Retrieving Values
Retrieving Values
This tag gets the name of the customer from the session scope and inserts it into the
parameterized message at the key ThankYouParam from the resource bundle. For example, if the
name of the customer is Gwen Canigetit, this tag will render:
Thank you, Gwen Canigetit, for purchasing your books from us.
The name tag on the bookcashier.jsp page has the NameChanged listener implementation
registered on it. This listener saves the customer's name in the session scope when the
bookcashier.jsp
page is submitted. See
for more information on how this listener works. See
to learn how the listener is registered on the tag.
Retrieving values from other implicit objects is done in a similar way to the example shown in
this section.
lists the implicit objects that a value attribute can refer to. All of the
implicit objects except for the scope objects are read-only and therefore should not be used as a
value for a UIInput component.
TABLE 119
Implicit Objects
Implicit Object
What It Is
applicationScope
A Map of the application scope attribute values, keyed by attribute name
cookie
A Map of the cookie values for the current request, keyed by cookie name
facesContext
The FacesContext instance for the current request
header
A Map of HTTP header values for the current request, keyed by header name
headerValues
A Map of String arrays containing all the header values for HTTP headers in the
current request, keyed by header name
initParam
A Map of the context initialization parameters for this web application
param
A Map of the request parameters for this request, keyed by parameter name
paramValues
A Map of String arrays containing all the parameter values for request parameters in
the current request, keyed by parameter name
requestScope
A Map of the request attributes for this request, keyed by attribute name
sessionScope
A Map of the session attributes for this request, keyed by attribute name
view
The root UIComponent in the current component tree stored in the FacesRequest for
this request
Binding Component Values and Instances to External Data Sources
Chapter 11 · Using JavaServer Faces Technology in JSP Pages
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