[jira] Commented: (TAPESTRY-199) Addition of a simple way to get component CSS stylesheets into an overall page

["Markus Joschko (JIRA)" <ta...@jakarta.apache.org>]

    [ http://issues.apache.org/jira/browse/TAPESTRY-199?page=comments#action_12316621 ] 

Markus Joschko commented on TAPESTRY-199:
-----------------------------------------

Just wanted to stress that I think it would be very usefull to apply this patch to the codebase.
Having a way to add CSS within a component to the surrounding page is really crucial for todays webcomponents. 

> Addition of a simple way to get component CSS stylesheets into an overall page
> ------------------------------------------------------------------------------
>
>          Key: TAPESTRY-199
>          URL: http://issues.apache.org/jira/browse/TAPESTRY-199
>      Project: Tapestry
>         Type: Bug
>   Components: Framework
>     Versions: 3.0
>  Environment: Operating System: All
> Platform: All
>     Reporter: Scott Ellsworth
>     Assignee: Tapestry Developer List
>  Attachments: patch.txt
>
> As I understand it, if a component requires a CSS stylesheet, you either have to put <style> commands 
> in the generated HTML or you have to change the global page when you add the component.
> The first method means that the user would find it hard to override or change the component, as well 
> as increased overhead and blowing out the browser cache.
> The second method breaks component isolation.  Essentially, the main page for an app suddenly must 
> be concerned about the styles used by various subcomponents.
> I believe we would be well served by enhancing the @Shell component to automatically pick up the 
> stylesheets declared as needed in subcomponents.  The situation is similar to how @Body picks up 
> @Script components and tucks them into just one Javascript block.
> This would require a way for a component to register the stylesheets it uses.  I would expect a tag in 
> the jwc that sets the IAsset stylesheet/stylesheets, as then the top level component could just look for 
> those assets in the contained items.
> I would expect, then, that the top level stylesheet/stylesheets passed into the @Shell component would 
> be augmented silently.  There is an argument for a "useComponentStylesheets" attribute that is by 
> default true to control this behavior.
> The result would be that a user would not need to know that a component has added a stylesheet, 
> because it would just work.  It would be snazzy if the addition was smart enough to only include a 
> stylesheet onec if there were multiple instances of the same component, or if there were two 
> components using the same stylesheet.

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