Thank you very much Dustin, Paul and Richard for your detailed explanation and for your valued time. I will try this.
Thanks /Bandula From: Dustin Pearce [mailto:[EMAIL PROTECTED] Sent: Monday, June 02, 2008 8:57 PM To: users@appfuse.dev.java.net Subject: Re: [appfuse-user] Drop-Down List That approach is fine if you are working with a single page and a single drop-down, but when you need to share a drop-down definition several times it starts crumble a bit. What usually do for all of my applications is I first add a DataDictionary POJO with the purpose of creating all the lists I need to use in the application. I will get to the code, but I need to take a tangent first.... So a DataDictionary has a Set<String> values. So I create a DataDictionary named "Status" and I add the String status values to its values Set. Notice that the values have no key, so the String gets saved for the drop-down field. I went to this model more and more recently as I found 99% of the time, option values were not changing and when they did, a simple String replace was just fine since it was usually a big decision to change it. The upside is that I have the actual value in my record for queries and reports and don't have to constantly "lookup" the text for Status #1. All this being said, I have a couple implementations where instead of Set<String> values I have used <Set>DataDictionaryItem values and the item POJO has optValue and optKey properties.... To the code (Some code/syntax paired for brevity) ****DataDictionary.java******** @Entity @Table(name = "datadictionary") public class DataDictionary{ @Id @GeneratedValue private Long id; private int version; private String name; @CollectionOfElements(fetch = FetchType.EAGER) @JoinTable(name = "datadictionary_values", joinColumns = @JoinColumn(name = "datadictionary_id")) @Column(name = "value") @IndexColumn(name = "position") private List<String> values; Note, the position @IndexColumn. If you wish you could just as well add an @OrderBy instead but realize that will then sort all your lists alphabetically. I traded the flexibility of being able to order my lists however I want for having to manually alphabetize if I that is what I want. ****sample-data.xml**** <table name="datadictionary"> <column>id</column> <column>version</column> <column>name</column> <row> <value description="id">1</value> <value description="version">0</value> <value description="name">Status</value> </row> </table> <table name="datadictionary_values"> <column>datadictionary_id</column> <column>value</column> <column>position</column> <!--Status--> <row> <value>1</value> <value>Pending</value> <value>0</value> </row> <row> <value>1</value> <value>Open</value> <value>1</value> </row> <row> <value>1</value> <value>Closed</value> <value>2</value> </row> </table> I just use xml and dbunit to define and load my keyword lists into the database. A UI would be nice, but I found in the real world its just once or twice and then never again. ****ApplicationContext,xml** <!--DataDictionaryManager-START--> <bean id="dataDictionaryManager" class="com.jmh.foundation.service.impl.GenericManagerImpl"> <constructor-arg> <bean class="com.jmh.foundation.dao.hibernate.GenericDaoHibernate"> <constructor-arg value="com.jmh.foundation.model.DataDictionary"/> <property name="sessionFactory" ref="sessionFactory"/> </bean> </constructor-arg> </bean> Create a GenericMananger/Dao for DataDictionary to look them up when we startup the application. **MyAppStartupListener.java** public class MyAppStartupListener extends StartupListener implements ServletContextListener { private static Log log = LogFactory.getLog(MyAppStartupListener.class); public void contextInitialized(ServletContextEvent event) { super.contextInitialized(event); log.debug("initializing Myapp context..."); ServletContext context = event.getServletContext(); setupJmicContext(context); } public static void setupJmicContext(ServletContext servletContext) { ApplicationContext ctx = WebApplicationContextUtils.getRequiredWebApplicationContext(servletContext); GenericManager gmgr = (GenericManager) ctx.getBean("dataDictionaryManager"); List<DataDictionary> dictionaries = gmgr.getAll(); Set<DataDictionary> uniqueDictionaries = new HashSet<DataDictionary>(dictionaries); for (DataDictionary dic : uniqueDictionaries) { log.debug("Loading dictionary values for :" + dic.getName()); servletContext.setAttribute(dic.getName(), dic.getValues()); } } } Extends