How to compare 2 list values in JSP: jsp.jstl

by: rrz@871311Posted on 2009-10-02 at 08:27:17ID: 25478835

I dont understand. It looks like you have only one list. They are both called checkReportingLevel. You need two different identifiers.

by: dravidnsrPosted on 2009-10-02 at 08:53:22ID: 25479081

sorry

List<String> reportingLevelAccess = papaUserManagementInter.getReportingLevelAccess();
is return [JPN, CHN, IND, 2155, APAC, US, UK, EU, CFMA, AND, ANDP, GLOBE, FTSI]

List<String> checkReportingLevel=papaUserManagementInter.checkReportLevel(user);

it return [IND,FTSI]

i worte like this !! 
 
<form:select path="accessType" multiple="true"> 
                                                                        <c:forEach var="reportingLevel" items="${reportingLevel}">
                                                                                <form:option value="${reportingLevel}" <c:if test="${(reportingLevel)==slecectedMap}">selected</c:if>> ${reportingLevel}</form:option>
                                                                                </c:forEach> 
                                                                        </form:select>
but it says error ??
what is the error in my code !!

1:
2:
3:
4:
5:
6:
7:
8:
9:

Select all Open in new window

by: rrz@871311Posted on 2009-10-02 at 09:04:54ID: 25479218

Your forEach tag still doesn't make sense. The var and the items attributes will have to have different identifiers. Maybe something like
<c:forEach var="current" items="${reportingLevel}">
<form:option value="${current}" <c:if test="${current == slecectedMap}">selected</c:if>> ${current}</form:option>
</c:forEach>

Also give us more details. How do you want to compare the lists ?

by: dravidnsrPosted on 2009-10-02 at 09:08:34ID: 25479258

if the page load time the display list will be selected !!

by: dravidnsrPosted on 2009-10-02 at 09:09:31ID: 25479267

slecectedMap is in seesion ... if i omapre the list value if both are same means i want to select !!

how can i do that !!

by: rrz@871311Posted on 2009-10-02 at 09:51:42ID: 25479655

I have to work on my profect today. If you explain more clearly, then maybe an expert will help you.
You have two lists (reportingLevelAccess and checkReportingLevel) and a map (slecectedMap)
I will be back tonight.

by: dravidnsrPosted on 2009-10-02 at 10:36:43ID: 25480053

I have to list checkReportingLevel is setted in session named as slecectedMap bcz i want to compared the value with reportingLevelAccess as in that drop down !!

if both or equal the it will selected when the page load !!

Thanks have a nice day !!

by: rrz@871311Posted on 2009-10-03 at 09:10:16ID: 25485838

slecectedMap is really a list ? Ok, but confusing.
>i want to compared the value with reportingLevelAccess
You will have to do that in a scriptlet or a custom EL function.
You can use
boolean isEqual = reportingLevel.equals(slecectedMap);
For reference on EL custom function, see
http://www.experts-exchange.com/Programming/Languages/Java/J2EE/JSP/Q_24701502.html
If you want to create a custom EL function and need help, then tell me.

In standard EL you could just compare the length of the two lists.
<%@taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn"%>
...
<c:if test="${fn:length(reportingLevel) == fn:length(slecectedMap)}">selected</c:if>

by: dravidnsrPosted on 2009-10-03 at 11:18:25ID: 25486257

reportingLevel is dropdown which is multiple selection possible
it reurn [JPN, CHN, IND, 2155, APAC, US, UK, EU, CFMA, AND, ANDP, GLOBE, FTSI]

slecectedMap value is same values present in reportingLevel but some value only
[IND,FTSI]

in jsp

i want to select the IND ,FTSI as defult while page load how can i do that !!

by: dravidnsrPosted on 2009-10-03 at 11:21:22ID: 25486275

<<<< If you want to create a custom EL function and need help, then tell me.

s i need can u help me ??

by: rrz@871311Posted on 2009-10-04 at 09:26:44ID: 25489640

>i want to select the IND ,FTSI as defult while page load how can i do that !!
I wrote a test page to demonstrate. I tested it. It uses a custom EL function. Please read
http://www.experts-exchange.com/Programming/Languages/Java/J2EE/JSP/Q_24701502.html
for reference.

