December 2003
Intermediate to advanced
764 pages
24h 58m
English
Content preview from JavaServer Pages, 3rd Edition
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Using Actions from a Tag Library
The custom action described in Table 7-1 does exactly the same thing as the second bean used in Chapter 6: it adds a message from a specified category to a page.
Table 7-1. Attributes for <ora:motd>
|
Attribute name |
Java type |
Dynamic value accepted |
Description |
category |
String |
Yes |
Mandatory. The message category, either thoughts or quotes. |
This custom action has one mandatory attribute named
category, used to select the type of message you
want. Let’s get back to the “Java
type” and “Dynamic value
accepted” columns at the end of this chapter.
Example 7-2 shows the message.jsp page again, now with the custom action elements highlighted.
Example 7-2. Custom action elements (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>First note how the <ora:motd> element name
prefix matches the prefix assigned to the custom tag library by the
taglib directive. The syntax for a custom action
element is the same as for standard actions: an opening tag, possibly
with attributes, a body, and a closing tag; or just one tag ending
with /> if no body is used (as in Example 7-2). Standard actions, JSTL actions and custom actions are all ...
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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.