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<?xml version="1.0"?>
<!--
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements. See the NOTICE file
distributed with this work for additional information
regarding copyright ownership. The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied. See the License for the
specific language governing permissions and limitations
under the License.
-->
<document>
<properties>
<title>VelocityViewTag</title>
<projectfile>xdocs/project.xml</projectfile>
<subprojectfile>xdocs/view.project.xml</subprojectfile>
</properties>
<body>
<section name="Overview">
<p class="note">
This page is still unfinished. For details on configuring
the VelocityViewTag, you can follow most of the instructions
for the <a href="view.servlet.html">VelocityViewServlet</a>
and of course on the <a href="config.html">configuration pages</a>.
<a href="index.html#Contribution">Help finishing this is welcome!</a>
</p>
<p>
This is a JSP tag that allows you to use Velocity and VelocityTools
from within a JSP page or tag. There are many ways to use this tag.
This simplest is to have it process an external template using the
current page context. Assuming you have a template called "foo.vm"
that can be found by your resource loader(s) that looks like this:
</p>
<sourcecode>
Hello $!bodyContent World!
</sourcecode>
<p>
This tag can process that template by doing:
</p>
<sourcecode>
<%@taglib prefix="velocity" uri="http://velocity.apache.org/velocity-view" %>
<velocity:view template="foo.vm"/>
</sourcecode>
<p>
VTL in the body of the tag:
</p>
<sourcecode>
<%@taglib prefix="velocity" uri="http://velocity.apache.org/velocity-view" %>
<velocity:view>
#if( $date.E eq 'Friday' )
Happy
#else
Sad
#end
</velocity:view>
</sourcecode>
<p>
or combine both by first processing the body of the tag, then
inserting the results of that into the context for the separate
template as $bodyContent:
</p>
<sourcecode>
<%@taglib prefix="velocity" uri="http://velocity.apache.org/velocity-view" %>
<velocity:view template="foo.vm">
#if( $date.E eq 'Friday' )
Happy
#else
Sad
#end
</velocity:view>
</sourcecode>
<p>
You can also store the results of any of the options above into
a variable of any name and scope (default scope is "page"):
</p>
<sourcecode>
<%@taglib prefix="velocity" uri="http://velocity.apache.org/velocity-view" %>
<velocity:view var="foo" scope="request" template="foo.vm">
#if( $date.E eq 'Friday' )
Happy
#else
Sad
#end
</velocity:view>
</sourcecode>
<p>
For more details, see the
<a href="javadoc/org/apache/velocity/tools/view/jsp/VelocityViewTag.html">Javadoc</a>
or the
<a href="http://svn.apache.org/repos/asf/velocity/tools/trunk/src/main/java/META-INF/velocity-view.tld">TLD</a>.
</p>
</section>
</body>
</document>
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