Not having to create getters & setters (or abstract getters in T4) just so
that @Loop (and @For) values and indexes can
become accessible is a fairly often request/question...
Creating a custom binding prefix (perhaps named temp) that attaches objects
to the currect requestcycle
and reads from them looks like an elegant solution - of course, the temp
binding would also need to support
object navigation if it's going to be of any value, so perhaps it could
reuse parts of the prop binding?
On 10/14/07, Howard Lewis Ship <[EMAIL PROTECTED]> wrote:
>
> You can define a variable as a field of your component class.
>
> However, it won't be visible without your providing a getter and setter.
>
> Example:
>
> <t:loop source="database.users" value="user">
> <p>${user.name}</p>
> </t:loop>
>
> Java code:
>
> public class MyPage {
>
> @Inject
> private UserDatabase _database;
>
> private User _user;
>
> public UserDatabase getDatabase() { return _database; }
>
> public void setUser(User user) { _user = user; }
>
> public User getUser() { return _user;
> }
>
> JSPs are based on a pretty ugly concept: code generation, as in it takes
> your JSP and your snippets and generates and compiles a Java class from
> them. Ugly because a stray "{" in your snippet throws a monkey wrench into
> the works. Tapestry gets a big performance advantage over JSPs because of
> how stupied the JSP code generation tends to be.
>
> Anyway, Tapestry parameters are private fields, to be visible outside the
> component's code they must be exposed as properties: read-only or
> read/write
> (or even write-only) by providing the correct accessors.
>
> My comments was that the Loop component has the values you are looking for
> ... but it's not sharing. Add an issue and we'll see about getting that
> into 5.0.6 or 5.0.7.
>
> On 10/14/07, Mohammad Shamsi <[EMAIL PROTECTED]> wrote:
> >
> > hi Howard,
> >
> > i have no experience in Tapestry, i just test it for replacing my
> > company
> > framework.
> > i use for 6 years struts, webworks and my own framework that based on
> both
> > struts and webworks.
> >
> > in pages that made from JSP and JSTL , we can simply define a variable
> in
> > page, this variable bind on specified scope (page, session, ...). I
> guess
> > that if you define a new prefix for inline variables (on space
> variables)
> > ,
> > we can easily use it in components and page templates if need.
> >
> > in a simple implement each page or component can have a map for holding
> > on
> > space variables an values. (Map<String /*variable name*/, Object
> > /*variable
> > values*/> )
> >
> > am i right ? i don't know :(
> >
> > On 10/14/07, Howard Lewis Ship <[EMAIL PROTECTED]> wrote:
> > >
> > > If we made the getIndex() and getValue() methods of Loop public, then
> > you
> > > could:
> > >
> > >
> > > <span t:id="loop" source="1..5">
> > > ${loop.currValue}<br/>
> > > </span>
> > >
> > > But then you must define your loop in your Java class and expose it as
> a
> > > property:
> > >
> > > @Component
> > > private Loop _loop;
> > >
> > > public Loop getLoop() { return _loop; }
> > >
> > >
> > > .... however that won't work currently, because those methods are not
> > > visible. If you add an issue, it's a few second's work to make them
> > > public.
> > >
> > > On 10/14/07, Nick Westgate <[EMAIL PROTECTED]> wrote:
> > > >
> > > > I can see what you mean, though it is quite common to use the index
> > > inside
> > > > the page class too. T5 keeps things simple to cover the most common
> > > cases.
> > > >
> > > > You can create your own components if you don't like the default
> ones.
> > > > It would be interesting to see an alternative if you write one.
> > > >
> > > > Cheers,
> > > > Nick.
> > > >
> > > >
> > > > Mohammad Shamsi wrote:
> > > > > dear Nick,
> > > > >
> > > > > i want index just for iteration, i don't need it in may page
> class,
> > i
> > > > think
> > > > > that its better to define in Loop component class,
> > > > >
> > > > > suppose that i want to use Loop, 5 times in a singe page, then i
> > most
> > > > define
> > > > > 5 index value, and five item object ???
> > > > >
> > > > >
> > > > >
> > > > > On 10/14/07, Nick Westgate <[EMAIL PROTECTED]> wrote:
> > > > >> The value and index have to go somewhere. Why not in your page
> > class?
> > > > >>
> > > > >> Cheers,
> > > > >> Nick.
> > > > >>
> > > > >>
> > > > >> Mohammad Shamsi wrote:
> > > > >>> hi all,
> > > > >>>
> > > > >>> please take a look at my page bellow,
> > > > >>>
> > > > >>> <!-- do i have to define item object in page class ?? i
> > want
> > > > to
> > > > >> use
> > > > >>> it just here in page ??? -->
> > > > >>> <t:loop source="items" value="item" >
> > > > >>>
> > > > >>> <tr>
> > > > >>> <!-- i want to put an index here for each row in
> table
> > > -->
> > > > >>> <td> ??? </td>
> > > > >>> <td>${item.firstName}</td>
> > > > >>> <td>${item.lastName}</td>
> > > > >>> <td>${item.phone}</td>
> > > > >>> </tr>
> > > > >>> </t:loop>
> > > > >>>
> > > > >>> 1 - i just want to use item object here, for iteration, i don't
> > > want
> > > > to
> > > > >>> define it at my page class, can i ?
> > > > >>>
> > > > >>> 2 - i need an index var for each row, but it seems that for use
> > > index
> > > > >>> attribute in loop component, i have to define a property at my
> > page
> > > > >> class
> > > > >>> first, :((
> > > > >>>
> > > > >>
> > ---------------------------------------------------------------------
> > > > >> To unsubscribe, e-mail: [EMAIL PROTECTED]
> > > > >> For additional commands, e-mail: [EMAIL PROTECTED]
> > > > >>
> > > > >>
> > > > >
> > > > >
> > > >
> > > >
> ---------------------------------------------------------------------
> > > > To unsubscribe, e-mail: [EMAIL PROTECTED]
> > > > For additional commands, e-mail: [EMAIL PROTECTED]
> > > >
> > > >
> > >
> > >
> > > --
> > > Howard M. Lewis Ship
> > > Partner and Senior Architect at Feature50
> > >
> > > Creator Apache Tapestry and Apache HiveMind
> > >
> >
> >
> >
> > --
> > sincerely yours
> > M. H. Shamsi
> >
>
>
>
> --
> Howard M. Lewis Ship
> Partner and Senior Architect at Feature50
>
> Creator Apache Tapestry and Apache HiveMind
>
--
Andreas Andreou - [EMAIL PROTECTED] - http://blog.andyhot.gr
Tapestry / Tacos developer
Open Source / JEE Consulting
