[JBoss-user] [JBoss Seam] - Re: @DataBinder and SelectItems Example
Do you really need a lot of converters? The @SelectItems binder does the
conversion from whatever to SelectItem for you. I see you're using the Object
strategy. The strategy works fine if you already have a lot of converters, but
it wasn't my intention that you create additional converters to use
@SelectItems.
Another way that would avoid the extra converter classes would be to write
another binder that takes the selected value from the UISelect{One, Many}
component and did the appropriate lookup from the original @SelectItems
collection.
This has been on my TODO list for a while. Between holidays, weddings, and
work my time just seems to evaporate. I will of course add this to my existing
contribution once finished.
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[JBoss-user] [JBoss Seam] - Re: @DataBinder and SelectItems Example
This is what I am using now. Every Entity in my project has an id named id
that is a Long. So all I have to do is add the interface Idable to the entity.
There is no doubt a better way. With discussions like this we can find an
optimal technique that everyone can easily use with minimal setup.
Looking it up from the original list seems like a good idea.
Comments and or criticism are welcome.
| public interface Idable {
| public Long getId();
| }
|
I modifed some code from other posts and came up with the following. Generic
converter.
| public abstract class LookupConverterT extends Idable implements Converter
| {
| private ClassT entityClass;
| private EntityManager em;
|
| public LookupConverter(ClassT entityClass, EntityManager em) {
| this.entityClass = entityClass;
| this.em = em;
| }
|
| @SuppressWarnings(unchecked)
| public String getAsString(FacesContext facesContext, UIComponent
component, Object obj)
| {
| T t =(T) obj;
| if(t == null || t.getId()==null)
| {
| return ;
| }
| else
| {
| return t.getId().toString();
| }
| }
|
| public Object getAsObject(FacesContext facesContext, UIComponent
component, String str)
| throws ConverterException
| {
| return getObject(str);
| }
|
| private Object getObject(String str)
| {
| try
| {
| return em.find(entityClass, Long.valueOf(str));
| }
| catch (NumberFormatException e)
| {
| throw new ConverterException(new FacesMessage(You must select
something.));
| }
| }
| }
|
I am using inner classes to deliver my converters form a SLSB. I am passing
the EntityManager to the constructor.
| @Stateless
| @Name(converterFactory)
| public class ConverterFactoryBean implements ConverterSizeFactory
| {
| @Logger private Log log;
| @PersistenceContext EntityManager em;
|
| public Converter getSizeConverter()
| {
| return new SizeConverter(em);
| }
|
| public static class SizeConverter extends LookupConverterSize
| {
| public SizeConverter(EntityManager em)
| {
| super(Size.class, em);
| }
| }
| }
|
I have a facelets taglib that creates the select field and renders the message
in a mouseover icon with another custom facelets tag.
| ui:composition xmlns:ui=http://java.sun.com/jsf/facelets;
xmlns=http://www.w3.org/1999/xhtml; xmlns:h=http://java.sun.com/jsf/html;
xmlns:f=http://java.sun.com/jsf/core;
| tr class=tr0
| td#{selectFieldLabel}/td
| td
| h:selectOneMenu id=#{selectFieldId}
|value=#{selectFieldValue}
|class=select_std w200
|converter=#{selectFieldConverter}
| f:selectItems value=#{selectFieldItems} /
| /h:selectOneMenu
| /td
| tdpt:errorsField fieldId=#{selectFieldId} //td
| /tr
| /ui:composition
|
In the page I set it up as follows:
| pt:selectField2 selectFieldId=size
| selectFieldLabel=Size
| selectFieldValue=#{poCoupling.size}
| selectFieldItems=#{sizeSelectItems}
|
selectFieldConverter=#{converterFactory.sizeConverter}/
|
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[JBoss-user] [JBoss Seam] - Re: @DataBinder and SelectItems Example
I teaked it a bit to make it a SFSB and pull a list of objects. For anyone
else that tries this do not put valueMethod=??? if you change the value
stragety to valueStrategy = SelectItems.Strategy.OBJECT.
I thought for sure I needed this, but errors occur after you add the converter.
It kept returning the label value to the converter and chocking in my public
String getAsString(FacesContext ctx, UIComponent component, Object value)
method since I am looking it up by the id in the converter.
I haven't fully tested this out, but so far it really rocks. More people
should post their stuff to the wiki like Jim did.
All I need now is a way to have my entites convert themselves so I do not have
to go to the trouble of making one for every type.
