jsp Iterate tag

Hi all

Is there some kind of jsp itereate tag similar to the struts iterate tag that would allow me to loop through a list of objects and output the data in table rows? My new project does not use Struts and i don't want to have to use scriplets in my jsp page.

Thanks,

AMD

Within JSTL (Java Standard Tag Library) there is the forEach tag.

A link to the JSTL specification is available in the JSP FAQ.

Thanks guys

So do you think that would work well with this situation.

I have an array of user objects that contain stuff like first name, last name ...

I am setting that array on a userBean. I am then going to use jsp:useBean and jsp:getProperty to get a hold of my array of user objects. I then want to use the JSTL iterate tag to go through the array and print out all the users to a table row by row.

Sound good?

Thanks,

AMD

Yuppers, except that instead of getProperty I'd use the more moders EL/JSTL approach to retrieve the property values.

By the way, what version of JSP are you on?
[ August 24, 2006: Message edited by: Bear Bibeault ]

Hi Bear,

I think 1.2. Do I have to copy those jars to my project lib or can I use them since they are installed on my web server. I am using Jboss.

Thanks,

AMD

They're probably not pre-installed with the Tomcat instance that JBoss is using.

If you can, I'd highly recommend upgrading to a JSP 2.0 version.

Be sure you obtain the right version of JSTL for your version of JSP. It's all covered in the JSP FAQ.

Ok I looked closer. I am using the Tomcat 5.5, which I think has the the 2.0 container. I got the 1.1 JSLT jars and installed them in my projects lib. Now do I have to add something to the web.xml? Right now it is not working, I poked around online and it seemed some people were added stuff to web.xml. Any thoughts?

Thanks,

AMD

What do you mean by "not working"? You don't need to add anything in the web.xml but you do need to add the taglib declarations in your JSP file(s). This is also in the JSP Faq.

Sorry "not working" means I tried this test

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

Setting the value: "Hello World!"
<c:set var="hello" value="Hello World!"/>
<p/>
<c

ut value="${hello}"/>

The output is $(hello) I get a warning in Eclipse saying unknow tag c

ut. I think I have the correct jars because previoulsy I was just getting a blank page.

Thanks,

AMD

Originally posted by Andrew Mcmurray:
I poked around online and it seemed some people were added stuff to web.xml.

Gregg is correct; no web.xml dickering necessary.

Your online research reveals that most people don't know that and, quite incorrectly, think that they need to extract the TLD files from the jar files, put them in WEB-INF, and then place elements in the web.xml to reference them. This is not necessary and will just lead to problems later on down the road. Don't do it.
[ August 24, 2006: Message edited by: Bear Bibeault ]

If you are using JSTL 1.1, the correct syntax is:

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

Which can be copy and pasted from...you guessed it, the JSP Faq. ;)

Ok thanks Greg, I think I am getting close. I didn't think the order mattered with the prefix and uri. So now Eclipse recognizes the tags, but the output is still the same as above just ${hello} instead of the var value. Any thoughts?

Thanks,

AMD

Is your web.xml configured as a servlets 2.3. or 2.4 web application? (Covered in JSP FAQ, as per usual).

Hmm, not too sure. It works fine for me. You have the jstl.jar and standard.jar in the WEB-INF/lib folder?

Originally posted by Bear Bibeault:
Is your web.xml configured as a servlets 2.3. or 2.4 web application? (Covered in JSP FAQ, as per usual).

Ahhh. I bet that is more likely it.

Hi Bear,

My web.xml says Web Application 2.3.

<imagine a game show buzzer going off>

If so, you have effectively disabled all JSP 2.0 features in your application.

Fix it as described in the JSP FAQ.

Hi Bear,

I looked through the faq, I am not sure if I am looking in the right spot, but from what I found I got the wrong version of the JSTL jars? I should of got the 1.0 instead of the 1.1 ones?

Thanks,

AMD

No, you need the 1.1 jars but you need to change your web.xml to be for 2.4.

See here and copy and paste. ;)

NO

Why are you making things os hard on yourself. Just set up your web.xml properly an be done with it.

BONK

I've added a new entry to the JSP FAQ that gathers the steps to set up the JSTL 1.1 for JSP 2.0 in one place.

I also removed some older JSTL entries that just seemed to be confusing people.

Thanks Gregg and Bear

After I switched the web.xml it worked!

AMD