When I try to use <s:doubleselect/> ,it does not work.
below is a segment of the exception thrown
Expression parameters.formName is undefined on line 76, column 43 in
template/simple/doubleselect.ftl.
The problematic instruction:
----------
==> ${parameters.formName} [on line 76, column 41 in
template/simple/doubleselect.ftl]
in include "/${parameters.templateDir}/simple/doubleselect.ftl" [on line 3,
column 1 in template/xhtml/doubleselect.ftl]
----------
Java backtrace for programmers:
----------
freemarker.core.InvalidReferenceException: Expression parameters.formName is
undefined on line 76, column 43 in template/simple/doubleselect.ftl.
at freemarker.core.TemplateObject.assertNonNull(TemplateObject.java:124)
at freemarker.core.Expression.getStringValue(Expression.java:118)
at freemarker.core.Expression.getStringValue(Expression.java:93)
at freemarker.core.DollarVariable.accept(DollarVariable.java:76)
at freemarker.core.Environment.visit(Environment.java:196)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
below is the complete code.I use doubleselect.action to test the page,
doubleselect.jsp is also tested,both donot work.
<%@ page pageEncoding="utf-8" %>
<%@ page contentType="text/html;charset=utf-8" %>
<%request.setCharacterEncoding("utf-8"); %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd";>
<html xmlns="http://www.w3.org/1999/xhtml";>
<head>
<title>Struts 2 Cool Tags - <s:doubeselect/ ></title>
<s:head />
</head>
<body>
<h2><s:doubleselect/></h2>
<s:form action="Store" >
<s:set name="foobar"
value="# {'Java': {'Spring', 'Hibernate', 'Struts 2'}, '.Net': {'Linq', '
ASP.NET 2.0'}, 'Database': {'Oracle', 'SQL Server', 'DB2', 'MySQL'}}" />
<s:doubleselect list="#foobar.keySet()"
doubleName="technology"
doubleList="#foobar[top]"
label="Technology" />
</s:form>
</body>
</html>
