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Struts

Iteration in structs

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posted 17 years ago

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Hi,
We can iterate a collection or array using iterate tag of struts. But my requirement is bit different. I have an integer variable and i want to execute a loop that much of time.

ie Let I had a variable stud = 5
I want to print 5 textboxes ie according to the value of stud.
Is there any way using struts tag or I need to add a normal for loop in scriplets?

Also which is the efficient way to take values from these dynamic textboxes?

Thanks inb Advacne.

Vani Bandargal

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posted 17 years ago

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you can use jstl tags like this
<c:forEach var="i" begin="1" end="5">

</c:forEach>

also use indexed properties for your text box.

Jobin Mathew

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posted 17 years ago

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ok the tag you given is working,
but one doubt, how can i acces the counter variable of this loop.
I tries the following, but doesn't work

<c:forEach var="i" begin="1" end="5">
Iteration <%=i%>
</c:forEach>

Merrill Higginson

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posted 17 years ago

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You do it like this:

Note: if you're using a Servlet 2.4 containter (such as Tomcat 5) you can just specify ${status.index} without the enclosing <c:out> tag.
[ February 08, 2007: Message edited by: Merrill Higginson ]

Merrill
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Jobin Mathew

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posted 17 years ago

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This is giving output as

Iteration ${status.index} Iteration ${status.index} Iteration ${status.index} Iteration ${status.index} Iteration ${status.index}

Merrill Higginson

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This is most likely because you haven't configured your web application as a Servlet 2.4 application. Check which XML Schema you reference in your web.xml file.

The easy way to fix this is just to leave your application at Servlet 2.3 and use the <c:out> tag.

If you want to upgrade your application to Servlet 2.4, there's More information on what to do at this link. Since you will be using a different version of JSTL, you will also need to change your taglib definitions as per this link. This link also directs you to where you can download the JSTL 2.0 jars if you need them.
[ February 09, 2007: Message edited by: Merrill Higginson ]

Merrill
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Jobin Mathew

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posted 17 years ago

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Yes, I used <c

ut> tag.

<c:forEach varStatus="status" begin="1" end="5">
Iteration <c

ut value="${status.index}" />
</c:forEach>

But result is
Iteration ${status.index} Iteration ${status.index} Iteration ${status.index} Iteration ${status.index} Iteration ${status.index}

Merrill Higginson

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posted 17 years ago

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I don't know what to tell you, except that you're obviously doing something wrong. Did you remeber to include the taglib definition?

The only other thing I can think of is that maybe your JSTL jar files are old or bad. Try re-downloading them. One of my previous posts has the link.

I just put together a quick JSP and put it in a Servlet 2.4 application:

When I run it, here's the output I get:

Index demo

0
1
2
3
4
[ February 12, 2007: Message edited by: Merrill Higginson ]

Merrill
Consultant, Sima Solutions

Jobin Mathew

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posted 17 years ago

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I tried the code given by you. But I am getting
${status.index}
${status.index}
${status.index}
${status.index}
${status.index}

So I think this is the mistake in my web.xml.

Can you specify the changes I need in my web.xml.

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
                         "http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
 <display-name>Test</display-name>
 <servlet>
  <servlet-name>action</servlet-name>
  <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
  <init-param>
   <param-name>config</param-name>
   <param-value>/WEB-INF/struts-config.xml</param-value>
  </init-param>
  <load-on-startup>1</load-on-startup>
 </servlet>
 <servlet-mapping>
  <servlet-name>action</servlet-name>
  <url-pattern>*.do</url-pattern>
 </servlet-mapping>
 <welcome-file-list>
  <welcome-file>index.jsp</welcome-file>
 </welcome-file-list>
 <taglib>
  <taglib-uri>/WEB-INF/struts-bean</taglib-uri>
  <taglib-location>/WEB-INF/struts-bean.tld</taglib-location>
 </taglib>
 <taglib>
  <taglib-uri>/WEB-INF/struts-logic</taglib-uri>
  <taglib-location>/WEB-INF/struts-logic.tld</taglib-location>
 </taglib>
 <taglib>
  <taglib-uri>/WEB-INF/struts-html</taglib-uri>
  <taglib-location>/WEB-INF/struts-html.tld</taglib-location>
 </taglib>
</web-app>

Merrill Higginson

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posted 17 years ago

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This link explains how to modify your web.xml file. Don't forget that in a Servlet 2.4 web.xml, the <taglib></taglib> tags must all be enclosed in a single <jsp-config></jsp-config> stanza.

Merrill
Consultant, Sima Solutions

Jobin Mathew

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posted 17 years ago

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I edit my web.xml as it is given in the link.
Also give <taglib> tag inside <jsp-config>

But still the same thing happens.
I am using tomcat 5.
Is there any need of additional or new versions of jar files.

Vani Bandargal

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posted 17 years ago

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can you try this:

<c

ut value="${status.count}" />

[ February 13, 2007: Message edited by: Vani D Bandargal ]
[ February 13, 2007: Message edited by: Vani D Bandargal ]

Jobin Mathew

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posted 17 years ago

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Thanks, It worked.

What is the difference between status.index & status.count?

Merrill Higginson

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posted 17 years ago

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Now that you know the basics, I'd say it's time to down load the JSTL 1.1 Specification and read about the fine points yourself.

Merrill
Consultant, Sima Solutions

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