Using JSP Value in JSTL

JSTL is executed in server side by your servlet container for which Javascript is just a text which would be skipped whereas JavaScript is executed in client side where JSTL is unknown. After the server completes processing JSTL, the generated HTML(if any) from the JSTL along with other JavaScript/HTML will be rendered.

When you pass a JSTL object to a Java Script function , then it will be treated as a String in the Java Script Function. Remember when you pass the values, the total values will be converted as plain String. Or if you send an Object, it will rendered as Object.toString().

So to pass variable to Java Script Function from the JST, Use the following method.

Requirement:

function checkSelection(group,tvalue){
alert(group);
alert(tvalue);
<c:forEach items="${configuredGroupMap}" var="groupMap">
    alert("aa<c:out value="${groupMap.key}"/>");
    <c:if test="${groupMap.key==group}">
        alert("t<c:out value="${groupMap.key}"/>");
        <c:if test="${groupMap.value==tvalue}">
            alert("equal");
        </c:if>
    </c:if>
</c:forEach>
}

it wont go inside after
 <c:if test="${groupMap.key==group}">


Use like this:

function checkSelection(group,tvalue){ 
alert(group); 
alert(tvalue); 
<c:forEach items="${stringshm}" var="groupMap"> 
    alert("<c:out value="${groupMap.key}"/>"); 
    var groupKey = "<c:out value="${groupMap.key}"/>";

    if (groupKey == group){
        alert("<c:out value="${groupMap.key}"/>"); 

    var groupValue = "<c:out value="${groupMap.value}"/>";
        if (groupValue == tvalue){
            alert("both are equal"); 
    }
    }
</c:forEach> }