Question

I want to do something like this to call a JSP 2.0 tag:

<mytags:foo abc='<%=def%>'>   <mytags:bar ghi='<%=jkl%>'/> </mytags:foo> 

Where Strings def and jkl are defined earielr in the jsp file. Suppose my tag files look like this:

foo.tag:

<%@ tag body-content='scriptless' %> <%@ attribute name='abc' required='true' %> <div class='${abc}'>   <jsp:doBody/> </div> 

bar.tag:

<%@ tag body-content='scriptless' %> <%@ attribute name='ghi' required='true' %> <div>${ghi}</div> 

I want the output to look like this:

<div class='def'> <div>jkl</div> </div> 

(assuming the variables def and jkl were initialized to def and jkl, respectively, in the calling JSP file.)

The outer tag gets its attribute just fine (<div class='def'>) but the inner one fails.

Is this possible? I am getting errors that jkl cannot be resolved.

Answer 1

Note the body-content='scriptless' attribute in the tag directive. This means that the body surrounded by the tag can’t contain scriptlet code (the <% %> stuff). You need to use EL.

It works for me if I change the stuff in the JSP to:

  <c:set var='def' value='def'></c:set>   <c:set var='jkl' value='jkl'></c:set>    <mytags:foo abc='${def}'>       <mytags:bar ghi='${jkl}'/>   </mytags:foo> 

Note that I need to add <%@ taglib prefix='c' uri='http://java.sun.com/jsp/jstl/core' %>