Jason Kary wrote:
>
> I have a basic question.
>
> Is a template = screen?
>
> JK
No.
A template is a lot of html/xml with some simple (hopefully) programming
constructs thrown in. Types of templates that are supported to one
degree or another are Velocity,WebMacro,JSP,FreeMarker.
In turbine there are layout, navigation, screen templates. A response
will be constructed using a layout template which will contain
placeholders where the results of navigation templates and a screen
template will go. (If one does not want to use Turbine's
layout/navigation/screen page model, it can be set up to use only
templates that would be considered type screen.)
There are java classes backing the types of templates. The base classes
that these would derive from are Layout, Navigation, and Screen. These
classes can be used separate from a template system, but when used with
a template system their primary use is to stuff objects into a context
for use in the template; they might also enforce some security
policies. It is possible as the template support evolves that the need
for these classes may be removed.
I think one source of confusion is the difference between the "screen"
and "template" keywords when used in links. The "screen" keyword
references a Screen (java class). This is almost never necessary when
using a template system, but could be used for example if the response
will be binary. So a link to a tarball download which is to fall within
Turbine's security/session management would probably use the screen
keyword.
The template keyword refers to a "template screen", the template that
contains the primary content for the response (as opposed to a template
navigation). The java classes associated with the template will be
assigned according to the directory and package structures of the
application.
So to summarize:
As far as the url parameters go
screen = java Screen class
template = template screen file
Questions:
Should we fix the keyword ambiguity?
If yes, what would be a good keyword and who wants to fix it?
I could of course try to make it as clear as possible in the docs, but I
still think it is just a little confusing that the template and Screen
are both screen parts of a page, but the java class gets the keyword
screen.
John McNally
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