calling a method in c:if tag

["Barnett, Brian W." <bb...@scholarinc.com>]

I have a List object as a request scoped variable and I want to call a
method on it as the test of a c:if statement. Is this a "no no"? All the
examples I see for c:if use bean objects in the test.  I've tried using the
List object with a number of different syntaxes, but I get "error occurred
while evaluating custom action attribute 'test'" errors.

 

Tried:

<c:if test="${!empty schoolList}">

<c:if test="${!empty requestScope.schoolList}">

<c:if test="${!empty requestScope.schoolList[0]}">

 

What I really want to do is something like this:

<c:if test="${schoolList.size() > 0}">.

 

When I try it, I get this error:

 

[ServletException in:/WEB-INF/jsp/SchoolList.jsp]
javax.servlet.jsp.JspException: An error occurred while evaluating custom
action attribute "test" with value "${schoolList.size > 0}": The "."
operator was supplied with an index value of type "java.lang.String" to be
applied to a List or array, but that value cannot be converted to an
integer. (null)'

 

Re: calling a method in c:if tag

[Felipe Leme <ja...@felipeal.net>]

On Thu, 2004-05-27 at 20:04, Barnett, Brian W. wrote:
> I have a List object as a request scoped variable and I want to call a
> method on it as the test of a c:if statement. Is this a "no no"? 
 
No, this is a "no yes" :-): no, you can't do it on JSTL 1.0, but yes,
you can on JSTL 1.1, using EL functions.


> What I really want to do is something like this:
> 
> <c:if test="${schoolList.size() > 0}">.

On JSTL 1.1, you could use:

<c:if test="${fn:length(schoolList) > 0}">

BTW, there is a similar example on Sun's Web Service tutorial:

http://java.sun.com/webservices/docs/1.3/tutorial/doc/IntroIWA5.html



Felipe



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