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Helpful JSTL Examples
These are JSTL JSP Examples I use all the time and I use this as a reference
How to get size/length of collection use fn:length like so
<c:if test="${fn:length(results) == 1}">
You have one result
</c:if>
Links
<html:link page="/tni/telnoLookup.do" >
Telephone Number Inventory
</html:link>
Similar to Struts <html:link page=”” /> using c:url
<c:url var="detailUrl" value="/${module}/lookupOptions.do">
<c:param name="dispatch" value="phdetailBySubno"/>
<c:param name="subno" value="${resultsVal.subno}"/>
<c:param name="main" value="${resultsVal.main}" />
</c:url>
<a href="<c:out value="${detailUrl}" />">
<c:out value="${name}"/>
</a>
Format a telephone number
If the telno is still an unformatted string object as in the case of the result list of dtos
<c:out value="${fn:substring(resultsVal.telno, 0, 3)}-${fn:substring(resultsVal.telno, 3, 6)}-${fn:substring(resultsVal.telno, 6, 10)}" />
If loading from form bean use Utility.maskTn()
<c:out value="${formBean.telno}" />
Format Date
<bean:write name="resultsVal" property="efdte1" formatKey="display.date.format"/>
Or using JSTL
<fmt:formatDate value="${resultsVal.efdte1}" pattern="MM/dd/yyyy" />
Both produce format
10/10/2002
Format Time
If the time is still a date object as in the case of the result list of dtos
<bean:write name="resultsVal" property="time" formatKey="display.time.format"/>
Trying to go from one string in time formatted to another
<fmt:parseDate value="${formBean.enttme}" var="enttme" pattern="hh:mm:ss a" />
<fmt:formatDate type="time" pattern="HH:mm:ss" value="${enttme}" />
If already parsed date into a String by Utility.timeToString, as in the case of a formBean, its already in the correct format
<c:out value="${formBean.enttme}" />
Dropdown
<html:select property="rsvflg" styleId="rsvflg" size="1" styleClass="stdtext" >
<html:option value=""></html:option>
<html:option value="R">R - Reserved</html:option>
</html:select>
Or with a collection or array of beans
<html:select property="frmcic" styleId="frmcic" size="1" styleClass="stdtext" onchange="tabNext(this);">
<html:option value=""></html:option>
<html:optionsCollection property="cicmap" value="key" label="value" />
</html:select>
Dropdown with multiple options (from ap/SummaryCheckReport)
Note the companyArray is a string array
<html:select name="apForm" property="companyArray" size="5"
styleClass="stdtext" styleId="compBox" multiple="true" title="this is a title">
<c:if test="${ ! empty apForm.companyList}">
<html:optionsCollection name="apForm" property="companyList"
value="company" label="name" />
</c:if>
</html:select>
Dropdown with more complex label than can be done with optionsCollection
<div class="input" style="">
Fuel Location Type<br />
<html:select name="fuelForm" property="fuelLocTypeRecId" styleId="fuelLocTypeRecId" styleClass="stdtext" title="FUEL_LOC_TYPE_REC_ID">
<%--<html:optionsCollection name="fuelForm" property="fuelLocTypeList" value="recId" label="descr" />--%>
<c:forEach items="${fuelForm.fuelLocTypeList}" var="item" varStatus="status">
<html:option value="${item.recId}">${item.idx}-${item.descr}</html:option>
</c:forEach>
</html:select>
</div>
Or with an array of String[] only and not an array of beans
<html:select name="invForm" property="inPartNd" size="1" styleClass="stdtextLeft75" >
<html:options name="invForm" property="partFamilyArray"/>
</html:select>
To print a stack trace out to your JSP page, you need to wrap the implicit object 'out' in a printWriter and pass the object to the printStackTrace method in Exception. ie:
<% // JSP scriptlet
try{ // An Exception is throw
%>
Your JSP Body
<%
}catch(Exception e){
e.printStacktrace(new java.io.PrintWriter(out));
}
%>
Access request parameter
<c:out value=”param.nameOfParameter” />
Access request attribute
<c:out value="${requestScope['javax.servlet.forward.servlet_path']}"/>
