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The JavaServer Faces Framework
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For example, let s say the application designer wants to automatically update the City and State fields when the user changes the Zip Code field To implement this feature on top of an event/listener framework, the designer needs to understand that the framework publishes a value change event whenever the value of a field changes The designer would then register a listener for this event on the Zip Code field The implementation of the listener would be handed a reference to the Zip Code field, from which it could extract the value and take the action necessary to update the City and State fields The art of programming an event/listener framework is simply a matter of understanding the set of available events, the meaning of each one, and mapping that to the needs of your specific application as a collection of listeners for those events As graphical user interface technologies ranging from the X Window System and the Apple Macintosh to Microsoft Windows began emerging in the late 1980s and early 1990s, they all had one thing in common: an event-based mechanism for dealing with state changes of user interface elements In the years preceding the explosion of the Web, these were the dominant technologies for building software user interfaces As the Web became the dominant platform for application development, rich, event-based user interface development took a step backward Because of the loosely connected nature of the Web where clients communicate asynchronously in a much lighter fashion than the traditional user interface technologies, the familiar event-based model regressed to a more primitive form of basic input and output in which a sequence of name-value pairs (parameters) are submitted to a server and the application code mainly deals with a single GET or POST event Gone was the notion of being able to respond to intricate user interface changes As the Web gained in popularity, client-based technologies such as JavaScript and DHTML were introduced to improve the end-user experience by allowing the client browser the ability to react to more intricate changes in the state of a user interface element However, using JavaScript and DHTML has always been a bit of an art, mainly because of the dual nature of dealing with client events and dealing with server Get/Post events There was also the myriad of challenges inherent in getting the application to run in different Web browsers
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NOTE Clever use of JavaScript and DHTML in the form of asynchronous calls to the server to pass
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data back and forth independent of page delivery is becoming popular; it is known as Asynchronous JavaScript and XML (Ajax) Examples of how to use Ajax in custom JavaServer Faces components are provided in 12
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As mentioned at the start of this chapter, JavaServer Faces distinguishes itself among the different Web technologies by providing an event model that supports a rich, event-based user interface programming style that is similar to that used when developing for AWT or Swing Using the JSF event model, which is part of the overall JSF request processing lifecycle, you no longer need to be concerned with processing large sets of name/value pairs provided in HTTP Get and Post requests Instead, you can program to a more traditional event model where user interface elements broadcast changes in state (events) to a respective set of listener objects that then perform the tasks required
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Some Event Examples
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There are two broad categories of events in JSF, application events and lifecycle events These will be explained completely later in the chapter, but some quick examples will greatly aid in understanding the big picture
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The JSF Event Model
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First, let us examine an example of an application event by revisiting the master-detail example from 5 This example allowed the user to select a service level to view from a drop-down list and then see the subscribers at that service level In the earlier version of this example, we used the flash to convey the value of the selected service level to show in the detail view Here, we will listen for the ValueChangeEvent and take the appropriate action to update the model Here is the new markup for the masterxhtml page
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<h:form> <h1>Master</h1> <p><h:selectOneMenu valueChangeListener="#{modelmenuValueChanged}" value="#{modelserviceLevel}"> <f:selectItems value="#{modelkeys}"/> </h:selectOneMenu> <h:commandButton value="Show Subscribers" /></p> </h:form> <h1>Detail</h1> <p>#{flashvalueChangeMessage}</p> <h:dataTable border="1" var="user" value="#{modeldata[modelserviceLevel]}"> <h:column> <f:facet name="header">First Name</f:facet> #{userfirstName} </h:column> The rest of the rows are not shown because they are the same as in chapter 5 </h:dataTable>
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