Re: Howto check if hdf is empty (in perl)

In C, you'd call hdf_get_obj, and a NULL return would indicate it didn't
exist.  You can then call hdf_obj_value to check the value.

I'm not a perl expert, but the ClearSilver.xs defines a ClearSilver::HDF
getObj call, which also appears to return NULL.  I don't know how that
translates to perl, though.  There's also a objValue.

In CS templates, the ? operator checks for existence, and == "" would
check empty.  Its possible you would have to check both due to coercion
(a non-existent HDF node compared to a string is an empty string), so
you'd need to do <?cs if:?Page.Menu && Page.Menu == "" ?> to say exists
and is empty.

Brandon

On 08/05/09 petr.vorel uttered the following other thing:
> Hello,
> 
> can you tell me 
> 1) howto check if hdf exists, but it's empty (in perl template)
> 2) howto check if hdf does not exist (in perl template)
> 
> <?cs if: ?Page.Menu ?> does not help...
> 
> Thanks a lot.
> 
> Pev
> 
> 
> 
> ------------------------------------
> 
> Yahoo! Groups Links
> 
> 
> 
-- 
  "The meek shall inherit the earth; now let's check out who gets heaven."
        -- J. Neil Shulman
                                           http://www.fiction.net/blong/