Using the Nested Tag Library

---

To use the Nested Tag Library in a Struts application, you need to include the following snippet in your Web Archive (.war) deployment descriptor, web.xml:

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

Recall from the overview of the web.xml file in Chapter 2 that <taglib-uri> is used to declare the URI (or alias) that will be referenced in each of your JSPs with a taglib directive. The <taglib-location> tag declares the actual location of the Tag Library Descriptor (.tld) file in your Web Archive.

The following snippet illustrates how your JSPs will declare their use of the Nested Tag Library with a JSP taglib directive:

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

Notice that the uri attribute specified here is the same as that declared with the <taglib-uri> tag in the web.xml file. Also, notice that the prefix attribute is set to “nested”. This attribute can be set to whatever you want; however, “nested” is the accepted default for the Nested Tag Library. The prefix attribute declares the prefix that each tag must have when it is used in the JSP, as shown here:

<nested:nest property="results">

Because “nested” was defined as the prefix, the nest tag was used as shown. However, if you choose to use a prefix of “strutsnest”, the tag would be used as follows:

<strutsnest:nest property="results">

---