Frequent JSTL use in IBM WCS

1.     Control statement :

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

                  </c:if>

2.      Setting Variables in a JSP:

 <c:set var="status" value="P"/>

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

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

3.  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>

4. 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>

5. 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>

6.  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>

7.  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(); %>

8. Removes a variable from scope:

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

9. 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>

10. 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>

11. useBean to instantiate and auto populate the bean

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

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

</wcbase:useBean>