In building the Struts-EL tag library, I haven't ported Struts tags that
provide functionality that are directly supported in the JSTL. However, in
some of those tags I haven't ported, I have noticed one small feature that
isn't strictly provided in their JSTL analogs.
The issue is "default values". For instance, in the Struts "bean:cookie" tag,
it will assign the value of a cookie to a variable, but if the cookie isn't
defined, you can specify a default value that will be assigned to the variable.
There are a couple tags in the "bean" library that have this feature.
In the JSTL, there's no "quick" way to get this. I believe, for each variable
that you want to have a default value, you'd do something like this, after
every "c:set" (perhaps) that reads a value you hope is defined:
<c:if test="${empty variable}">
<c:set var="variable" value="default value"/>
</c:if>
(I guess this avoids the question of the difference between a null string and
an empty string.)
If I were to suggest an enhancement, it would be a "default" attribute on
"c:set" that can take an EL expression. Is there any perception that this
might have enough value for a formal enhancement report?
--
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David M. Karr ; Java/J2EE/XML/Unix/C++
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