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TABLE 5-6
Implicit Objects Available via EL
Part I:
The JavaServer Faces Framework
All of the properties in Table 5-6 that are of type Map can be accessed using the #{MapObject[ key ]} expression form For example, to display a request parameter, userid, in a JSF page, you can use
<h:outputText value="#{param['userid']}" />
<h:outputText value="#{paramuserid}" />
Also, when using Facelets, it is valid to nest expressions so that an expression can be used to look up values in a map, as in
<h:outputText value="#{param[cookiecurrentUser]}" />
The EL Flash E XPERT GROUP I NSIGHT The name flash and the concept behind it are taken directly from
Ruby on Rails Even though more people know flash as a display technology from Adobe Systems Incorporated, David Heinemeier Hansson, the creator of Rails, chose the term flash for its usage as in flash memory In this sense, flash is short-term storage Specifically, anything you put into the flash on one request will be available from the flash on the next request from the same browser window This is true whether the next request is a JSF postback, a redirect, or even a simple HTTP GET for a new page To make the concept clear, let s take the canonical example of master-detail The master-detail pattern shows a master object and a single detail object that gives more information about the currently selected master object The following example uses the set of available service levels (basic, medium, premium) in the virtual trainer as the master object, and the list of subscribers to each service level as the detail objects This example only needs one Facelets page: masterxhtml, shown here:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Transitional//EN" "http://wwww3org/TR/xhtml1/DTD/xhtml1-transitionaldtd"> <html xmlns="http://wwww3org/1999/xhtml" xmlns:h="http://javasuncom/jsf/html" xmlns:f="http://javasuncom/jsf/core"> <h:head> <title>A Simple JavaServer Faces 20 View</title> </h:head> <h:body> <h:form> <h1>Master</h1> <p><h:selectOneMenu value="#{flashserviceLevel}"> <f:selectItems value="#{modelkeys}"/> </h:selectOneMenu> <h:commandButton value="Show Subscribers" /></p> </h:form>
5:
Managed Beans and the JSF Expression Language
<h:panelGroup rendered="#{! empty flashserviceLevel}"> <h1>Detail</h1> <p>Users with Service Level: "#{flashserviceLevel}":</p> <h:dataTable border="1" var="user" value="#{modeldata[flashserviceLevel]}"> <h:column> <f:facet name="header">First Name</f:facet> #{userfirstName} </h:column> <h:column> <f:facet name="header">Last Name</f:facet> #{userlastName} </h:column> <h:column> <f:facet name="header">Sex</f:facet> #{usersex} </h:column> </h:dataTable> </h:panelGroup> </h:body> </html>
PARTIII PART PART
The page has two regions, the <h:form>, which is the master section of the page, and the <h:panelGroup>, which is the detail section of the page The master section has an <h:selectOneMenu>, which shows the available service levels and allows the user to choose one, and an <h:commandButton>, which submits the form Naturally, the page could be enhanced to auto-submit the form when a selection is made from the list The chosen service level and the available service levels are given by EL expressions:
<h:selectOneMenu value="#{flashserviceLevel}"> <f:selectItems value="#{modelkeys}"/> </h:selectOneMenu>
The use of #{flashserviceLevel} as the value attribute for the h:selectOneMenu tag says that the chosen service level is stored into the flash under the key serviceLevel The use of #{modelkeys} as the value attribute for the f:selectItems tag says that the menu should allow the user to choose one value from the Collection returned from the keys property of the managed bean named model Down in the detail section of the page, the h:panelGroup tag has a rendered attribute with the value #{! empty flashserviceLevel} This funny expression uses the ! (not) and empty operators to cause the detail section to only display when the user has selected a service level Also, the selected service level is echoed out with the simple expression #{flashserviceLevel} and is used as the key to the Map returned by modeldata, as shown in the value attribute of h:dataTable The entries in the Map are instances of List<UserData>, which is easily displayed by h:dataTable The managed bean named model is shown following:
package comjsfcompref; import javautilArrayList; import javautilHashMap;
Part I:
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