More details to my previous posting...
I am building an app with Struts 1.x, which is dynamically rendered at
runtime to create html form elements. Because of the applications dynamic
nature, I am using map backed struts action form to dynamically capture the
values in a HashMap.
Unfortunately, for multiple select box, the object value being set to the
map was always a String than a String[]. The same case applies to checkbox.
Am I using map backed struts action form properly. Is there any other
approach to build a dynamic form and actions!! Your help is much
appreciated.
I am pasting a sample test form and action form below.
form.jsp
***
%@ page language=java contentType=text/html; charset=ISO-8859-1
pageEncoding=ISO-8859-1%
!DOCTYPE html PUBLIC -//W3C//DTD HTML 4.01 Transitional//EN
http://www.w3.org/TR/html4/loose.dtd;
%@ taglib uri=http://struts.apache.org/tags-bean; prefix=bean%
%@ taglib uri=http://struts.apache.org/tags-html; prefix=html%
%@ taglib uri=http://struts.apache.org/tags-logic; prefix=logic%
html
head
meta http-equiv=Content-Type content=text/html; charset=ISO-8859-1
titleMyTestForm/title
/head
body
html:form action=/myTestAction.do
html:select property=value(myTestProperty) multiple=true
html:option value=option1option1/html:option
html:option value=option2option2/html:option
html:option value=option3option3/html:option
html:option value=option4option4/html:option
html:option value=option5option5/html:option
/html:select
pnbsp;/p
html:submit property=submit/html:submit
/html:form
/body
/html
formResults.jsp
%@ page language=java contentType=text/html; charset=ISO-8859-1
pageEncoding=ISO-8859-1%
!DOCTYPE html PUBLIC -//W3C//DTD HTML 4.01 Transitional//EN
http://www.w3.org/TR/html4/loose.dtd;
%@ taglib uri=http://struts.apache.org/tags-bean; prefix=bean%
%@ taglib uri=http://struts.apache.org/tags-html; prefix=html%
%@ taglib uri=http://struts.apache.org/tags-logic; prefix=logic%
html
head
meta http-equiv=Content-Type content=text/html; charset=ISO-8859-1
titleResults/title
/head
body
Selected values arebr
bean:write name=myTestForm property=value(myTestProperty) /
/body
/html
MyTestForm is
package test;
import java.util.HashMap;
import java.util.Map;
import org.apache.struts.action.ActionForm;
public class MyTestForm extends ActionForm
{
private static final long serialVersionUID = 1L;
private static final Map values = new HashMap();
public void setValue(String key, Object value)
{
if (value instanceof String)
{
System.out.println(Doesnt work!!! valueof a multiple select is a
string);
}
else if (value instanceof String[])
{
System.out.println(cool. It works!!! value is a string array);
}
else
{
System.out.println(Some other object);
}
values.put(key, value);
}
public Object getValue(String key)
{
return values.get(key);
}
}
*
MyTestAction
package test;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
public class MyTestAction extends Action
{
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) throws Exception
{
String[] myTestProperty = new String[0];
if (request.getParameterValues(value(myTestProperty)) != null)
{
myTestProperty =
request.getParameterValues(value(myTestProperty));
}
for (int i = 0; i myTestProperty.length; i++)
{
System.out.println(myTestProperty[i]);
}
ActionForward forward = mapping.findForward(success);
return forward;
}
}
Struts-config defintion
form bean defintion
form-bean name=myTestForm type=test.MyTestForm/form-bean
action defintion
action path=/myTestAction name=myTestForm type=test.MyTestAction
scope=session validate=false
forward name=success path=/formResults.jsp/forward
/action
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