Share vars between scriptlet and jstl?

[Robert Mark Bram]

Hi All!

Can variables be shared between 'contexts' like this?


<%
Table i = new Table();
%>
<c:set var="noRows" value="${i.noRows}" />
<c:set var="noCols" value="${i.noCols}" />


Alternatively, how would I instantiate a Table object with a JSTL tag?

Rob

 

[Ryan Stewart]

Hi All!

Can variables be shared between 'contexts' like this?


<%
Table i = new Table();
%>
<c:set var="noRows" value="${i.noRows}" />
<c:set var="noCols" value="${i.noCols}" />


Alternatively, how would I instantiate a Table object with a JSTL tag?

JSTL operates on variables stored in one of the four contexts: page, request,
session, and application. Simply declaring a variable does not place it in any
of those scopes. To do so, you invoke the setAttribute method on the object
corresponding to whichever scope in which you want to store the variable. The
objects are pageContext, request, session, and application. So to make your
Table available to JSTL, use:
<%
Table i = new Table(); // What kind of name is "i"?
pageContext.setAttribute("i", i);
%>

That will store a reference to the object referenced to by variable i in the
page scope with a name of "i", making it accessible to JSTL. You could also use
request.setAttribute("i", i);

or session.set... or application.set...

Better to get all scriplets out of your JSPs and do that kind of thing in a
controller of some sort.