Liferay is easy: How to access JSTL variable in Scriptlets

Friday, June 22, 2018

How to access JSTL variable in Scriptlets

Sometimes we have a situation in which we need to access JSTL in our scriptlets. Today we will solve this problem. Here i need to call a simple method greetUser that take screen name as a argument.

Problem
When we try to access this we have the errors like:-

	<%@page import="com.test.Demo"%>
	<%@page import="com.liferay.portal.model.User"%>
	<%@page import="java.util.List"%>
	<%@page import="com.liferay.portal.service.UserLocalServiceUtil"%>
	<%@ taglib uri = "http://java.sun.com/jsp/jstl/core" prefix = "c" %>

	<%
	List<User> userList = UserLocalServiceUtil.getUsers(1, 5);
	request.setAttribute("userList", userList);// put in request so that we can access this in EL
	%>

	<c:forEach items="${userList}" var="user">

	Greetings :- <%=Demo.greetUser(user.getScreenName()) %><br> // Error
	OR
	Greetings :- <%=Demo.greetUser(${user.screenName}) %><br> // Error
	OR
	Greetings :- <%=Demo.greetUser(<%=user.screenName%>) %><br> // Error

	</c:forEach>

view raw problem.jsp hosted with ❤ by GitHub

Solution
For solving this situation we first put the screenName in pageContext using c:set and then use this to call out method.


	<%@page import="com.test.Demo"%>
	<%@page import="com.liferay.portal.model.User"%>
	<%@page import="java.util.List"%>
	<%@page import="com.liferay.portal.service.UserLocalServiceUtil"%>
	<%@ taglib uri = "http://java.sun.com/jsp/jstl/core" prefix = "c" %>

	<%
	List<User> userList = UserLocalServiceUtil.getUsers(1, 6);
	request.setAttribute("userList", userList);// put in request so that we can access this in EL
	%>

	<c:forEach items="${userList}" var="user">

	<c:set var="screenName" value="${user.screenName}" scope="page" />
	<%
	String screenName = String.valueOf(pageContext.getAttribute("screenName"));
	String greetName = Demo.greetUser(screenName);
	%>

	Greetings :- <%=greetName %><br>

	</c:forEach>