hello alexander, you have to use the ppr mechanism of trinidad.
you'll find more details at: http://myfaces.apache.org/trinidad/devguide/ppr.html regards, gerhard 2008/1/3, Alexander Pohl <[EMAIL PROTECTED]>: > > Hi all, > > I am quite new to Trinidad and JSF and have the following problem: in a > page I list some entities from a > TrinidadEntityQuery. The page displays a commandlink to let the user > delete one of those entities. The > deletion shall be confirmed by the user by clicking 'Ok' in a popup > dialog. The dialog then passes back > the enity's id to the main page's backup bean which has a return > listener method. All works fine BUT the > main page is not re-rendered after the deletion of the entity, so the > entity still is displayed. In my application > there are other usages of popups to update entites in quite the same way > (main page listing enitity, popup > editing entitiy, main page shows changes after popup has closed), so I > really have no clue why in this > case nothing happens. > > The table and commandling portion of the main page 'enginetypes.xhtml' > looks like this: > > <!-- Table --> > <tr:form> > <tr:table var="engineType" > value="#{engineTypeHome.entityQuery.dataModel}" > rows="#{engineTypeHome.entityQuery.maxResults}" rowBandingInterval="1" > width="100%"> > <f:facet name="header"> > <tr:outputText value="Engine Types"/> > </f:facet> > > <!-- the edit button, redirects to this page > with the currently selected engineTypeId --> > <tr:column inlineStyle="width:4em"> > <f:facet name="header"> > <tr:outputText value="Edit" > styleClass="columnUnsortableHeaderText"/> > </f:facet> > <s:link view="/enginetypes.xhtml"> > <f:param name="engineTypeId" > value="#{engineType.id}"/> > <img src="images/edit.gif" > alt="#{engineType.id}" style="border:0"/> > </s:link> > </tr:column> > > <!-- the delete button, calls the > engineTypeHome's remove method --> > <tr:column inlineStyle="width:4em"> > <f:facet name="header"> > <tr:outputText value="Delete" > styleClass="columnUnsortableHeaderText"/> > </f:facet> > <tr:commandLink > action="dialog:deleteEntity" > immediate="true" > partialSubmit="true" > useWindow="true" > windowWidth="650" > windowHeight="300" > > launchListener="#{engineType.addConfirmDeletionParams}" > > returnListener="#{engineTypeHome.handleConfirmDeletionDialogReturn}"> > <img src="images/delete.gif" > alt="#{engineType.name}" style="border:0"/> > </tr:commandLink> > </tr:column> > > <!-- the first (and only) column displays the > engineType's name --> > <tr:column sortable="true" > sortProperty="upper(engineType.name)"> > <f:facet name="header"> > <tr:outputText value="Name" > styleClass="columnSortableHeaderText"/> > </f:facet> > <tr:outputText value="#{engineType.name}"/> > </tr:column> > </tr:table> > </tr:form> > > This is the code of the backing bean 'EngineTypeHome.java': > > @Name("engineTypeHome") > @Scope(ScopeType.CONVERSATION) > public class EngineTypeHome extends HomeBase<EngineType> { > private TrinidadEntityQuery engineTypesQuery; > > @In > private EntityManager entityManager; > > public EngineTypeHome() { > super("engineTypeId"); > } > > @Factory("selectedEngineType") > public EngineType init() { > return getInstance(); > } > > @Override > public boolean checkRemovable() { > EngineType engineType = getInstance(); > return checkRemovable(engineType); > } > > public boolean checkRemovable(EngineType engineType) { > long usageCount = (Long) entityManager.createQuery("select > count(event) from Event event where event.engineType = :engineType") > .setParameter("engineType", engineType) > .getSingleResult(); > > if(usageCount > 0) { > FacesUtil.error("Cannot delete engine type '" + > engineType.getName() + "'. There are events for this engine type."); > return false; > } > return true; > } > > @Override > public EntityQuery getEntityQuery() { > if (engineTypesQuery == null) { > engineTypesQuery = new TrinidadEntityQuery(); > String ejbql = "select engineType from EngineType engineType"; > engineTypesQuery.setEjbql(ejbql); > engineTypesQuery.setMaxResults(15); > engineTypesQuery.setOrder("engineType.name"); > } > return engineTypesQuery; > } > > @Transactional > public String handleConfirmDeletionDialogReturn(ReturnEvent > returnEvent){ > Long engineTypeId = (Long) returnEvent.getReturnValue(); > if (engineTypeId != null){ > // load the entity from the database > EngineType engineType = entityManager.find(EngineType.class, > engineTypeId); > > // make