JSTL forEach with arrayList

[13年前 に marc henry によって更新されました。]

Hello,

I've got trouble while trying to use <c:forEach> JSTL Tag in my JSP.

Here is a sample source code I made to test the forEach tag :

<%@page import="java.sql.ResultSetMetaData"%>
<%@page import="java.sql.ResultSet"%>
<%@page import="java.util.*" %>
<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>


<%@ page import="javax.portlet.*"%>
<%@ taglib uri="http://java.sun.com/portlet_2_0" prefix="portlet"%>

<portlet:defineobjects />
&lt;%PortletPreferences prefs = renderRequest.getPreferences();%&gt;

&lt;%@ taglib uri="http://liferay.com/tld/ui" prefix="liferay-ui" %&gt;
&lt;%@ taglib uri="http://java.sun.com/jstl/core_rt" prefix="c"%&gt;


<b>
    DBPagePortlet - view MODE 
</b>

&lt;%

	ArrayList<integer> myList =  new ArrayList<integer>();
	int x=10,j=20,k=30;
	myList.add(x);
	myList.add(j);
	myList.add(k);
	
	
%&gt;

<c:foreach var="myValue" items="${myList}">
${myValue} 

</c:foreach>

</integer></integer>

And all I have got is ${myValue} displayed on the screen but not the values I want !

Moreover, ${myValue} is displayed only one time, not three which means that the loop does not run good...

Please help,

Thanks

[13年前 に Tina Agrawal によって更新されました。]

Hi,

A few things that you need to do -
1) Did you make the entry in web.xml?
2) You need to use c:out tag to display the value.
3) Set the Arraylist in your Java code and then set it in request object.

Regards,
Tina

[13年前 に Felipe Sere によって更新されました。]

Tina Agrawal:

Hi,

A few things that you need to do -
1) Did you make the entry in web.xml?
2) You need to use c:out tag to display the value.
3) Set the Arraylist in your Java code and then set it in request object.

Regards,
Tina

Hi Tina,

I am also fighting with JSTL (and I am quite new to it) and I was wondering what you meant with "making an entry in web.xml". Can you post an example?

Felipe

[13年前 に Tina Agrawal によって更新されました。]

Hi Felipe,

Your web.xml shall have the taglib defined.
Example -

<taglib>
		<taglib-uri>http://java.sun.com/jstl/core_rt</taglib-uri>
		<taglib-location>/WEB-INF/tld/c-rt.tld</taglib-location>
</taglib>

Regards,
Tina

[12年前 に Mohamed Rizwanuzaman によって更新されました。]

Hi Tina,
I had tried to use the jstl tag for looping a list.
this is my code

List<employee> employeeList = DepartmentLocalServiceUtil.getDepartmentEmployees(departmentId);
<c:foreach var="myValue" items="${employeeList}">
<c:out value="${myValue.employeeName}"></c:out>
</c:foreach>
</employee>

And i have include the c.tld and jstl.jar in liferay-plugin-package.properties but its not working ,
Below is the error i facing

13:13:57,455 ERROR [render_portlet_jsp:154] org.apache.jasper.JasperException: /view.jsp (line: 42, column: 0) According to TLD or attribute directive
in tag file, attribute items does not accept any expressions
        at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:42)
        at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:408)
        at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:149)
        at org.apache.jasper.compiler.Validator$ValidateVisitor.checkXmlAttributes(Validator.java:1235)
        at org.apache.jasper.compiler.Validator$ValidateVisitor.visit(Validator.java:870)
        at org.apache.jasper.compiler.Node$CustomTag.accept(Node.java:1539)
        at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376)
        at org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2428)
        at org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2434)
        at org.apache.jasper.compiler.Node$Root.accept(Node.java:475)
        at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376)
        at org.apache.jasper.compiler.Validator.validateExDirectives(Validator.java:1790)
        at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:217)
        at org.apache.jasper.compiler.Compiler.compile(Compiler.java:373)
        at org.apache.jasper.compiler.Compiler.compile(Compiler.java:353)
        at org.apache.jasper.compiler.Compiler.compile(Compiler.java:340)
        at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:646)
        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:357)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)

Its highly appreciable if anyone help to solve this issue.

Regards,
Rizwan

[13年前 に Gaurang Sheladia によって更新されました。]

Hi Marc,

You have used core_rt library for iterating the for loop.

Can you please replace

<%@ taglib uri="http://java.sun.com/jstl/core_rt" prefix="c"%>

with the following line

<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c"%>

In JSTL Core library has function to iterate for loop.

Hope it help.


Regards,
Gaurang

[12年前 に Tina Agrawal によって更新されました。]

Hi Mohamed ,

Your code is wrong. You cant use java objects like this in JSTL.
You need to set employeeList in the request object from your portlet and then iterate it.

Tina

[6年前 に Sudhanshu Kumar Shukla によって更新されました。]

Thank you Tina
It's Work for me.
I have just added java objects into request object then it is working fine.


Again Thank you So much!!!!!!!!!!!!!