Question

b) Explain with the help of an example/diagram or write code for the
following using JSP:

a) b) Need of Directives in JSP with the help of taglib directive.

Accepted Answer

The JavaServer Pages API allow you to define custom JSP tags that look like HTML or XML tags and a tag library is a set of user-defined tags that implement custom behavior.

The taglib directive declares that your JSP page uses a set of custom tags, identifies the location of the library, and provides means for identifying the custom tags in your JSP page.

The taglib directive follows the syntax given below

<%@ taglib uri = "uri" prefix = "prefixOfTag" >

Where, the uri attribute value resolves to a location the container understands and the prefix attribute informs a container what bits of markup are custom actions.

You can write the XML equivalent of the above syntax as follows

<jsp:directive.taglib uri = "uri" prefix = "prefixOfTag" />

When you use a custom tag, it is typically of the form <prefix:tagname>. The prefix is the same as the prefix you specify in the taglib directive, and the tagname is the name of a tag implemented in the tag library.

For example, suppose the custlib tag library contains a tag called hello. If you wanted to use the hello tag with a prefix of mytag, your tag would be <mytag:hello> and it will be used in your JSP file as follows

<%@ taglib uri = "http://www.example.com/custlib" prefix = "mytag" %>

<html>
   <body>
      <mytag:hello/>
   </body>
</html>

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