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Of course, hard-coding navigation rules isn t the most robust solution. After all, the flow of a web application often depends on more than just what button or link was pressed; it typically is based on what a user entered on the page. JSF easily meets this need by allowing you to associate a method with a user action. Let s modify our Echo.jsp example a bit to demonstrate what this might look like. For starters, we ll add a new method to our User class. If the user enters the name Nate, we will head to our familiar Hello page, but if they don t, we ll send them someplace else. Let s start by adding the code from Listing 8-6 to the User class. We now need to make a call to this method from our button, so we ll replace the hard-coded action of hello with action="#{user.isNate}". This is a method expression we are telling JSF to fire the isNate method on the user bean when this button is selected. Keep in mind that in this instance, the method expression doesn t take parameters and return a String value. (The actual signature is enforced by the JSF component. Some methods may take a parameter and return void, for instance.) The JSF navigation handler uses the returned String in conjunction with the navigation rules to determine the flow of the application. Finally, we need to add the configuration from Listing 8-7 to your faces-config.xml file so that JSF knows what page each outcome maps to.

So if you ve got no other options . . . yes, it s OK to sniff. But you ve got to do it right. Perform the following steps or else suffer the wrath of the browser gods.

Another attribute is data, which allows you to get any additional data from the server during an Ajax request. The data attribute can simply point to a bean property via EL, and the data will be serialized in JSON format and available on the client side. Here s an example:

First, assuage your guilt. Find a friend or coworker across the hall, on Instant Messenger, in IRC and summarize your dilemma. Often your consultant will suggest an approach you hadn t thought of. But if he can t think of a better way, you ll feel more secure in your decision.

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public String isNate() { String result = "notNate"; if (name.equalsIgnoreCase("Nate")) { result = "nate"; } return result; }

Write a comment that explains the problem and why you ve got to sniff. Put it as close as possible to the offending line of code. Be verbose. This is for your own benefit: six months from now you won t remember why you wrote that code the way you did, so think of it as a message to Future You.

<navigation-rule> <from-view-id>/Echo3.jsp</from-view-id> <navigation-case> <from-outcome>nate</from-outcome> <to-view-id>/HelloJSF.jsp</to-view-id> </navigation-case> <navigation-case> <from-outcome>notNate</from-outcome> <to-view-id>/NotNate.jsp</to-view-id> </navigation-case> </navigation-rule> Now, when we enter something other than Nate (like Ryan ), we see something like Figure 8-4.

<a4j:commandButton value="Submit" reRender="out" data="#{bean.text}" oncomplete="alert(data)"/> where text is as follows: private String text = "Nice, I can get any data from the server"; When the button is clicked, the following alert will appear:

Most importantly, write code without unnecessary kinks and contortions. If Internet Explorer needs one thing, but all other browsers need another, write your function to handle the other browsers. If one approach uses the DOM standard and the other uses a proprietary Internet Explorer method, write your function to use the DOM standard then, at the beginning of the function, send Internet Explorer into a different function to handle the weird case.

The purpose is to avoid the black holes that come from excessive sniffing. Consider this code:

As you can see, creating JSF applications involves utilizing the two tag libraries: core and HTML. So far, we ve touched on only a few of them. In practice, there are more than 40 that provide for a variety of needs. In general, the core tags are simply helpers to the HTML, and they include actionListener attribute convertDateTime converter

function handleFoo() { if (navigator.userAgent.match(/Gecko\//)) return handleFoo_Firefox(); if (navigator.userAgent.match(/MSIE/)) return handleFoo_MSIE(); }

Besides using primitive types, it s also possible to serialize complex types into JSON format including arrays and collections. The beans should be serializable to be referred to by data.

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