[pmwiki-devel] Detecting existence of Trail

[Martin Fick]

--- Kathryn Andersen
<kat_lists at katspace.homelinux.org> wrote:

> Is there some way that I can detect the existence of
> a trail on a given page?  I know that if I do a 
> pagelist where trail=Some.Page and there
> isn't a trail then there won't be any output.  But
> is there some way of creating an (:if condition:) 
> that will detect that?

I don't know of any way yet outside of a pl template
to do this, but I think that you can get what you want
by using the pagelist template, see below...
 

> The reason I want this, is that I want to be able to
> say
> 
> if there is a trail on the current page
>         do nothing
> else
>         do this pagelist
> ifend
> 
...
> (:pagelist group=Books link={*$FullName}
> fmt=#title:)

... 
> Is there some way of doing this?

Try putting your pagelist inside another pagelist
template like this:

(:pagelist trail={$FullName} fmt=#notrail:)

[[#notrail]]
(:template first:)
(:if equal {>$Group}:)
(:pagelist group=Books link={*$FullName}
 fmt=#title:)
[[#notrailend]]


If there is a trail on the current page you should get
nothing from the first pagelist.  If however the trail
is blank, the template should invoke the second
pagelist.

-Martin



 
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