[Javascript] Client Side anti-cache [was 1 MORE Question...]

[Rodney Myers]

Josiah,

Much appreciated. I like your reasoning about the IE Cache settings.
And the default being "Automatically" is helpful too.

I wonder what the difference is between "Automatically" and "Every visit to the
page".
For example would "Automatically" just check on Tuesdays, unless the moon was
full?

Rodney

I am thus encouraged to pursue my script idea for use in exceptional
circumstances.

Josiah Gordon wrote:

> Rodney,
>
> > I have over 1000 sites using my shopping
> > scripts and I want to give best advice
> > to users with pricing information on their
> > pages that may become out of date
> > while in cache.
>
> I just do not think that you have to worry about it. The default caching in
> all web browsers takes care of this for you. In IE, for instance, you have
> the following options:
>
> Check for newer versions of stored pages:
>
> - Every visit to the page
> - Every time you start Internet Explorer
> - Automatically (default)
> - Never
>
> With three out of four of theses options your user is almost assured to have
> the newest prices when they view your pages. The fourth option forces cache
> use - that means that every time the user goes to a news site they see the
> same news stories from their first visit. My guess is that in reality no one
> really uses that setting outside of web kiosks with static content.
>
> Basically, if you are using static HTML pages I hold that any type of
> scripted client-side cache control is an attempt to reinvent the wheel (the
> caching built into web browsers is already tested and functional).
>
> However, if it would help you rest easier I would recommend something along
> your first thought of "a script that might compare system date to
> document.lastModfied." Give your users a confirm() box that asks if they
> want to reload the page with a decently descriptive explanation of why your
> script thinks they should... Just do not rely on it, because it is easily
> broken by a number of factors.
>
> --Josiah Gordon
>
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Rodney Myers
Based in Oxford, England
Technical Director, Shop at ssistant eCommerce Solutions