JSTL | Top 10 JSTL statements most often used !!!

It is highly recommended to use JSTL to build JSP Pages in WCS: ${...} --Expression Language

• Naming Convention of methods in Bean for boolean check

                      boolean itemsReturned=false;

                      public boolean isItemsReturned() {

                             return itemsReturned;

                       }

    
<if test="${!orderStatus. itemsReturned }">
                  </c:if>

• Setting Variables in a JSP:






<c:set var="status" value="P"/>

<c:set var="errorZipCounter" value="0" />

<c:set var="accDisplaycount" value="${accDisplaycount + 1 }" />

• If, Else this is the equivalent of If Else as JSTL does not have the usual If Else

<c:choose>

<c:when test="${!empty WCParam.source}">

<c:set var="source" value="${WCParam.source}" />

</c:when>

<c:otherwise>

<c:set var="source" value="${source}" />

</c:otherwise>

</c:choose>

• For statement: counter is current status variable, you could get index\first\last\current\count status.

<c:forEach items="${orderList}" var="order" varStatus="counter">

If the orderList is a list of orderdatabeans or something, you could loop through them

</c:forEach>

• If statment example:

<c:if test="${(!empty WCParam.orderStatus && (WCParam.orderStatus eq 'Y'))}">

You can use eq,ne,lt,gt,ge,le other relational operators

</c:if>

• Constructing hyperlinks: Prep-ends the name of current servlet context,URl encoding of request params and values, URl re-writing for session management.

<a href="<c:url value='/content/sitemap.jsp'/>">View sitemap</a>

<c:url var="productDisplayURL" value="ProductDisplay">

<c:param name="catalogId" value="${WCParam.catalogId}"/>

<c:param name="storeId" value="${WCParam.storeId}"/>

<c:param name="langId" value="${WCParam.langId}"/>

<c:param name="productId" value="${accessoryItem.itemId}"/>

</c:url>

• Include content of a JSP into another JSP:

<c:import url="../../CurrentOrderSection/OrderItemDetailsDisplay.jsp">

<c:param name="orderId" value="${WCParam.orderId}"/>

</c:import>

<% out.flush(); %>

<c:import url="${storeDir}include/footer.jsp"/>

<% out.flush(); %>

<% out.flush(); %><c:import url="{storeDir}include/header.jsp"/><% out.flush(); %>

• Removes a variable from scope:

<c:remove var="wishListURL" scope="page"/>

• Print the value: Also helpful to print values in JavaScript. The <c:out> tag evaluates an expression and outputs the result on the page

status:<c:out value="${WCParam.status}"/>

firstName:<c:out value="${orderDetailsVB.orderBillingAddress.firstName}"

<script language="javascript" src="<c:out value="${storeJavascriptDir}/browser_detect.js" />"></script>

• Using functions: There are several functions that are very helpful

var paramvalues = "<c:out value="${fn:substring(config.params, 1, -1)}" escapeXml="false"/>";

<c:set var="dispalyPrice" value="${fn:substringAfter(orderItemTotalPrice,)}"/>

<c:when test="${fn:indexOf(locale, 'en') >= 0}">

</c:when>

• useBean to instantiate and auto populate the bean

<wcbase:useBean id="orderDetailsVB" classname="com.abc.order.beans.OrderDetailsViewBean">

<c:set target="${orderDetailsVB}" property="orderId" value="${WCParam.orderId}"/>

<c:set target="${orderDetailsVB}" property="orderStatus" value="${status}"/>

</wcbase:useBean>

<wcbase:useBean id="productVB" classname="com.abc.catalog.beans.ItemViewBean" scope="request" >

<c:set target="${productVB}" property="itemId" value="${WCParam.catentryId}" />

</wcbase:useBean>