[Seaside] CSS/JS libs

Thu Jun 24 03:32:41 CEST 2004

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On Jun 22, 2004, at 11:26 AM, Avi Bryant wrote:

> One area where I'm running into trouble is that of CSS files.  These  
> need to be linked in from the <head> section,  which in a streaming  
> model has to be complete before the <body> starts.  That means that  
> all of the needed external CSS has to be determined before rendering  
> any of the body.  This is fine for #style methods on components (we  
> can use #children to collect all of these before starting to render),  
> but it doesn't allow for tricks like StyleGroup  
> (http://lists.squeakfoundation.org/pipermail/seaside/2004-May/ 
> 003047.html), where stylesheets are brought in on demand as IDs or  
> classes from their "group" are referenced.  A similar problem exists  
> for Javascript: ideally the <head> section would bring in any needed  
> Javascript code, but we can't know for sure what's needed until we've  
> rendered the page.  In the case of Javascript, we can use <script>  
> tags in the body itself, but at the least there's some cumbersome  
> management needed to ensure that we don't include the same script  
> multiple times.

Is it possible to generate a link element that points to a stylesheet  
then fill the stylesheet in as you build it?  (My understanding of the  
Seaside/Commanche interaction is that only one request can be processed  
by Seaside at a time, so not having a complete stylesheet would not be  
a problem.)

You may want to look at a post on David Hyatt's weblog on how Safari  
and Mozilla render documents:

http://weblogs.mozillazine.org/hyatt/archives/2004_05.html#005496

The relevant information is about halfway down the page:

   In Safari 1.2 and in Mozilla-based browsers, the heuristic for
   [when to render a page] is quite simple. Both browsers use a
   time delay, and are unwilling to switch to the new page until
   that time threshold has been exceeded.

- -- 
Eric Hodel - drbrain at segment7.net - http://segment7.net
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