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From Carlos Sanchez <apa...@cousas.net>
Subject RE: Simple iteration
Date Sun, 12 Oct 2003 22:25:35 GMT
The JSTL specification is clear:

Constraints
If specified, begin must be >= 0.
If end is specified and it is less than begin, the loop is simply not
executed.
If specified, step must be >= 1


> -----Mensaje original-----
> De: Nic Werner [mailto:nic@link11.net] 
> Enviado el: lunes, 13 de octubre de 2003 0:14
> Para: apache@cousas.net
> CC: taglibs-user@jakarta.apache.org; nic@link11.net
> Asunto: RE: Simple iteration
> 
> 
> Heh, yeah that was my workaround eventually, but I just felt 
> that there has to be a better way. It surprises me the tag 
> only supports one direction.
> 
> Not being to start from a negative number while simply 
> 'counting' is odd also. Of course, iterating through a 
> collection wouldn't work, but just counting.
> 
> So I guess if you had a collection of items and you wanted to 
> iterate backwards you would just use the same principle as 
> below but use the index instead.
> 
> > Why not
> >
> > <c:forEach begin="0" end="20" var="i">
> > 	<option>
> > 		<c:out value="${currentYear-i}"/>
> > 	</option>
> > </c:forEach>
> >
> >
> >> -----Mensaje original-----
> >> De: Nic Werner [mailto:nic@link11.net]
> >> Enviado el: domingo, 12 de octubre de 2003 23:34
> >> Para: taglibs-user@jakarta.apache.org
> >> Asunto: Simple iteration
> >>
> >>
> >> This is a simple question, but is there any way to count
> >> *backwards* in JSTL?
> >>
> >> Using the forEach tag, if begin=10 and end=0, I get an: 'end' < 0 
> >> error
> >>
> >> I've also tried using step="-1" to no avail.
> >>
> >> Basically, I want to create a year pulldown box which 
> starts at the 
> >> currentyear and then displays the previous twenty years.
> >>
> >>  <c:forEach begin="${currentYear}" end="${currentYear-20}" 
> step="-1" 
> >> var="year"> <option> <c:out value="${year}"/></option>
</c:forEach>
> >>
> >> - Nic
> >>
> >>
> >>
> >> 
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> >>
> >>
> 
> 
> 
> 



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