Re: Newbee - How to create a dynamic menu in a Struts Action?

Matt Raible wrote:

> I'd put it into the request.
>  
> request.setAttribute("repository", repository);
>  
> Note that you'll have to do this every time you want to view the page 
> since the repository will disappear once the page is done loading.  
> You could also put it into the user's session and then it would stay 
> there for duration of their session - however long you have that set to.
>  
> Matt


Matt,

I found a different, maybe less elegant solution to that:

In the Struts-Action I put the stuf f in the application context:

        
session.getServletContext().setAttribute(MenuRepository.MENU_REPOSITORY_KEY, 
repository);

In the Jsp I take it from the application context:

    <%
    pageContext.setAttribute("repository", 
(MenuRepository)application.getAttribute(MenuRepository.MENU_REPOSITORY_KEY));
    %>
At least this works fine but may not be efficient.

What I do not understand: (Just for a better understanding how it works 
behind the scenes)

    <menu:useMenuDisplayer name="CoolMenu4" repository="repository">
   .........
    </menu:useMenuDisplayer>   

Where does it look for the "repository" object? Does it lookup in all 
contexts (Page, Request, Session, Application)?

Cheers

Tom

>     -----Original Message-----
>     *From:* struts-menu-user-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
>     [mailto:struts-menu-user-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org] *On Behalf
>     Of *Thomas Bednarz
>     *Sent:* Friday, June 25, 2004 2:22 AM
>     *To:* Struts menu user list
>     *Subject:* [struts-menu] Newbee - How to create a dynamic menu in
>     a Struts Action?
>
>     Hi,
>
>     I usually work with Velocity and not with JSP. However I decided
>     to build my menu with JSP and mix Velocity and JSP. The problem
>     is, that I have no experience with JSP.
>
>     To create a dynamic menu I looked at the database sample. I have
>     the following question:
>
>     How can I put my menu repository from a Struts Action into a JSP
>     Page Context ?????
>
>     I have a Struts Action that builds the menu as follows:
>
>         public ActionForward perform(ActionMapping mapping, ActionForm
>     form,
>                                      HttpServletRequest request,
>     HttpServletResponse response)
>         throws IOException, ServletException
>         {
>             ActionForward af = super.perform(mapping, form, request,
>     response);
>             if (af != null)
>                 return af;
>             ........
>             buildMenu(session);
>             .....
>             return (new ActionForward("/Templates/Test.jsp"));
>         }
>        
>         protected void buildMenu(HttpSession session)
>         {
>             MenuRepository repository = new MenuRepository();
>             MenuRepository defaultRepository = (MenuRepository)
>            
>     session.getServletContext().getAttribute(MenuRepository.MENU_REPOSITORY_KEY);
>             repository.setDisplayers(defaultRepository.getDisplayers());
>            
>             MenuComponent mc = new MenuComponent();
>             mc.setName("Test Menu 1");
>             String title = "Menu Title";
>             mc.setTitle(title);
>             //mc.setLocation("location");
>             repository.addMenu(mc);
>            
>            // WHERE TO PUT THE REPOSITORY OBJECT (IN WHICH CONTEXT??)
>            // I should do something like
>     JSPPageContext.setAttribute("reporsitory", repository);
>         }
>
>     In the Test.jsp I would like do do something like:
>
>         <menu:useMenuDisplayer name="ListMenu" repository="repository">
>             <menu:displayMenu name="Test_Menu_1"/>
>         </menu:useMenuDisplayer>   
>
>     Many thanks for your help!
>
>     Tom.
>