Chapter 18: The Logic Tag Library

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The focus of the Logic tag library is on decision making and object evaluation. This taglib contains 14 tags that can be used in a Struts application. In this chapter, we introduce you to each of these tags and show you how to use them.

Installing the Logic Tags

To use the Logic tag library in a Web application, you must complete the following steps. Be sure to replace the value webappname with the name of the Web application that will be using this library:

  1. Copy the TLD packaged with this tag library, struts-logic.tld, to the <CATALINA_HOME>/webapps/webappname/WEB-INF/ directory.

  2. Make sure that the struts.jar file is in the <CATALINA_HOME>/webapps/webappname/WEB-INF/lib directory.

  3. Add the following <taglib> subelement to the web.xml file of the Web application:

     <taglib>   <taglib-uri>/WEB-INF/struts-logic.tld</taglib-uri>   <taglib-location>/WEB-INF/struts-logic.tld</ taglib-location> </taglib> 

You must add the following taglib directive to each JSP that will leverage the Logic tag library:

 <%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" %> 

This directive identifies the URI defined in the previously listed <taglib> element and states that all Logic tags should be prefixed with the string logic.



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Professional Jakarta Struts
Professional Jakarta Struts (Programmer to Programmer)
ISBN: 0764544373
EAN: 2147483647
Year: 2003
Pages: 183

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