Dole wrote:
[color=blue]
> We have a problem with caching of js Files in our application.
>
> The situation is that in some location our application is not running
> well - the problem we identified was that not the actual js is used in
> these problem locations.
>
> We are using jsp and external javascript files. We have configured our
> webserver to insert into the http header cach-control and pragma -
> both parameters with no header.
> My problem is now that in we identified that the changes we made in
> the javascript are not directly displayed and used in the application.
> Also when the user is deleting the cache in the browser the wrong
> javascript is use to display the page.
> We also tried to download the js file directly from our webserver and
> then the correct js file was donwloaded.
>
> So my assumption is that either the proxies of our customer are not
> able to understand the http header we insert into our information we
> sent to them or our webserver is not well configured and we are not
> forcing the application to update existing js files in the customer's
> proxies.
>
> Does anybody has any idea what we should test? Or which parameters can
> help us to solve the problem with the not loaded js files?
>
> Thanks for help
>
> Dole[/color]
To ensure the browser requests a new copy of your external client-side
JavaScript files when they change, use a versioning system on the URL.
Something like:
<script type="text/javascript"
src="ourClientSideJS.js?v=200307111200"></script>
When you change the file at 9am on August 17, 2003, you'd change this to:
<script type="text/javascript"
src="ourClientSideJS.js?v=200308170900"></script>
When the browser sees this new URL, it will determine is has not cached a
copy of it and download a fresh copy from the server.
If you need to use the same client-side file in multiple places, rather
then change the value of "v" everywhere, put the <script ...></script> tag
in a server-side include and #include it on every page you use it on, then
you only need change the value of "v" in one place when the contents of
ourClientSideJS.js changes.
--
| Grant Wagner <gwagner@agricoreunited.com>
* Client-side Javascript and Netscape 4 DOM Reference available at:
*
http://devedge.netscape.com/library/...ce/frames.html
* Internet Explorer DOM Reference available at:
*
http://msdn.microsoft.com/workshop/a...ence_entry.asp
* Netscape 6/7 DOM Reference available at:
*
http://www.mozilla.org/docs/dom/domref/
* Tips for upgrading JavaScript for Netscape 7 / Mozilla
*
http://www.mozilla.org/docs/web-deve...upgrade_2.html 