sure it has been loaded (no locking currently > activated!) > if (engineType == null){ > FacesUtil.error("Cannot delete engine type. It may have > been deleted in the meantime."); > return null; > } > > // actually remove it > if (checkRemovable(engineType)){ > entityManager.joinTransaction(); > entityManager.remove(engineType); > entityManager.flush(); > } > > getEntityQuery().refresh(); > FacesContext.getCurrentInstance().renderResponse(); > } > return "removed"; > } > > /** > * Calls the super save method and refreshes the entity query. > * @return The navigation outcome of HomeBase.save(). > */ > @Override > public String save(){ > String outcome = super.save(); > if (engineTypesQuery != null){ > engineTypesQuery.refresh(); > } > return outcome; > } > } > > The confirmation dialog page 'delete-entity_dlg.xhtml' looks like this: > > <?xml version="1.0" encoding="utf-8"?> > <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" > "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd";> > <html xmlns="http://www.w3.org/1999/xhtml"; > xmlns:ui="http://java.sun.com/jsf/facelets"; > xmlns:f="http://java.sun.com/jsf/core"; > xmlns:s="http://jboss.com/products/seam/taglib"; > xmlns:tr="http://myfaces.apache.org/trinidad"; > xmlns:trh="http://myfaces.apache.org/trinidad/html";> > <head/> > <body> > <ui:composition template="popup_template.xhtml"> > <ui:define name="main-content"> > <script type="text/javascript" xml:space="preserve"> > // <![CDATA[ > _pprUnsupported = false; > // ]]> > </script> > <tr:form defaultCommand="okButton" styleClass="noprint"> > <tr:panelFormLayout> > <tr:outputText inlineStyle="font-size:0.8em" > value="Please confirm the > deletion of the #{deleteEntityBackingBean.userPrompt}"/> > <tr:messages globalOnly="true"/> > <tr:panelButtonBar> > <tr:commandButton id="okButton" > styleClass="okButton" > > action="#{deleteEntityBackingBean.ok}" > > rendered="#{deleteEntityBackingBean.initOk}"/> > <tr:commandButton id="cancelButton" > styleClass="cancelButton" > > action="#{deleteEntityBackingBean.cancel}" > immediate="true"/> > </tr:panelButtonBar> > </tr:panelFormLayout> > </tr:form> > </ui:define> > </ui:composition> > </body> > </html> > > And here is it's backing bean 'DeleteEntityBackingBean.java': > > /** > * Backing bean for the dialog page delete-entity_dlg.xhtml. > */ > @Name("deleteEntityBackingBean") > @Scope(ScopeType.CONVERSATION) > public class DeleteEntityBackingBean { > // the message displayed to the user > private String userPrompt; > > // the entity to be deleted > private Long objectId; > > // if false, an initialization error occurred (missing dialog > parameter) > private boolean initOk = true; > > @Logger("etd.edit") > private Log log; > > @In(create = true) > private EntityManager entityManager; > > public DeleteEntityBackingBean() { > } > > @Create > @Begin > public void create() { > // get the dialog startup parameters > RequestContext requestContext = RequestContext.getCurrentInstance > (); > objectId = (Long) requestContext.getPageFlowScope > ().get("objectId"); > userPrompt = > (String)requestContext.getPageFlowScope().get("userPrompt"); > > if (objectId == null) { > FacesUtil.error("Internal error: no object to be deleted!"); > initOk = false; > } > } > > @Transactional > @End > public String ok() { > // close the dialog returning the id > RequestContext.getCurrentInstance().returnFromDialog(objectId, > null); > } > > @Transactional > @End > public String cancel() { > // close the dialog returning null > RequestContext.getCurrentInstance().returnFromDialog(null, null); > } > > public String getUserPrompt() { > return userPrompt; > } > > public boolean isInitOk() { > return initOk; > } > } > > There is a navigation rule for the dialog in the faces-config.xml: > ... > <navigation-case> > <from-outcome>dialog:deleteEntity</from-outcome> > <to-view-id>/delete-entity_dlg.xhtml</to-view-id> > </navigation-case> > ... > > Any help appreciated, > Alexander Pohl > > > -- > ------------------------ > Alexander Pohl > ------------------------ > Think Applications GbR > Zionskirchstrasse 73 > D-10119 Berlin > ------------------------ > Phone +49 30 4171 4624 > Fax +49 30 4171 4625 > Mobile +49 173 211 2864 > ------------------------ > mailto:[EMAIL PROTECTED] > ------------------------ > > -- http://www.irian.at Your JSF powerhouse - JSF Consulting, Development and Courses in English and German Professional Support for Apache MyFaces
