[jboss-user] [JBoss Seam] - New to seam: How to choose proper context and achieve extern

mmakundi do-not-reply at jboss.com
Wed Jul 4 02:33:23 EDT 2007


Here is what I am trying to do:
1. I need a page that loads its dataTable contents from db fresh every time I access the page.
2. The items in the dataTable need to be clickable and bookmarkable in the future; this is why s:link was chosen. According to my experience, @Scope(PAGE) does not cut it with <s:link> elements, as the parameters are passed on as null.
3. My business items allow clicking a link, but instead of directly linking the user to the external url I want to record the click-count first. So intuitively I thought I could just return the url from the click-counting action.

The solutions I have tried are the following:
1. Page scope seems to have the right idea: the dataTable contents are refreshed from db each time the page is refreshed. However, page context seem to have problems with requirement 2 -- or am I doing something else wrong?
2. If I use Session scope, the <s:link> works fine and passes the actual objects as parameters to the desired method recordLinkClickAndRedirect(). However, with Session scope the dataTable does not get fresh data in a new page-refresh, because the session is still alive. I can actually make this happen by binding the @Destroy and @Remove annotations to my recordLinkClickAndRedirect() method, but it seams like a hack and I would rather not do that if there is a better way.
3. I have not found a way to redirect from within my recordLinkClickAndRedirect() method, but intuitively it seems like there should be a way as this is how navigation can normally be affected.

Here are my code snipplets:

::: from items.xhtml

	<!-- content -->
	<ui:define name="content">

		<h1>Latest business items</h1>

		<h:outputText value="No items found on this round. Please refresh page to check again!"
			rendered="#{businessItems == null or businessItems.rowCount==0}" />
		<h:dataTable var="businessItem" value="#{businessItems}"
				<s:link value="#{businessItem.externalLinkURL}"
					action="#{itemViewer.recordLinkClickAndRedirect(businessItem)}" />


::: from ItemViewer.java

public class ItemViewer implements LocalInterface {
  private EntityManager entityManager;

  private List businessItems;

   * This method TODO
  public void getFreshBusinessItems() {
    businessItems = (List) entityManager
        .createQuery("select b from businessItem b");

   * This method records that the link has been clicked and redirects the
   * browser to the specific link.
   * @param businessItem
   * @return
  public String recordLinkClickAndRedirect(BusinessItem businessItem) {
    return businessItem.getExternalLinkURL();

   * This method is required by some scopes, e.g., Session scope.
//  @Destroy
//  @Remove
  public void destroyAndRemove() {
    // n.a.

View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4060241#4060241

Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4060241

More information about the jboss-user mailing list