Re: Using a managed property Map in JSF to show a status in a SelectOneMenu and OutputText

From:
Lew <lew@lewscanon.com>
Newsgroups:
comp.lang.java.programmer
Date:
Fri, 18 Jan 2008 10:42:06 -0500
Message-ID:
<zKWdnYREz9VSVQ3anZ2dnUVZ_t-nnZ2d@comcast.com>
andymconline wrote:

Hello,

I'm hoping someone can help me. I am trying to use a map-entry to
store and display the status of an entity in the database. I have the
following managed-bean defined in my faces-config.xml file:

<managed-bean>
  <managed-bean-name>RPHandler</managed-bean-name>
  <managed-bean-class>com.sett.backing.RPHandler</managed-bean-class>
  <managed-bean-scope>session</managed-bean-scope>
  <managed-property>
    <property-name>ratePlan</property-name>
    <value>#{ratePlanBean}</value>
  </managed-property>
  <managed-property>
    <property-name>statusMap</property-name>
    <property-class>java.util.HashMap</property-class>
    <map-entries>
      <map-entry>
        <key>In Development</key>
        <value>D</value>
      </map-entry>
      <map-entry>
        <key>Active</key>
        <value>A</value>
      </map-entry>
      <map-entry>
        <key>Not For Sale</key>
        <value>N</value>
      </map-entry>
    </map-entries>
  </managed-property>
</managed-bean>

In my ratePlanForm.jsp file I have the following code to display a
SELECT box:

<h:selectOneMenu id="status" value="#{RPHandler.ratePlan.status}">
  <f:selectItems value="#{RPHandler.statusMap}" />
<h:selectOneMenu>

Which creates the following HTML output:

<select id="status"><option value="D>In Development</option><option
value="A">Active</option><option value="N">Not For Sale</option></
select>

This is exactly what I want, however when I then try and show a list
of ratePlans and their associated status's I use:

<h:outputText value="#{RPHandler.statusMap[ratePlan.status]}" />

Which obviously shows nothing as ratePlan.status is set to the value
from the SELECT box ("A" for example) and their is no key equal to A
in the HashMap (as I have had to declare the HashMap with the
descriptions in the key field so that the selectItems JSF tag displays
the descriptions in the SELECT box). How to I get the outputText to
show the textual description of A? Do I need to declare two hashmaps [sic]?


Nah, you need a List of a custom type that holds the attributes of interest
(name, for example). Return the entire CustomType object as the value, or
keep a Map of the CustomType objects on the server only, indexed by the
returned letter (Map <String, CustomType>). Then you display the returned
object's "name" attribute (or whatever you call it) wherever you need to.

By convention, attribute and variable names begin with a lower-case letter
('rpHandler').

--
Lew

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