When using jstl there is no need to specify the scope. Just use something like
<c:if test="${! empty login_user}" >
this will check if the login_user is null. The tag will search through all the the scopes. (i.e. page, request, session, application)
Hope this helps.
Nathan
On Apr 17, 2004, at 7:01 PM, Ricky Lee wrote:
hi, thanks for reading..
i have a problem about set the seesion(pageContext) in the action class..
i know that set the seesion in the request, just like
request.getSession().setAttribute("login_username",userForm.getUsername ());
and in the JSP page, we can use the code to get the seesion:
<%=request.getSession().getAttribute("login_username")%>
but, i want to use the pageContext to set the session so as to load the attribute in JSTL
<c:if test="${....}}">...</c:if>
if i use <c:if test="${session.login_username == null}">...</c:if> it can't work...
because there isn't login_username in the session pageContext.
if i use <c:if test="${request.getSession().getAttribute("login_username") == null}">..</c:if>
it still cause a error....syntax error...
i know in the custom taglib, we can use the the
pageContext.setAttribute(String,Object,scope) the scope can set to "session"
and in the JSP page, we can use the JSTL to get the attribute..
but in the Action class , there isn't pageContext object to set the session in the pageContext, just has the request to set pageContext, what should i do to set the session in the pageContext?
please help me....thanks!
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