December 2003
Intermediate to advanced
764 pages
24h 58m
English
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Declaring a Custom Tag Library
As you
know by now, a JSP page contains a mixture of JSP elements and
template text, in which the template text can be HTML or XML
elements. The JSP container needs to figure out which is which.
It’s easy for it to recognize the standard JSP
elements (because they all use the jsp namespace
prefix), but it needs some help to find the elements that represent
custom actions. That’s where the tag library
declaration comes into play.
Example 7-1 shows a page that uses a custom action from a custom tag library.
Example 7-1. Custom tag library declaration (message.jsp)
<%@ page contentType="text/html" %>
<%@ taglib prefix="ora" uri="orataglib" %>
<html>
<head>
<title>Messages of the Day</title>
</head>
<body bgcolor="white">
<h1>Messages of the Day</h1>
<h2>Deep Thoughts - by Jack Handey</h2>
<i>
<ora:motd category="thoughts" />
</i>
<h2>Quotes From the Famous and the Unknown</h2>
<i>
<ora:motd category="quotes" />
</i>
</body>
</html>This page displays messages from the same collections as the examples
in Chapter 6. The second directive in Example 7-1 is a taglib directive,
which is used to declare a custom tag library. Now,
let’s see what this really means. In order for the
JSP container to use actions from a tag library, it must be able to
do two things: recognize that an element represents a custom action
from a specific library, and find the Java class or tag file that
implements the custom action logic.
The first requirement—figuring out which library ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.