<%@ page import="java.util.*" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> 
<%@taglib prefix="my" uri="/WEB-INF/myFunctions.tld" %> 
<%
List reportingLevel = new ArrayList();
reportingLevel.add("JPN");
reportingLevel.add("CHN");
reportingLevel.add("IND");
reportingLevel.add("2155");
reportingLevel.add("APAC");
reportingLevel.add("US");
reportingLevel.add("UK");
reportingLevel.add("EU");
reportingLevel.add("CFMA");
reportingLevel.add("AND");
reportingLevel.add("ANDP");
reportingLevel.add("GLOBE");
reportingLevel.add("FTSI");
List slecectedMap = new ArrayList();
slecectedMap.add("IND");
slecectedMap.add("FTSI");
%>
<c:set var="reportingLevel" value="<%=reportingLevel%>" />
<c:set var="slecectedMap" value="<%=slecectedMap%>" />
<html>
<body>
<form>
<select multiple="multiple">
 <c:forEach var="current" items="${reportingLevel}">
       <option value="${current}" 
            <c:if test="${my:contains(current,slecectedMap)}">
                  selected="selected"
            </c:if>> 
            ${current}
       </option>
 </c:forEach> 
</select>
</form>
</body>
</html>
---------------------------------------------------------------------------
myFunctions.tld
-------------------------------------------------------
<?xml version="1.0" encoding="ISO-8859-1" ?>
 
<taglib
    xsi:schemaLocation=
    "http://java.sun.com/xml/ns/javaee web-
        jsptaglibrary_2_1.xsd"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    version="2.1" >
  <tlibversion>1.1</tlibversion>
  <function>
    <name>contains</name>
    <function-class>rrz.Contains</function-class>
    <function-signature>
        boolean contains(java.lang.String,java.util.ArrayList)
    </function-signature>
  </function>
</taglib>
------------------------------------------------------------------------
Contains.java
--------------------------------
package rrz;
import java.util.ArrayList;
public class Contains {
  public static boolean contains( String element, ArrayList list) {
        return list.contains(element);
  }
}

1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:
21:
22:
23:
24:
25:
26:
27:
28:
29:
30:
31:
32:
33:
34:
35:
36:
37:
38:
39:
40:
41:
42:
43:
44:
45:
46:
47:
48:
49:
50:
51:
52:
53:
54:
55:
56:
57:
58:
59:
60:
61:
62:
63:
64:
65:
66:
67:
68:
69:
70:
71:

Select all Open in new window

by: dravidnsrPosted on 2009-10-06 at 23:25:47ID: 31636307

Gd Solution ...

thanks for ur help !!

Question

How to compare 2 list values in JSP

Subscribe now for full access to Experts Exchange and get

Instant Access to this Solution

jsp.jstl

Java Standard Tag Library (JSTL) & Server Tags

Java Server Pages (JSP)

Trusted by hundreds of thousands everyday for fast, accurate and reliable tech support.

See what Experts Exchange can do for you.

Got a question?

We've got the answer.

Need individual assistance?

Our experts are ready to help.

Want to learn from the best?

Read articles from industry experts.

Working on a long term project?

Store your work and research.

What Makes Experts Exchange Unique?

Trusted by the world's most respected brands.

Faithfully serving IT professionals since 1996.

Related Solutions

Free Tech Articles

Cloud Class Webinars

Join the Community

Give a Little. Get a Lot.

Answers

3 Ways to Join

The Experts

The Experts

Testimonials

Testimonials

Testimonials

Business Clients

Business Clients

In the Press

In the Press

In the Press