Re: Prevalence and Web Applications

On 16.12.2012 04:07, Naveen Chawla wrote:
> This might be a stupid question but why do you need to "update" anything
> on the server-side "continuously" *before* saving the object? Why
> wouldn't you just let the user manipulate the temp data on the client
> side & when they want the persistent object to have it, just send it
> across & make it so? Sorry if this sounds ignorant.

That depends on the framework in use. This is possible when the state is 
kept client side by using a 100% client side framework like GWT or 
programming the UI yourself in JavaScript. Other frameworks like JSF or 
Wicket keep part of the state on the server side when working with Ajax 
or multi page forms. My question concerned itself with the later type of 
framework.

> But if you need whatever they type to be saved while they type it, on
> the server-side, for later retrieval (maybe in case they want to log off
> and come back again after a few days and see it?), just not in the
> "main" data, you'd still put it in the prevalent object, just on a
> "side" variable, with your own custom "commit()" method, for example, to
> transfer it to the "main" bit when they want it there instead.

So basically create a working copy of the object for an edit form? Since 
there are potentially multiple users woking on the same prevalent object 
one (transient) working copy of the values would not be enough.

> If you're talking about simple data UI binding with server-side Java
> objects itself, there are frameworks like Vaadin that offer that if you
> haven't already committed to a platform. Although this is super-elegant,
> it isn't really needed if you already have. I'm not using it (because I
> want client-side flexibility).

AFAIK Vaading also keeps the state on the server side? Although I do not 
know if it updates the objects on Ajax requests like JSF does.

ciao,
elm

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