On Friday, 10. January 2003 12:36, Kjetil Kjernsmo wrote:
> > Another idea that strikes me, wouldn't it be handy instead to have a
> > generic taglib that serves the same purpose? Not just
> > AxKit::XSP::Auth has true/false tags. Didn't think further about that
> > yet, but what do you think?
>
> Absolutely! :-) It occured to me that many if not most of the situations
> where you have
> <xsp:logic>if (<ns:something blah blah>) { ... } </xsp:logic>
> where <ns:something> is returning boolean, could be replaced more
> elegantly with such a construct.
>
> So, absolutely, I think this would be a really good idea.
The problem is, what syntax would one use. If we use something XSLT'ish, the
result would probably look like
<cond:if><cond:expr><ns:something-boolean/></cond:expr><cond:action><p>true</p></cond:action></cond:if>
which is longer but not really prettier than
<xsp:logic>if (<ns:something-boolean/>) {<p>true</p>}</xsp:logic>
now, with some evil intentions it might (should) be possible to do this:
<cond:if tag="ns:something-boolean"><p>true</p></cond:if>
(where we could also supply other attribs, like expr="$foo == 1" or
param="some_query_param", so it would serve multiple purposes)
Only I'm still not entirely happy, especially regarding the auth taglib:
<xsp:logic>if (<auth:get-single-access type="user"/> eq 'guest') {<p>sorry,
only for registered users</p>}</xsp:logic>
I don't yet see an elegant solution for this... and then there is the "else".
In the end, for those who like having no perl code at all in their XSP, I
suggest this one:
<cond:if>
<cond:expr><ns:tag/></cond:expr>
<cond:true><p>yeah!</p></cond:true>
<cond:false><p>oh no!</p></cond:false>
</cond:if>
salted with alternatives for:
<cond:when value="42"><p>hey, not just true but the answer!</p></cond:when>
<cond:otherwise><p>too bad nothing matches my expectations</p></cond:when>
so we get the XSP equivalent of <xsl:choose>. As with most taglibs, collapsing
subelements into parent attributes would be possible as well:
<cond:if expr="$foo == 42">...</cond:if>
But really... would people use that?
--
CU
Joerg
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