On Monday 24 June 2002 19:51, you wrote:
> On Mon, 24 Jun 2002, David Goodenough wrote:
> > > The <c:out> tag, which I assume you'll be using to output the final
> > > value of 'group' here, supports a 'default' attribute that takes care
> > > of this case. Thus, you could write
> > >
> > > <c:out value="${param.group}" default="some default value"/>
> >
> > Are, well actually no, the next thing I want to do with these values is
> > typically some validation or calculation based on the values, not simply
> > return them to the HTML stream for next time around. What I want is the
> > same as the default attribute on the c:out on c:set, so that if the value
> > is null the default is used.
>
> You can get that by nesting:
>
> <c:set var="group">
> <c:out value="${...}" default="${...}"/>
> </c:set>
>
> It's a little more concise than the original and somewhat more
> representative of the amount of work involved: you're performing an
> explicit set based on output.
>
> If every tag had a 'default' attribute, things might get unwieldy. The
> alternative, as you suggest, is some EL-based mechanism; we've considered
> that too but decided, for JSTL 1.0, that the default defaults (so to
> speak) are enough. By that, I mean the coercions to empty values ("") as
> appropriate. For user-defined defaults, we support <c:out> as the
> universal tool.
I don't think that every tag is what I am asking for. THe problem is when
transfering data from outside the tag variables to those variables, i.e. only
on the c:set tag.
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