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Posted to user@velocity.apache.org by jeff <jl...@houseofdistraction.com> on 2000/12/20 02:29:49 UTC

invalid reference test?

I wanted to check in a template to see $foo was a valid reference.  I
tried

#if (!$foo)
 stuff
#end

then i tried

#if ($foo = null)
 stuff
#end

then I tried

#if ($foo)
#else
 stuff
#end

finally I suceeded with

#if ($foo)

#else
 stuff
#end

Is there a more elegant solution?

Re: invalid reference test?

Posted by jeff <jl...@houseofdistraction.com>.
Ooops.  My bad.  My actual non-working template had

#if ( !$foo )

The problem was extra spaces inside the parenthesis.  I assumed that
extra whitespace would be irrelevant and accidentally left it out of my
report.

"Geir Magnusson Jr." wrote:
> 
> "Geir Magnusson Jr." wrote:
> >
> > jeff wrote:
> > >
> > > I wanted to check in a template to see $foo was a valid reference.  I
> > > tried
> > >
> > > #if (!$foo)
> > >  stuff
> > > #end
> > >
> >
> > You would think this would be the right way.  Hm.  I'll take a look.
> 
> I must be missing something.  The following template :
> 
> #if (!$foo)
>  Hello
> #end
> 
> #set($bar = "woogie")
> #if(!$bar)
>   not bar
> #else
>   \$bar = $bar
> #end
> 
> produces the output
> 
>  Hello
> 
>   $bar = woogie
> 
> This seems right :)  Maybe I didn't understand your post...
> 
> geir
> 
> > > then i tried
> > >
> > > #if ($foo = null)
> > >  stuff
> > > #end
> > >
> > > then I tried
> > >
> > > #if ($foo)
> > > #else
> > >  stuff
> > > #end
> > >
> > > finally I suceeded with
> > >
> > > #if ($foo)
> > >
> > > #else
> > >  stuff
> > > #end
> > >
> > > Is there a more elegant solution?
> >
> > --
> > Geir Magnusson Jr.                               geirm@optonline.com
> > Velocity : it's not just a good idea. It should be the law.
> > http://jakarta.apache.org/velocity
> 
> --
> Geir Magnusson Jr.                               geirm@optonline.com
> Velocity : it's not just a good idea. It should be the law.
> http://jakarta.apache.org/velocity

Re: invalid reference test?

Posted by Christoph Reck <Ch...@dlr.de>.
Note that if a 
  #set( $foo = "woogie" )
preceeded a
  #set( $foo = $list.get(1000) )## nonexistent entry!
then
  #if( !$foo )
    All OK
  #else
    Why is \$foo = "woogie"?
  #end
produces unexpected output.

So we need to consider changing from Hashtable to HashMap.

:) Christoph


> > This seems right :)  Maybe I didn't understand your post...
> >
> > geir
> 
> Maybe some more information about what Jeff's $foo object is would be
> helpful.
> 
> :-)
> 
> -jon

Re: invalid reference test?

Posted by Jon Stevens <jo...@latchkey.com>.
on 12/19/2000 7:29 PM, "Geir Magnusson Jr." <ge...@optonline.net> wrote:

> This seems right :)  Maybe I didn't understand your post...
> 
> geir

Maybe some more information about what Jeff's $foo object is would be
helpful.

:-)

-jon

-- 
Honk if you love peace and quiet.

Re: invalid reference test?

Posted by "Geir Magnusson Jr." <ge...@optonline.net>.
"Geir Magnusson Jr." wrote:
> 
> jeff wrote:
> >
> > I wanted to check in a template to see $foo was a valid reference.  I
> > tried
> >
> > #if (!$foo)
> >  stuff
> > #end
> >
> 
> You would think this would be the right way.  Hm.  I'll take a look.

I must be missing something.  The following template :

#if (!$foo)
 Hello
#end

#set($bar = "woogie")
#if(!$bar)
  not bar
#else
  \$bar = $bar
#end

produces the output

 Hello

  $bar = woogie

This seems right :)  Maybe I didn't understand your post...

geir


> > then i tried
> >
> > #if ($foo = null)
> >  stuff
> > #end
> >
> > then I tried
> >
> > #if ($foo)
> > #else
> >  stuff
> > #end
> >
> > finally I suceeded with
> >
> > #if ($foo)
> >
> > #else
> >  stuff
> > #end
> >
> > Is there a more elegant solution?
> 
> --
> Geir Magnusson Jr.                               geirm@optonline.com
> Velocity : it's not just a good idea. It should be the law.
> http://jakarta.apache.org/velocity

-- 
Geir Magnusson Jr.                               geirm@optonline.com
Velocity : it's not just a good idea. It should be the law.
http://jakarta.apache.org/velocity

Re: invalid reference test?

Posted by "Geir Magnusson Jr." <ge...@optonline.net>.
jeff wrote:
> 
> I wanted to check in a template to see $foo was a valid reference.  I
> tried
> 
> #if (!$foo)
>  stuff
> #end
> 

You would think this would be the right way.  Hm.  I'll take a look.

geir

> then i tried
> 
> #if ($foo = null)
>  stuff
> #end
> 
> then I tried
> 
> #if ($foo)
> #else
>  stuff
> #end
> 
> finally I suceeded with
> 
> #if ($foo)
> 
> #else
>  stuff
> #end
> 
> Is there a more elegant solution?

-- 
Geir Magnusson Jr.                               geirm@optonline.com
Velocity : it's not just a good idea. It should be the law.
http://jakarta.apache.org/velocity