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Custom Tag in JSP

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Custom Tags in JSP

This tags are user-defined tags and used scriptlet tag .

Custom Tags advantages

Eliminates srciptlet tag .
Separation of business logic for easy to maintain.
Reusability

Syntax

    <prefix:tagname attr1=value1....attrn=valuen />  

    <prefix:tagname attr1=value1....attrn=valuen />

Another way to be used

    <%@ taglib uri="http://java.sun.com/jsp/jstl/core"     
	<prefix:tagname attr1=value1....attrn=valuen >  
    body code  
    </prefix:tagname>  

    <prefix:tagname attr1=value1....attrn=valuen >  
    body code  
    </prefix:tagname>prefix="c" %> First Name:<c:out value="${param.fname}"></c:out><br/>  
    Last Name:<c:out value="${param.lname}"></c:out>  

    <%@ taglib uri="http://java.sun.com/jsp/jstl/core" 
	prefix="c" %> First Name:<c:out value="${param.fname}"></c:out><br/>  
    Last Name:<c:out value="${param.lname}"></c:out>

JSP Custom Tag API

In this tag is used javax.servlet.jsp.tagext package

Example of custom tag with tablib

message.tld

<taglib>
 <tlib-version>1.0</tlib-version>
 <jsp-version>2.0</jsp-version>
 <short-name>My Custom Tag</short-name>
 <tag>
 <name>MyMsg</name>
 <tag-class>beginnersbook.com.Details</tag-class>
 <body-content>empty</body-content>
 </tag>
</taglib>

Using custom tag in JSP : It is created a custom tag named MyMsg and using it.

Note: taglib directive used TLD file path in uri field andv we have created the message.

Custom tag is called like this: <prefix:tagName/>. Our prefix is myprefix and tag name is MyMsg so we have called it as <myprefix:MyMsg/> in the below JSP page.

<%@ taglib prefix="myprefix" uri="WEB-INF/message.tld"%>
<html>
 <head>
    <title>Custom Tags in JSP Example</title>
 </head>
 <body>
    <myprefix:MyMsg/>
 </body>
</html>