Personally ... I think even broader ideas like Dojo Offline (http://
dojotoolkit.org/offline) and Google Gears (http://gears.google.com/)
takes it to an even further level which has not been tapped (yet).
Now if only you can sneak it into a project ;-)
- Jon
On Sep 4, 2007, at 8:50 AM, Kenneth Downs wrote:
One thing that seems to have gone unsaid in the praise for Ajax is
its ability to radically transform how we maintain state.
The web server session is our basic mechanism for storing
information between requests. But it gets clumsier and clumsier to
try to maintain complex state across many page requests when you
use a session. Ingenious minds have put their will to the problem
and come up with workable systems, but all of them are complicated
because of the nature of the problem.
That problem, stated here, is simply the problem of tracking what
I'll call the "context" of a user's session. Some elements of a
session are fixed: the user id, the password, a few other things,
but almost everything that we need to track is always changing. A
basic example: a list of search results. Where do you store it?
When the user hits, "NEXT PAGE", how do you know what to do? If
you are using a session, what happens if he opens a new window and
has two search results sets up for two different tables?
Ajax solves this problem neatly by letting you move all state [1]
into the browser. This makes sense from an architectural viewpoint
because we are putting this context information close to where it
is needed, the UI.
I've been converting the basic Andromeda UI code over to a
completely AJAX system [1], and have found my code radically
simplified and far smoother, due almost entirely to the moving of
all state information to the browser. Hurray for Ajax!
[1] Here I'll use "state" to mean the changing context of user
requests, and assume we are still using the session for User_id and
password.
[2] Andromeda is used to make database applications for businesses,
we don't care in this case about google following our links.
--
Kenneth Downs
Secure Data Software, Inc.
www.secdat.com www.andromeda-project.org
631-689-7200 Fax: 631-689-0527
cell: 631-379-0010
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