the Appfuse startup listener and loads all of the defined DataDictionaries into the ServletContext. This will let us access the lists using the <s:select list="#attr.Status".../> later. The super(...) calls makes sure that Appfuse gets initialized properly before your app does its thing. ***web.xml** <listener> <listener-class>com.jmh.hcc.webapp.listener.MyAppStartupListener</listener-c lass> </listener> Swap your StartupListener in for the Appfuse listener. ***form.jsp*** <s:select list="#attr.Status" emptyOption="true" ...../> That is when your dictionary values are a regular Set<String>. If you went for the full value/key DataDictionaryItem child object then ...... <s:select list=#attr.Status" listValue="optValue" listKey="optKey" ..../> Remember the property names of our child object way back at the top? ...... The #attr.[nameoflist] uses the name of the dictionary object you defined in the xml. Now you can create as many lists as you want and share them anywhere in the application. They are all loaded into memory for great performance. So now we just need some people to post the dbunit xml for inserting a list of state, country, etc Strings....... -D On Jun 1, 2008, at 3:16 PM, Paul Were wrote: Bandula, To be consistent. It is better practice to make your view layer interact with the action support controller struts MVC framework. If this is the case the your taskForm.jsp should be tied to TaskAction.java which should be your action class. In you Action class declare private List availableStatuses; private static final PENDING = "PENDING"; private static final OPEN = "OPEN"; private static final DONE = "DONE"; private static final HOLD = "HOLD"; Then have a method in your action class. public List getAvailableStatuses(){ if(availableStatuses != null){ return availableStatuses; } else { availableStatuses= new ArrayList(); availableStatuses.add(PENDING); availableStatuses.add(OPEN); availableStatuses.add(DONE); availableStatuses.add(HOLD); return availableStatuses; } } In your taskForm.jsp you add <s:select label="Available Status" name="StatusPojo.status" headerKey="1" headerValue="-- Please Select --" list="availableStatuses" /> Make the appropriate declarations in your struts config and applicationContext to hook you action, pojo and jsp. Hope this helps. Paul Were. "Richard Mixon (CustCo)" <[EMAIL PROTECTED]> wrote: I'm pretty new to Struts2 myself, but all of my Appfuse Struts2 pages use a select tag something like this: <s:select name="storyText.status.id" list="activeStatusList" listKey="id" listValue="name" key="storyText.status"/> I think your tag looks more like a Struts(1) tag. Here is the Struts2 reference page for the select tag: http://struts.apache.org/2.0.11.1/docs/select.html Hope this helps. _____ From: Bandula Rathnasekara <[EMAIL PROTECTED]> Reply-To: <users@appfuse.dev.java.net> Date: Sun, 1 Jun 2008 12:36:01 +0530 To: <[EMAIL PROTECTED]> Cc: <users@appfuse.dev.java.net> Subject: [appfuse-user] Drop-Down List Hi all, I want to add simple drop down list in a JSP page with my Struts2 web application on AppFuse framework. I went through related post in web and tried to do it with StartupListener class. I created/modified following classes/jsp. 1. Created Statuses POJO. Not used for the time being 2. Constant public static final String AVAILABLE_STATUSES = "availableStatuses"; 3. StartupListner context.setAttribute(Constants.AVAILABLE_STATUSES , mgr.getObjects(TaskStatuses.class)); 4. LookupManager public List<LabelValue> getObjects(Class<TaskStatuses> name); 5. LookupManagerImpl public List<LabelValue> getObjects(Class<TaskStatuses> name) { List<LabelValue> list = new ArrayList<LabelValue>(); list.add(new LabelValue("PENDING", "PENDING")); list.add(new LabelValue("OPEN", "OPEN")); list.add(new LabelValue("DONE", "DONE")); list.add(new LabelValue("HOLD", "HOLD")); return list; } 6. taskForm.jsp <html:select property="status"> <html:options collection="availableStatuses" property="status" labelProperty="name"/> </html:select> I was struggling with this whole yesterday and I could not populate drop down-list in my jsp. I don't even get error in JSP page. Is it do something with tag libraries in? Any configuration XML file? Can you tell me where else I need to change/correct. If anyone has sample code on this or a place where I can find them pls let me know. Thanks &Regards, Bandula
