I am using Spring 2.5 in my application. In the view I have main jsp in which I have included another jsp. I have declared a variable using c:set tag in main jsp which I can not access inside the jsp. Below is code
main.jsp
<c:set var="hPediquestStudy"><spring:message code="study.hpediquest.mapping" /></c:set>
<c:set var="currentStudy" value='<%=(String)session.getAttribute("currentStudy")%>'/>
<html>
<head>
</head>
<body>
<c:if test="${currentStudy eq hPediquestStudy}">
Variables are equal
</c:if>
<c:if test="${currentStudy ne hPediquestStudy}">
Variables are not equal
</c:if>
<jsp:include page="/WEB-INF/jsp/included.jsp"></jsp:include>
</body
</html>
included.jsp
<c:if test="${currentStudy eq hPediquestStudy}">
hPediquestStudy Variable is accessible
</c:if>
<br/>currentStudy : ${currentStudy}
<br/>hPediquestStudy : ${hPediquestStudy}
I am getting output
Variables are equal
currentStudy : hPediquest
hPediquestStudy :
Why on main jsp both values are equal while in included jsp I dont see its value?
Why currentStudy displays its value inside the included jsp?
is there any solution which helps me to access the variable set in the parent jsp ans can be accessed in the included jsps?
I can see the value of hPediquestStudy value if I set that variable in included jsp like in main jsp. But I dont want to set it every time when I include the jsp. Please help
Why on main jsp both values are equal while in included jsp I dont see its value?
Because <c:set> by default stores them in the page scope.
Why currentStudy displays its value inside the included jsp?
Because it's available as session attribute as well.
is there any solution which helps me to access the variable set in the parent jsp ans can be accessed in the included jsps?
You need to set the scope attribute of <c:set> to request or above. The (default) page scope is exposed to current JSP only, not any included JSPs.
Note that the line
<c:set var="currentStudy" value='<%=(String)session.getAttribute("currentStudy")%>'/>
is unnecessary. The ${currentStudy} will already scan for variables in page, request, session and application scopes. As you've apparently already set it in the session scope, you don't need to copy it into the page scope. So, just remove that line. All with all, your top 2 <c:set> lines should be replaced with this single line:
<c:set var="hPediquestStudy" scope="request"><spring:message code="study.hpediquest.mapping" /></c:set>
and then it'll work the way you intended.
See also:
Our EL wiki page
Related
I'm using facelets (JSF2.1) and I'm trying to do something like:
<c:forEach var="domainObject" items="#{MB.listOfDomainObjects}">
<sec:authorize access="hasPermission(#domainObject,'PERMISSION_X')">
hello world
</sec:authorize>
</c:forEach>
I've tried changing #domainObject by #domainObject, #{domainObject}, $domainObject and a lot of other combinations with the same result: domainObject is not processed correctly. Sometimes I get an error saying the page cannot be constructed, others domainObject is null.
It's like the scope where the tag c:forEach puts the variable domainObject is not scanned by sec:authorize to find it.
I've tried also to force the use of a scope using the tag <c:set ... scope="view"/>. I've also tried to use <ui:repeat> with the same results, but considering the tag sec:authorize is a jstl one, I suppose is executed in build time (like c:forEach) and not in render time (like ui:repeat), so I think I must use c:foreach and not ui:repeat.
Any chance to solve my problem?
I'm trying to get an example of passing a list from JSP to the Controller to work:
http://viralpatel.net/blogs/spring-mvc-multi-row-submit-java-list/
the problem I have with this example is that I do not get the JSP /WebContent/WEB-INF/jsp/add_contact.jsp to work. He has the line:
<c:foreach items="${contactForm.contacts}" var="contact" varstatus="status">
and i'm getting errors with the varstatus variable. From where is he getting the values for this variable? He is using it as a list row index, but from where should the values come? I get the warning in eclipse that it is a not defined variable varstatus and if i still deploy it to tomcat, then i get the error that jstl foreach tag does not support more than one variable (as i already have the contact there).
The forEach tag and attributes are case sensitive.
<c:forEach items="${contactForm.contacts}" var="contact" varStatus="status">
<c:out value="${status.index}" />: <c:out value="${contact}" />
</c:forEach>
It's possible the error messages generated by Eclipse are misleading. It's also possible the error is originating from somewhere else on the page. If this does not resolve the problem, post the full JSP and stacktrace for better understanding.
I am new to Thymeleaf and converting my Web page from JSP to Thymeleaf. I have a strut tag like this:
<c:set var="someVariable" value="${someValue}"/>
That variable can be used anywhere in JSP. Is there any such alternatives for this in Thymeleaf?
You can use local variables.
Declare an HTML element with a th:with attribute. For example
<div th:with="someVariable=${someValue}">
The documentation states
When th:with is processed, that [someVariable] variable is created as a
local variable and added to the variables map coming from the context,
so that it is as available for evaluation as any other variables
declared in the context from the beginning, but only within the bounds
of the containing tag.
Just a note, if you wish to assign more than one variable, separate them with a comma :
<div th:with="someVariable=${someValue},anotherVariable=${anotherValue}">
See the third example : Local Variable section of Thymeleaf documentation
declare with th:with="varName=${'str'}
ref with in src th:src="#{${varName}}"
in more detail:
<head th:with="component =${'/static/component'}, bizJs = ${'/static/js/biz'}">
<span th:text="${component}"></span>
<script th:src="#{(${component})}"></script>
<script th:src="#{${bizJs} + '/static/js'}"></script>
</head>
I have in my JSP page code like this:
<spring:url value="" var="url"/>
EN
And issue is that parameter url in link is always set to empty String.I would expect that if I type url like localhost:8080/test the url variable will hold this value and it will be replaced in link so it would look like /change_locale?locale=EN¤t=test. However it is always generated like /change_locale?locale=EN¤t=.What I am doing wrong? Best regards
In
<spring:url value="" var="url"/>
Your value value is the empty String. Because of this, the URL is relative.
Spring uses UrlTag to construct the value from a <url> tag. You'll want to take a look at its createUrl method in the source code if you're curious.
In this case, it will generate a value that is the empty String and store it in a page scope attribute named url. That's what you get when rendering
${url}
A jstl variable is set in request scope in a jsp
<c:set var="name" value="Tiger" scope="request" />
This variable is accessed from a jspf included to this jsp. Now, is there any difference in accessing the variable in these two ways ?
1) <c:out value="${name}" />
2) <c:out value="${requestScope.name}" />
When to use requestScope ?
You use requestScope when you absoluetely want your object to come from the request, and not from the page, session or application scope. Inded, using ${name} will search for a name attribute in the page, then in the request, then in the session, then in the application.
Let's say that some other code in the JSP set a name attribute in the page scope. But you want to access the name in the request: you're forced to use requestScope.
Let's say the session might have a name attribute. Not using requestScope.name would return the session-scoped name if the JSP forgot to set the name attribute in the request scope.
If the goal of the JSP fragment is to access something set in the enclosing JSP, maybe this JSP fragment should be a JSP tag, and you should pass the name as an argument to this tag.
Within my research (I am also new one for jstl),
request scope can set values to request page from response page for example assume that we have a page called index.jsp and its action page is index_action.jsp
if we, set values to the action page
<c:set var="nme" scope="request" value="Janaka aravinda"/>
<% request.getRequestDispatcher("index.jsp").forward(request, response); %>
(// I created nme variable and set its value as Janaka aravinda. and back to reload request page(index.jsp) )
Now we can call nme in index.jsp nme variable as follow
Request value
<c:out value="${nme}"/>