be canceled. Canceling an event is appropriate if you don t want a link clicked under certain circumstances. Or another example is an HTML form that should not be submitted after the validation has failed. Consider the following HTML: <div onclick="return MonitorLinks( event)"> <a href="http://www.apress.com" target="external">Apress is not allowed</a> <a href="http://www.google.com" target="external">Google is not allowed</a> <a href="http://www.slashdot.org" target="external">Slashdot is allowed</a> </div> The example shows three links: apress, google, and slashdot. The three links are nested within a div element that has implemented the onclick event. Notice in this example how the implementation of the onclick event prefixes the return keyword before the function MonitorLinks. Using the return keyword is essential in canceling the click event, and in general those events that can be canceled. If an event is captured and processed, the functionality can return true to continue the event bubbling, or false to cancel the event bubbling. The purpose of the function MonitorLinks is to selectively allow a clicked link to navigate to its destination. Logically, the MonitorLinks function will allow navigation to the slashdot link, but not the apress or google links. The implementation of MonitorLinks is illustrated as follows:

When implementing your own REST URL processor, the actual implementation will vary according to the technology used. There is no common theme, but there are two ways to implement a REST URL processor: Find a way to associate a base URL with a specific handler. For example, I tend to use /services as a base for all my Web services. The server needs to support the notion that whenever the requested URL starts with /services, a specific handler is called. The specific handler called is the REST URL processor that then makes the handler call. If you cannot associate a base handler for a base URL, then you need to write an HTTP filter. The difference between an HTTP filter and an HTTP handler is that a filter is called before a handler. The idea of HTTP filters is to enable user code to perform certain common steps on all requests. A common example is authentication. Using an HTTP filter, you have the ability to define which handler is called. In the context of the REST URL processor, the processor would be embedded as a last step after all of the other filters have executed. It is the last step because you want steps such as authentication to execute on the requested URL, and not the redirected execution URL. When implementing your REST URL processor, you must remember that only the URL determines which functionality is called. You must not use an HTTP cookie as part of your decision. As outlined later in this chapter, using HTTP cookies to decide which functionality to execute is very bad design. For the scope of this solution, this is all I ll discuss regarding the REST URL processor.

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