I copied this out of the documentation of the BodyTagSupport class'
doAfterBody method...
"Actions after some body has been evaluated. Not invoked in empty tags or in
tags returning SKIP_BODY in doStartTag() This method is invoked after every
body evaluation. The pair "BODY -- doAfterBody()" is invoked initially if
doStartTag() returned EVAL_BODY_TAG, and it is repeated as long as the
doAfterBody() evaluation returns EVAL_BODY_TAG"
So, it seems that the pair "BODY -- doAfterBody()" will be invoked so long
as doAfterBody returns EVAL_BODY_TAG, and in my example, it does execute the
correct number of times (5 in my case, one for each String object in the
collection). The only issue is that it's not actually executing the JSP
code inside the tag. It's iterating correctly, but not actually doing the
work inside the body of the tag. Has anyone else seen this?
-----Original Message-----
From: Jeff Turner [mailto:[EMAIL PROTECTED]]
Sent: Saturday, December 09, 2000 10:43 PM
To: [EMAIL PROTECTED]; [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Subject: Re: JSP bodycontent?
On Sat, 9 Dec 2000, James Carman wrote:
> Does Tomcat support the JSP body content for a BodyTag? In my doAfterBody
> method (inherited from BodyTagSupport), I return EVAL_BODY_TAG. I have
some
You must return EVAL_BODY_TAG in your doStartTag() method, not
doAfterBody(). Have a look at the jakarta-taglibs project for some nice
examples, in particular
/utility/src/org/apache/taglibs/utility/basic/IncludeTag.java
As an aside, I noticed that JRun does not comply with the spec and call
setBodyContent on empty tags like <util:include url="foo.html"/>. You have
to trick it by saying <util:include url="foo.html"></util:include>. This
means that some jakarta-taglibs taglibs won't work under JRun. This isn't
fixed in SP1, so watch out for it if you ever have to port to JRun.
--Jeff
> debug statements in my code, so I can see that the doAfterBody method is
> called multiple times, but I'm not seeing the html that should be
generated
> by my JSP code within the tag's body. Can somebody help me?
>
> ************************************************
> Here's my Java code...
>
> package ws.carman.taglib;
>
> import javax.servlet.jsp.tagext.BodyTagSupport;
> import java.util.Iterator;
> import java.util.Collection;
> import javax.servlet.ServletRequest;
>
> public class IterateTag extends BodyTagSupport
> {
> private String m_CollectionName;
> private String m_ElementName;
> private Iterator m_Iterator;
>
> public final void setCollectionName( final String newCollectionName )
> {
> m_CollectionName = newCollectionName;
> }
>
> public final void setElementName( final String newElementName )
> {
> m_ElementName = newElementName;
> }
>
> public final int doStartTag()
> {
> final ServletRequest request = pageContext.getRequest();
> final Collection coll = ( Collection )request.getAttribute(
> m_CollectionName );
> m_Iterator = coll.iterator();
> return doNext();
> }
>
> public final int doAfterBody()
> {
> System.out.println( "Inside doAfterBody!" );
> return doNext();
> }
>
> private final int doNext()
> {
> if( m_Iterator.hasNext() )
> {
> pageContext.getRequest().setAttribute( m_ElementName,
> m_Iterator.next() );
> System.out.println( "Current element is " +
> pageContext.getRequest().getAttribute( m_ElementName ) );
> return EVAL_BODY_TAG;
> }
> else
> {
> return SKIP_BODY;
> }
> }
>
> public void release()
> {
> m_ElementName = null;
> m_CollectionName = null;
> m_Iterator = null;
> }
> }
>
> *********************************************************
> Here's the tag library descriptor file...
>
> <?xml version="1.0" encoding="ISO-8859-1" ?>
> <!DOCTYPE taglib
> PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.1//EN"
> "http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1.dtd">
>
> <!-- a tag library descriptor -->
>
> <taglib>
> <tlibversion>1.0</tlibversion>
> <jspversion>1.1</jspversion>
> <shortname>carman</shortname>
> <uri></uri>
> <info></info>
> <bodycontent>JSP</bodycontent>
> <tag>
> <name>iterate</name>
> <tagclass>ws.carman.taglib.IterateTag</tagclass>
> <info>Iterates throug a named collection</info>
>
>
> <attribute>
> <name>collectionName</name>
> <required>true</required>
> </attribute>
>
> <attribute>
> <name>elementName</name>
> <required>true</required>
> </attribute>
> </tag>
> </taglib>
>
> ***********************************************************
> And finally, here's my JSP...
>
> <HTML>
> <HEAD>
> <TITLE>Iterator Example</TITLE>
> </HEAD>
> <%@ page import="java.util.*" %>
> <%@ taglib uri="taglib/iterate.tld" prefix="carman" %>
>
> <%
> final String[] listElements = new String[] { "Hello", "World", "How",
> "Are", "You" };
> final List list = Arrays.asList( listElements );
> request.setAttribute( "list", list );
> %>
> <BODY>
> Before Tag!<BR>
> <carman:iterate collectionName="list" elementName="element">
> The current element is <%=request.getAttribute( "element" )%><BR>
> </carman:iterate>
> After Tag!<BR>
> </BODY>
> </HTML>
>