Is anyone close to or have a solution for this?
| @Name(selector)
| @Stateful
| @Scope(ScopeType.EVENT)
| @Interceptors(SeamInterceptor.class)
| public class SelectorAction implements Selector, Serializable
| {
| private static final long serialVersionUID = 1691282596699470676L;
|
| @Logger Log log;
| @PersistenceContext EntityManager em;
|
| private Grade selected;
| public Grade getSelected() { return selected; }
| public void setSelected(Grade selected) { this.selected = selected; }
|
| @SelectItems(valueStrategy = SelectItems.Strategy.OBJECT, labelMethod =
getGrade)
| public List items;
|
| @Factory(items)
| public List getItems()
| {
| items = em.createQuery(from Grade).getResultList();
| return items;
| }
|
| public void select()
| {
| log.info(You selected: + selected.getGrade());
| }
|
| @Remove @Destroy
| public void destroy() { }
| }
|
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[JBoss-user] [JBoss Seam] - Re: @DataBinder and SelectItems Example
One more time. Than you Jim. I cleaned it up even more. I cannot believe how
easy it is to use SelectItems now. Your code is really clear and easy to
follow. I did have it working, but now it is cake.
:-) :+) :~)
| @Name(selector)
| @Stateless
| @Interceptors(SeamInterceptor.class)
| public class SelectorAction implements Selector
| {
| @EJB GradeDAO gradeDAO;
|
| @SelectItems(valueStrategy = SelectItems.Strategy.OBJECT, labelMethod =
getGrade)
| private List gradeSelectItems;
|
| @Factory(gradeSelectItems)
| public List getGradeSelectItems()
| {
| return gradeSelectItems = gradeDAO.getAllGrades();
| }
| }
|
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[JBoss-user] [JBoss Seam] - Re: @DataBinder and SelectItems Example
I'm glad it's useful. If you put the following in your ejb-jar.xml you'll be able to remove the @Interceptors annotation from all of your components. That should clean up the code even more. | ejb-jar |assembly-descriptor | interceptor-binding | ejb-name*/ejb-name | interceptor-classorg.jboss.seam.ejb.SeamInterceptor/interceptor-class | /interceptor-binding |/assembly-descriptor | /ejb-jar | View the original post : http://www.jboss.com/index.html?module=bbop=viewtopicp=3955143#3955143 Reply to the post : http://www.jboss.com/index.html?module=bbop=postingmode=replyp=3955143 Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnkkid=120709bid=263057dat=121642 ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [JBoss Seam] - Re: @DataBinder and SelectItems Example
I was aware there was a way to remove that, but never looked into it. I was able to clean up over 75 SLSB an SFSB. Thx for the tip. What are your thoughts on a slick converter. I am using one that forces me to make my entites implement an interface. Not a big problem, but I am looking for a slick way to avoid that. View the original post : http://www.jboss.com/index.html?module=bbop=viewtopicp=3955154#3955154 Reply to the post : http://www.jboss.com/index.html?module=bbop=postingmode=replyp=3955154 Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnkkid=120709bid=263057dat=121642 ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [JBoss Seam] - Re: @DataBinder and SelectItems Example
Yes. Let me head on over to the wiki and find a place to post it. -Jim View the original post : http://www.jboss.com/index.html?module=bbop=viewtopicp=3954928#3954928 Reply to the post : http://www.jboss.com/index.html?module=bbop=postingmode=replyp=3954928 Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnkkid=120709bid=263057dat=121642 ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [JBoss Seam] - Re: @DataBinder and SelectItems Example
Thanks Captain. I will be looking for it. You really seem to know your shiz. Do you have any suggestion for a solution to the following unrelated problem? http://www.jboss.com/index.html?module=bbop=viewtopict=85986 View the original post : http://www.jboss.com/index.html?module=bbop=viewtopicp=3954930#3954930 Reply to the post : http://www.jboss.com/index.html?module=bbop=postingmode=replyp=3954930 Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnkkid=120709bid=263057dat=121642 ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [JBoss Seam] - Re: @DataBinder and SelectItems Example
The @SelectItems example can be found on the Wiki here. http://wiki.jboss.org/wiki/Wiki.jsp?page=JBossSeam It doesn't currently support selection, you'll need to use JSF EL to bind selected values to your controller. This should help you get your drop down started though. -Jim View the original post : http://www.jboss.com/index.html?module=bbop=viewtopicp=3954933#3954933 Reply to the post : http://www.jboss.com/index.html?module=bbop=postingmode=replyp=3954933 Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnkkid=120709bid=263057dat=121642 ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
[JBoss-user] [JBoss Seam] - Re: @DataBinder and SelectItems Example
Thanks again Jim. I will look into it. Hopefully this type of functionality will be added to Seam sometime soon. Everyone needs dropdowns. :-} And using them should be a trivial matter. View the original post : http://www.jboss.com/index.html?module=bbop=viewtopicp=3954937#3954937 Reply to the post : http://www.jboss.com/index.html?module=bbop=postingmode=replyp=3954937 Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnkkid=120709bid=263057dat=121642 ___ JBoss-user mailing list JBoss-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-user