Example
<c:set var="requestUri" value="${requestScope['javax.servlet.forward.servlet_path']}?includeJsp=${invForm.includeJsp}"/>
You want to access something in the HttpServletRequest implicit request object that is not a parameter or an attribute but has a getter method
<c:out value = "${pageContext.request.queryString}" />
<c:out value = "${pageContext.request.requestURI}" />
Iterate Over List(Collection)
<c:forEach var="resultsVal" items="${results}" varStatus="status">
<tr class="${((status.count % 2) == 0) ? 'resultseven' : 'resultsodd'}">
<td nowrap='true' width='1%' height='1%'>
<a href='#' class='results'>
<c:out value="${resultsVal.property1}"/>
</a>
</td>
<td width='100%' height='1%'>
<c:out value="${resultsVal.property2}"/>
</td>
</tr>
</c:forEach>
Iterate Over Hashmap
Say the hashmap is stored in requestScope
<c:forEach var="resultsVal" items="${results}" varStatus="status">
<tr class="${((status.count % 2) == 0) ? 'resultseven' : 'resultsodd'}">
<td nowrap='true' width='1%' height='1%'>
<a href='#' class='results'>
<c:out value="${resultsVal.key}"/>
</a>
</td>
<td width='100%' height='1%'>
<c:out value="${resultsVal.value}"/>
</td>
</tr>
</c:forEach>
Struts Form Variable with LinkedHashMap
<tr>
<td class="labelBlack" height="1%" width="100px">Removal code</td>
<td height="1%">
<html:select property="reportRemovalCode" styleClass="stdtext">
<html:option value="ALL">ALL</html:option>
<html:optionsCollection property="mxrotremMap" value="key" label="value"/>
</html:select>
</td>
</tr>
Date Input
Must include calendar.jsp in pageheader.jsp
<jsp:include page="/include/calendar.jsp" />
<html:text property="dispatchCmtdte" styleId="dispatchCmtdte" styleClass="stdtext10char" maxlength="10" onblur="needToConfirm=false;ckDate(this);" title="Commit Date"/>
<html:img page="/images/btn_calendar.png" alt="Date Selector"
styleId="AR_anchorDispatchCmtdte" title="Date Selector"/>
<script type="text/javascript">
Calendar.setup({
inputField : "dispatchCmtdte", // id of the input field
button : "AR_anchorDispatchCmtdte" // trigger for the calendar (button ID)
});
</script>
Time Input (in military format from 0000 – 2359, similar to legacy) right now using the ckTime function from the php library and this is the format its expecting if we need to change this let’s discuss
<html:text property="dispatchCmttme" styleId="dispatchCmttme" styleClass="stdtext" onblur="ckTime(this,'24');" title="Commit Time"/>
Printout request values and such in a jsp
<c:import url="/debug.jsp" />
debug.jsp
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn"%>
<%@ page import="com.cms.common.action.RequestUtil" %>
<c:if test="${fn:contains(pageContext.request.serverName, 'localhost')}">
<a class="hdrText" style="font-size: 12px;" onclick="toggle('debug');"
href="#" title="View Debug Information">
View Debug Information -- only visible on localhost
</a>
<div id="debug" class="labelBlack" style="width:95%;display:none;">
<%=RequestUtil.getSummary(request)%>
</div>
</c:if>
Include a file
--included inline
<%@ include file="/transactions/displayTagTransactionDetailLink.jsp" %>
<c:import url="/transactions/displayTagTransactionDetailLink.jsp" />
--as its own servlet
<jsp:include page="/transactions/loan.jsp" />
Setting up selected menus based on Request Url (Servlet Path)
<table border="0" width='100%' height='1%' style="width:150px;margin: 0px 0px 0px 0px;" cellpadding='0px' cellspacing='0px'>
<tr>
<c:choose>
<c:when test="${fn:contains(requestScope['javax.servlet.forward.servlet_path'], 'createCountSheets')}">
<c:set var="createCountSheetsClass" value="menuSelected" />
</c:when>
<c:otherwise>
<c:set var="createCountSheetsClass" value="menuNotSelected" />
</c:otherwise>
</c:choose>
<td class="${createCountSheetsClass}" id='createCountSheetsMenu' style="width:150px;" onclick="window.location='createCountSheets.do';" >
Create Count Sheets
</td>
</tr>
</table>