I know what you mean with your comment about my program flow.
I was just testing my shopping cart script and began thinking about
these issues, which would be minimized by placing proper links to
conduct all these actions.
I just asked myself whether I was missing or ignoring something basic
or obvious...
Thanks!
Luis
On Mar 5, 7:25 pm, "Yoan Blanc" <[EMAIL PROTECTED]> wrote:
> It's a browser and caching issue, web.py has nothing to do with that.
> Here some hints unsing onbeforeunload:
>
> "Just having an unbeforeunload event handler -- regardless of whether
> or not it actually does anything, regardless of whether or not you
> spawn a dialog box or not, even if the entire function declaration
> consists entirely of just { } -- just defining an event handler will
> prevent the page from being cached -- ever.
>
> As a matter of fact, even if you allow page caching, the page will
> be not be cached. Having an onbeforeunload event means the page will
> be re-built every single time it is accessed. Javascripts will re-run,
> server-side scripts will be re-run, the page will be built as if the
> user was hitting it for the very first time, even if the user got to
> the page just by hitting the back or forward button."
> --http://ajaxian.com/archives/newsvine-live-evergreen-is-forever
>
> You still might have issues with Opera which has a cache of the DOM
> itself, and that's more agressive ;-)
>
> Anyway, by clicking the backbutton, the user expects to go to the
> previous step. There is maybe something wrong with your application
> flow.
>
> Cheers,
>
> -- Yoan
>
> On Wed, Mar 5, 2008 at 7:39 PM, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
>
> > I apologize in advance for this question, which is not exactly related
> > to webpy but about how browsers work, I guess...
>
> > I wrote a simple shopping cart, with which I can add and remove
> > products or reset the order.
> > Every time I perform one of these actions, the script shows the
> > current state of the order in a table.
> > The contents of the order are stored in a session variable, which is
> > an instance of the cart.
>
> > The problem is that every time I hit the back button, it shows the
> > previous state of the order, not the current.
> > Is there any way to avoid this? I mean, is there any way that, no
> > matter what I do, the table shows always the current state of the
> > order and not a previous snapshot?
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